{"id":236,"date":"2022-12-21T14:44:06","date_gmt":"2022-12-21T05:44:06","guid":{"rendered":"https:\/\/supraceramics.jp\/?page_id=236"},"modified":"2022-12-21T14:49:14","modified_gmt":"2022-12-21T05:49:14","slug":"home","status":"publish","type":"page","link":"https:\/\/supraceramics.jp\/","title":{"rendered":"Home"},"content":{"rendered":"\n<div class=\"wp-block-query is-layout-flow wp-block-query-is-layout-flow\"><ul class=\"wp-block-post-template is-layout-flow wp-block-post-template-is-layout-flow\"><li class=\"wp-block-post post-2469 post type-post status-publish format-standard hentry category-event en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/08\/2469\/\" target=\"_self\" >International Conference on Supra-ceramics and Related Materials<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p><a href=\"https:\/\/supraceramics.jp\/international_conference\/\">https:\/\/supraceramics.jp\/international_conference\/<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/08\/2469\/\"><time datetime=\"2026-08-24T08:47:44+09:00\">2026\u5e748\u670824\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/event\/\" rel=\"tag\">Event<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2375 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/05\/2375\/\" target=\"_self\" >Publication | Chem. Commun. (Onda, Maeda et al.) \u201cIntroducing an insulating alumina layer into a molecular photocathode to improve CO2 reduction activity\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Introducing an insulating alumina layer into a molecular photocathode to improve CO2 reduction activity<\/p>\n<p>Yu Takagi, Masaya Yara, Toshiya Tanaka, Jo Onodera, Minato Tanaka, Megumi Okazaki, Kiyoshi Miyata, Ken Onda,* Osamu Ishitani,* Kazuhiko Maeda*<\/p>\n<p>Interfacial engineering with an Al<small><sub>2<\/sub><\/small>O<small><sub>3<\/sub><\/small> overlayer enhances visible-light-driven CO<small><sub>2<\/sub><\/small> reduction on p-type NiO photocathodes incorporating Ru(<small>II<\/small>)-based photosensitizing molecular units. <em>Operando<\/em> transient absorption spectroscopy reveals that Al<small><sub>2<\/sub><\/small>O<small><sub>3<\/sub><\/small> suppresses charge recombination between NiO and the photosensitizer unit, prolonging carrier lifetimes and improving catalytic efficiency.<\/p>\n<p>Chem. Commun. 2026, 62 (32), 8067-8294.<\/p>\n<p><a href=\"https:\/\/doi.org\/10.1039\/D6CC00558F\" rel=\"nofollow\">https:\/\/doi.org\/10.1039\/D6CC00558F<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/05\/2375\/\"><time datetime=\"2026-05-01T14:03:38+09:00\">2026\u5e745\u67081\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2371 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/05\/2371\/\" target=\"_self\" >Publication | Inorg. Chem. (Ishiwari, Tanaka, Maeda et al.) \u201cA Lead(II)-Based Coordination Polymer Exhibiting Photocatalytic and Electrochemical CO2 Reduction Activities\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>A Lead(II)-Based Coordination Polymer Exhibiting Photocatalytic and Electrochemical CO2 Reduction Activities<\/p>\n<p>Chomponoot Suppaso, Yura Jang, Saori Ogura, Ryohei Akiyoshi, Ryuichi Nakada, Megumi Okazaki, Fumitaka Ishiwari, Kazuyoshi Ogasawara, Akinori Saeki, Daisuke Tanaka,* Kazuhiko Maeda*<\/p>\n<p>Mixed-anion compounds incorporating multiple anionic species within a single crystal lattice can exhibit novel structural and functional properties and so have recently attracted much attention. These materials offer unique coordination environments that can lead to emergent behaviors relevant to various applications. Coordination polymers (CPs) comprising metal centers bridged by molecular anionic linkers represent a subclass of mixed-anion compounds and are of interest. In particular, CPs featuring metal\u2013sulfur (\u2212M\u2013S\u2212)<sub><i>n<\/i><\/sub> frameworks are promising candidates for optoelectronic and catalytic applications due to the unique light absorption characteristics of these materials. The present study synthesized and characterized a new visible-light-responsive Pb(II)-based CP, termed <b>STF-1<\/b> (Science Tokyo Framework 1; [Pb(mptt)<sub>2<\/sub>]<sub><i>n<\/i><\/sub>, mptt = 5-mercapto-3-phenyl-1,3,4-thiadiazole-2-thiolate). This CP exhibits an optical bandgap of 2.50 \u00b1 0.2 eV and so is responsive to visible light. <b>STF-1<\/b> also demonstrates charge carrier transport through the mptt ligand moiety, as supported by first-principles density functional theory calculations. Photocatalytic experiments under visible light irradiation established that <b>STF-1<\/b> selectively reduces CO<sub>2<\/sub> to formate with high selectivity and minimal hydrogen evolution. Additionally, <b>STF-1<\/b> shows activity as a pre-electrocatalyst for CO<sub>2<\/sub> conversion in aqueous media.<\/p>\n<p>Inorg. Chem. 2026, 65 (7), 3957-3966.<\/p>\n<p><a href=\"https:\/\/doi.org\/10.1021\/acs.inorgchem.5c05258\" rel=\"nofollow\">https:\/\/doi.org\/10.1021\/acs.inorgchem.5c05258<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/05\/2371\/\"><time datetime=\"2026-05-01T14:01:58+09:00\">2026\u5e745\u67081\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2367 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/05\/2367\/\" target=\"_self\" >Publication | J. Am. Chem. Soc. (Onda, Maeda et al.) \u201cElucidating the Origin of Hidden Limitations in Ru-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts for Visible-Light CO2 Reduction\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Elucidating the Origin of Hidden Limitations in Ru-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts for Visible-Light CO2 Reduction<\/p>\n<p>Ryuichi Nakada, Rikuya Nagao, Jo Onodera, Xian Zhang, Masahito Oura, Megumi Okazaki, Toshiya Tanaka, Riku Koda, Minato Tanaka, Ken Onda, Kazuhiko Maeda*<\/p>\n<p>Artificial photosynthesis that converts CO<sub>2<\/sub> into value-added chemicals under mild conditions remains a key goal in sustainable catalysis. Hybrid photocatalysts that integrate molecular CO<sub>2<\/sub> reduction cocatalysts with semiconductor light absorbers provide a versatile platform to combine molecular-level selectivity with solid-state photostability. However, their quantum efficiencies have generally remained low, partly because side reactions of the molecular component have been overlooked. Here we show that suppressing a photochemical ligand-exchange reaction of a surface-anchored Ru complex, <i>trans<\/i>(Cl)-[Ru(bpy(CH<sub>2<\/sub>PO<sub>3<\/sub>H<sub>2<\/sub>)<sub>2<\/sub>)(CO)<sub>2<\/sub>Cl<sub>2<\/sub>], markedly enhances photocatalytic CO<sub>2<\/sub> reduction over a well-established Ag-loaded polymeric carbon nitride hybrid. The suppression of this undesirable photochemical reaction is achievable under low-intensity visible light when the Ru complex is loaded at a high density. The optimized system achieves selective CO<sub>2<\/sub>-to-formate conversion with an apparent quantum yield of 27.7% at 400 nm and a formate selectivity greater than 99%. Spectroscopic analyses reveal that the suppression of photochemical ligand exchange maintains the original Ru coordination environment with large driving force for CO<sub>2<\/sub> reduction, thereby stabilizing the catalytic cycle and facilitating efficient interfacial electron transfer. These results reveal an unrecognized limitation in molecule\/semiconductor hybrid photocatalysts\u2500photochemical ligand exchange of the molecular cocatalyst\u2500and demonstrate that controlling such side reactions offers an important strategy to design high-efficiency CO<sub>2<\/sub> reduction systems.<\/p>\n<p>J. Am. Chem. Soc. 2026, 148 (10), 10924-10933.<\/p>\n<p><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/jacs.5c21374\" rel=\"nofollow\">https:\/\/pubs.acs.org\/doi\/10.1021\/jacs.5c21374<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/05\/2367\/\"><time datetime=\"2026-05-01T13:59:33+09:00\">2026\u5e745\u67081\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2312 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/02\/2312\/\" target=\"_self\" >Publication | Chem. Mater. (Motohashi, Sugimoto, et al.) \u201cUnconventional Oxygen Storage\/Release Properties of Melilite-Type Ba<sub>2<\/sub>MnGe<sub>2<\/sub>O<sub>7+\u03b4<\/sub> Associated with Complex Structural Transformation\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Unconventional Oxygen Storage\/Release Properties of Melilite-Type Ba<sub>2<\/sub>MnGe<sub>2<\/sub>O<sub>7+\uf064<\/sub> Associated with Complex Structural Transformation<\/p>\n<p>Kosaku Ohishi, Satoshi Ogawa, Hisanori Yamane, Saburo Hosokawa, Zi Lang Goo, Kunihisa Sugimoto, Miwa Saito, Teruki Motohashi<\/p>\n<p>Here, we report the synthesis and characterization of melilite-type A2MnC2O7 (A = Sr, Ba; C = Si, Ge) and the discovery of its unconventional oxygen storage and release properties. Unlike conventional Mn-containing oxygen storage materials driven by the Mn2+\/Mn3+ redox couple, Ba2MnGe2O7+\u03b4 (BMG) does not require highly reducing atmospheres for oxygen release and exhibits reversible oxygen storage\/release under oxygen-rich conditions at moderate temperatures (200\u2013500 \u00b0C). Comprehensive compositional and structural analyses utilizing X-ray absorption spectroscopy, synchrotron in situ powder X-ray diffraction, single-crystal X-ray diffraction, and powder neutron diffraction revealed that the oxygen storage\/release processes involve changes in the local coordination environment. Specifically, MnO4 tetrahedra in the reduced phase change into MnO5 trigonal bipyramids in the oxidized phase, accompanied by a distinct transformation from the fundamental melilite-type structure of Ba2MnGe2O7 (tetragonal, space group P4\u030521m) to a 5a \u00d7 5a \u00d7 1c superstructure of Ba2MnGe2O7.455(4) (tetragonal, P4\u0305). BMG exhibits a maximum oxygen storage capacity of \u03b4 \u2248 0.45 and, notably, develops a distinctive blue color upon oxygen storage. This characteristic response suggests promising potential for various oxygen-related applications, such as oxygen sensors and oxygen-sensitive inorganic pigments.<br \/>\n<a href=\"https:\/\/doi.org\/10.1021\/acs.chemmater.5c02228\"><br \/>\n<em>Chem. Mater.<\/em> <b>2026<\/b>, <i>38<\/i>, 3, 1084-1093. (DOI: 10. 10.1021\/ acs.chemmater.5c02228)<br \/>\n<\/a><\/p>\n<p><a href=\"\u201dhttps:\/\/www.kanagawa-u.ac.jp\/news\/article0101_02641\u201d\">\u30d7\u30ec\u30b9\u30ea\u30ea\u30fc\u30b9\uff08\u795e\u5948\u5ddd\u5927\u5b66\uff09<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/02\/2312\/\"><time datetime=\"2026-02-16T13:59:08+09:00\">2026\u5e742\u670816\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2308 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/02\/2308\/\" target=\"_self\" >Publication | Artif. Photosynth. (Onda, Maeda et al.) \u201cDesign Strategy for Heteroleptic Ir(III) Photosensitizers with Spatially Separated Excited Electrons toward Efficient CO2 Reduction\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Hybrid photocatalysts that integrate functional molecular units with semiconductor surfaces offer a promising route toward efficient artificial photosynthesis, yet controlling interfacial charge transfer dynamics remains a major challenge. Here we report a series of heteroleptic Ir(III) complex photosensitizers bearing 1-phenylisoquinoline ligands with phosphonic acid anchoring groups, designed to regulate the spatial localization of excited electrons. When combined with TiO<sub>2<\/sub>-loaded polymeric carbon nitride and a supramolecular <b>RuRe<\/b> photocatalyst, these Ir(III) photosensitizers improve visible-light CO<sub>2<\/sub> reduction activity to selectively yield CO. Ir(III) complexes in which the excited electron is localized on the 2,2\u2032-bipyridine ligand and is thus spatially separated from the semiconductor interface exhibited higher turnover numbers and apparent quantum yields than analogues with the excited state positioned closer to the semiconductor surface. Time-resolved photoluminescence and photoelectrochemical measurements confirmed that these molecular architectures suppress back electron transfer by facilitating long-lived one-electron-reduced species. This work demonstrates that precise control of excited-state electron localization in surface-immobilized photosensitizers provides an effective strategy to modulate interfacial charge recombination, thereby improving photocatalytic CO<sub>2<\/sub> reduction efficiency. The mechanistic insights gained here highlight a general molecular design principle for constructing integrated photocatalyst systems capable of efficient solar-to-chemical energy conversion.<\/p>\n<p>&nbsp;<\/p>\n<p>Design Strategy for Heteroleptic Ir(III) Photosensitizers with Spatially Separated Excited Electrons toward Efficient CO<sub>2<\/sub> Reduction<\/p>\n<p>&nbsp;<\/p>\n<p>Toshiya Tanaka, Masahito Oura, Rikuya Nagao, Joe Onodera, Yusuke Kuramochi, Ken Onda,* Osamu Ishitani,* Kazuhiko Maeda*<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/doi.org\/10.1021\/aps.5c00033\">Artif. Photosynth. 2026, in press.<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/02\/2308\/\"><time datetime=\"2026-02-12T14:37:23+09:00\">2026\u5e742\u670812\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2304 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/02\/2304\/\" target=\"_self\" >Publication | ACS Catal. (Katagiri, Maeda et al.) \u201cProtective Reaction Fields Created by Deep Eutectic Solvents against Molecular Oxygen in CO2 Reduction over Ru(II)-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Photocatalytic CO<sub>2<\/sub> reduction into value-added fuels has garnered considerable attention as a strategy to mitigate global warming and fossil fuel depletion. However, under practical aerobic conditions, photocatalytic activity often declines dramatically due to undesirable O<sub>2<\/sub>-photoreduction. Here, we show that deep eutectic solvents (DESs) can provide a protective reaction field against O<sub>2<\/sub> while maintaining robust CO<sub>2<\/sub> reduction performance using a Ru(II)-complex\/Ag\/polymeric carbon nitride (PCN) ternary hybrid photocatalyst. The turnover number of formic acid reached 1300 with 96% selectivity, and the apparent quantum yield was 2.7% in ethaline, composed of choline chloride and ethylene glycol, under pure CO<sub>2<\/sub> conditions. Notably, ethaline retained 84% of its formic acid productivity under aerobic conditions with high selectivity, whereas the same catalyst showed only 63%, 42%, 28%, and 4% productivity in DMSO, DMA, MeOH, and MeCN, respectively. The protective nature of ethaline against O<sub>2<\/sub> was also found in another hybrid photocatalyst consisting of a binuclear Ru(II) complex and Ag\/PCN. This superior protective reaction field against O<sub>2<\/sub> stems primarily from the low oxygen solubility and the low oxygen diffusion coefficient of ethaline. At the same time, its high CO<sub>2<\/sub> solubility, biodegradability, and nonvolatility make it a promising solvent for CO<sub>2<\/sub> reduction in O<sub>2<\/sub>-containing environments\u2500an important step toward practical photocatalytic applications.<\/p>\n<p>&nbsp;<\/p>\n<p>Protective Reaction Fields Created by Deep Eutectic Solvents against Molecular Oxygen in CO<sub>2<\/sub> Reduction over Ru(II)-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts<\/p>\n<p>&nbsp;<\/p>\n<p>Jo Onodera, Xian Zhang, Toshiya Tanaka, Ryuichi Nakada, Megumi Okazaki, Naoki Tarutani, Kiyofumi Katagiri, Kazuhiko Maeda*<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acscatal.5c07569\">ACS Catal. 2026, in press.<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/02\/2304\/\"><time datetime=\"2026-02-12T14:35:27+09:00\">2026\u5e742\u670812\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2287 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/01\/2287\/\" target=\"_self\" >Publication | J. Phys. Chem. Lett. (Okazaki, Maeda, Sugimoto, Katagiri et al.) \u201cIn Situ X-ray Absorption Fine Structure Spectroscopy Measurement of Suspended Cobalt Oxide Nanoparticle Water Oxidation Catalyst\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>In Situ X-ray Absorption Fine Structure Spectroscopy Measurement of Suspended Cobalt Oxide Nanoparticle Water Oxidation Catalyst<\/p>\n<p>Megumi Okazaki,* Zi Lang Goo, Haruka Yamamoto, Kenta Ikegami, Issei Yamamoto, Naoki Tarutani, Fumitaka Takeiri, Takeshi Watanabe, Shunsuke Nozawa, Kiyofumi Katagiri, Kunihisa Sugimoto, Kazuhiko Maeda*<\/p>\n<p>Water oxidation using a heterogeneous catalyst under near-neutral pH conditions is of importance in artificial photosynthesis. This work assessed photochemical water oxidation over a supported cobalt oxide (CoO<sub><i>x<\/i><\/sub>) nanoparticle catalyst in the presence of Ru(II) trisdiimine as a photosensitizer and sodium persulfate as an electron acceptor, in both phosphate and borate buffer solutions at a pH of 7.9, using X-ray absorption fine structure spectroscopy (XAFS). The steady-state activity of the CoO<sub><i>x<\/i><\/sub> was found to be increased by a factor of 3\u22124 in the phosphate buffer. Co-<i>K<\/i> edge in situ XAFS measurement revealed that this catalyst maintained a high-valence CoOOH-like local structure during photoirradiation in the phosphate buffer. In contrast, CoOOH-like species rapidly formed in the borate buffer but remained stable for less than 40 min, with the subsequent generation of a mixture of Co<sup>2+<\/sup> and Co<sup>3+<\/sup> states with 4 and 6 coordination numbers. These results indicate that the phosphate buffer evidently promoted the generation and stabilization of active CoOOH species, thus facilitating water oxidation. The borate buffer failed to sustain these active species, resulting in lower catalytic activity. These insights provide a basis for the rational design of catalytic systems, emphasizing the importance of buffer-controlled local environments in sustaining active species for efficient water oxidation.<\/p>\n<p><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.jpclett.5c03125\">J. Phys. Chem. Lett. 2026, in press.<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/01\/2287\/\"><time datetime=\"2026-01-19T15:03:23+09:00\">2026\u5e741\u670819\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2280 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/01\/2280\/\" target=\"_self\" >Publication | J. Am. Chem. Soc. (Ohmi, Taniguchi, Bhawna, Fukui, Yamamoto et al.) \u201cDimensionality Reduction of Formamidinium-Rich Lead Iodide Perovskite-Derived Structures\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Dimensionality Reduction of Formamidinium-Rich Lead Iodide Perovskite-Derived Structures<\/p>\n<p>Takuya Ohmi, Wataru Taniguchi, Bhawna, Tomoya Fukui, Yuki Haruta, Takayuki Nakanishi, Takanori Fukushima, Makhsud I. Saidaminov, Masaki Azuma, Takafumi Yamamoto*<\/p>\n<p>Formamidinium lead iodide, FAPbI<sub>3<\/sub> (FA<sup>+<\/sup> = CH(NH<sub>2<\/sub>)<sub>2<\/sub><sup>+<\/sup>), with a cubic perovskite structure is among the most studied organic\u2013inorganic hybrid perovskites. Despite several reports only on thin films of FA-rich lead iodide perovskites, such as FA<sub>2<\/sub>PbI<sub>4<\/sub>, their structures remain unknown due to challenges in characterizing polycrystalline films. Here, we report two new phases of FA-rich lead iodide perovskite-derived structures, FA<sub>2<\/sub>PbI<sub>4<\/sub> and FA<sub>3<\/sub>PbI<sub>5<\/sub>, in the bulk form. These materials feature two- and one-dimensional octahedral networks of perovskite, respectively, allowing for bandgap tuning among FA\u2013Pb\u2013I compositions. This study presents a novel approach to controlling the structural dimensionality of perovskites and their optical properties.<\/p>\n<p><a href=\"https:\/\/doi.org\/10.1021\/jacs.5c17829\">J. Am. Chem. Soc. 2026, in press.<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/01\/2280\/\"><time datetime=\"2026-01-19T12:20:29+09:00\">2026\u5e741\u670819\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><li class=\"wp-block-post post-2276 post type-post status-publish format-standard hentry category-news en-US\">\n<h2 style=\"font-size:64px;line-height:1.2\" class=\"wp-block-post-title\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/01\/2276\/\" target=\"_self\" >Publication | Chem. Mater. (Tsuji, Tanaka, Maeda et al.) \u201cSubstituent-Position-Dependent Electrochemical CO2 Reduction Activity of Pb\u2013S-Based Coordination Polymers\u201d<\/a><\/h2>\n\n\n\n<div class=\"entry-content wp-block-post-content is-layout-flow wp-block-post-content-is-layout-flow\"><p>Substituent-Position-Dependent Electrochemical CO<sub>2<\/sub> Reduction Activity of Pb\u2013S-Based Coordination Polymers<\/p>\n<p>Shunta Iwamoto, Ryohei Akiyoshi, Sora Nakasone, Chomponoot Suppaso, Megumi Okazaki, Kazuhide Kamiya, Yuta Tsuji,* Daisuke Tanaka,* Kazuhiko Maeda*<\/p>\n<p>Developing electrocatalysts for CO<sub>2<\/sub> reduction is essential for the effective use of renewable energy. Materials containing molecules such as coordination polymers have strong potential to exhibit high activity and selectivity. However, a critical shortcoming is that they often decompose into metals or metal oxides during reactions, thereby preventing the manifestation of functions unique to molecular structures. In this study, we compare a series of Pb\u2013S-based coordination polymers, [Pb(<i>x<\/i>-SPhOMe)<sub>2<\/sub>]<sub><i>n<\/i><\/sub> (HSPhOMe = methoxybenzenethiol, <i>x<\/i> = <i>ortho<\/i> (KGF-32), <i>meta<\/i> (KGF-33), and <i>para<\/i> (KGF-34)), as model electrocatalysts to investigate the design guidelines. They have different crystal structures in terms of dimensionality and coordination environment. Among them, KGF-32 shows the highest Faradaic efficiency for formate production: 96.6 \u00b1 2.9% at \u22121.0 V vs RHE with a partial current density of \u22129.76 \u00b1 2.1 mA cm<sup>\u20132<\/sup>. By contrast, KGF-33 and -34 show lower Faradaic efficiencies for formate production, along with more pronounced decomposition to PbCO<sub>3<\/sub>. We use scanning electron microscopy, X-ray diffraction, and Raman spectroscopy to confirm that KGF-32 retains much of its crystal structure during operation, whereas KGF-33 and -34 decompose extensively. In addition, density functional theory calculations reveal that the energy barrier for formate production on KGF-32 is lower than that on PbCO<sub>3<\/sub>, which explains its superior catalytic activity. Our work demonstrates the inherent advantages of coordination-polymer-based electrocatalysts and provides valuable guidelines for designing more efficient and stable systems for CO<sub>2<\/sub> reduction.<\/p>\n<p><a href=\"https:\/\/doi.org\/10.1021\/acs.chemmater.5c03173\">Chem. Mater. 2026, in press.<\/a><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flex wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"wp-block-post-date\"><a href=\"https:\/\/supraceramics.jp\/en\/2026\/01\/2276\/\"><time datetime=\"2026-01-19T12:18:05+09:00\">2026\u5e741\u670819\u65e5<\/time><\/a><\/div>\n\n<div style=\"font-size:16px\" class=\"taxonomy-category wp-block-post-terms\"><a href=\"https:\/\/supraceramics.jp\/en\/category\/news\/\" rel=\"tag\">News<\/a><\/div>\n\n<\/div>\n\n\n\n<div style=\"height:120px;\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/li><\/ul>\n\n<nav class=\"wp-block-query-pagination is-layout-flex wp-block-query-pagination-is-layout-flex\" aria-label=\"Pagination\">\n<div class=\"wp-block-query-pagination\">\n\n<a href=\"\/en\/wp-json\/wp\/v2\/pages\/236?query-8-page=2\" class=\"wp-block-query-pagination-next\">Next Page<\/a><\/div>\n<\/nav><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":222414606,"featured_media":0,"parent":0,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_themeisle_gutenberg_block_has_review":false,"_locale":"en_US","_original_post":"https:\/\/supraceramics.jp\/home\/","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false},"class_list":["post-236","page","type-page","status-publish","hentry","en-US"],"jetpack_shortlink":"https:\/\/wp.me\/Pe2JgX-3O","jetpack-related-posts":[],"jetpack_sharing_enabled":false,"_links":{"self":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/pages\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/users\/222414606"}],"replies":[{"embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/comments?post=236"}],"version-history":[{"count":2,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/pages\/236\/revisions"}],"predecessor-version":[{"id":238,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/pages\/236\/revisions\/238"}],"wp:attachment":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/media?parent=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}