{"id":2308,"date":"2026-02-12T14:37:23","date_gmt":"2026-02-12T05:37:23","guid":{"rendered":"https:\/\/supraceramics.jp\/?p=2308"},"modified":"2026-02-12T14:37:23","modified_gmt":"2026-02-12T05:37:23","slug":"publication-artif-photosynth-onda-maeda-et-al-design-strategy-for-heteroleptic-iriii-photosensitizers-with-spatially-separated-excited-electrons-toward-efficient-co2-reduction","status":"publish","type":"post","link":"https:\/\/supraceramics.jp\/en\/2026\/02\/2308\/","title":{"rendered":"Publication | Artif. Photosynth. (Onda, Maeda et al.) \u201cDesign Strategy for Heteroleptic Ir(III) Photosensitizers with Spatially Separated Excited Electrons toward Efficient CO2 Reduction\u201d"},"content":{"rendered":"<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","protected":false},"excerpt":{"rendered":"<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. [&hellip;]<\/p>\n","protected":false},"author":222414606,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_themeisle_gutenberg_block_has_review":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_locale":"en_US","_original_post":"https:\/\/supraceramics.jp\/?p=2306","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[124830],"tags":[],"class_list":["post-2308","post","type-post","status-publish","format-standard","hentry","category-news","en-US"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pe2JgX-Be","jetpack-related-posts":[{"id":2306,"url":"https:\/\/supraceramics.jp\/2026\/02\/2306\/","url_meta":{"origin":2308,"position":0},"title":"Publication | Artif. Photosynth. (Onda, Maeda et al.) \u201cDesign Strategy for Heteroleptic Ir(III) Photosensitizers with Spatially Separated Excited Electrons toward Efficient CO2 Reduction\u201d","author":"shorike","date":"2026\u5e742\u670812\u65e5","format":false,"excerpt":"\u7814\u7a76\u6210\u679c\uff1a\u7cbe\u5bc6\u8a2d\u8a08\u3055\u308c\u305fIr\u932f\u4f53\u5149\u5897\u611f\u5264\u3067CO2\u9084\u5143\u3092\u52a0\u901f\uff08C02\u524d\u7530\u3001B03\u6069\u7530\u3089\uff09 \u6982\u8981 \u5206\u5b50\u5149\u89e6\u5a92\u3068\u534a\u5c0e\u4f53\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u5149\u89e6\u5a92\u306f\u4eba\u5de5\u5149\u5408\u6210\u7cfb\u69cb\u7bc9\u306e\u6709\u671b\u306a\u624b\u6cd5\u3067\u3059\u304c\u3001\u754c\u9762\u3067\u306e\u96fb\u5b50\u306e\u632f\u308b\u821e\u3044\u306e\u5236\u5fa1\u304c\u8ab2\u984c\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u672c\u7814\u7a76\u3067\u306f\u3001\u52b1\u8d77\u96fb\u5b50\u306e\u4f4d\u7f6e\u3092\u5206\u5b50\u5185\u3067\u5236\u5fa1\u3067\u304d\u308bIr(III)\u932f\u4f53\u5149\u5897\u611f\u5264\u3092\u8a2d\u8a08\u3057\u3001TiO2\u62c5\u6301\u30dd\u30ea\u30de\u30fc\u72b6\u7a92\u5316\u70ad\u7d20\u304a\u3088\u3073RuRe\u932f\u4f53\u5149\u89e6\u5a92\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u53ef\u8996\u5149CO2\u9084\u5143\u3092\u884c\u3044\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u52b1\u8d77\u96fb\u5b50\u304c\u534a\u5c0e\u4f53\u8868\u9762\u304b\u3089\u96e2\u308c\u305f\u4f4d\u7f6e\u306b\u5b58\u5728\u3059\u308b\u932f\u4f53\u307b\u3069\u3001\u9ad8\u3044\u53cd\u5fdc\u52b9\u7387\u3092\u793a\u3059\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u5206\u5149\u30fb\u96fb\u6c17\u5316\u5b66\u6e2c\u5b9a\u304b\u3089\u3001\u9006\u96fb\u5b50\u79fb\u52d5\u306e\u6291\u5236\u304c\u9ad8\u52b9\u7387\u5316\u306e\u8981\u56e0\u3067\u3042\u308b\u3053\u3068\u304c\u660e\u3089\u304b\u3068\u306a\u308a\u3001\u5206\u5b50\u8a2d\u8a08\u306b\u3088\u308b\u5149\u89e6\u5a92\u6027\u80fd\u5411\u4e0a\u306e\u6307\u91dd\u304c\u793a\u3055\u308c\u307e\u3057\u305f\u3002\u672c\u6210\u679c\u306f\u3001Artif. Photosynth.\u8a8c\u306b\u30aa\u30f3\u30e9\u30a4\u30f3\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002\uff08\u5316\u5b66\u5f0f\u306e\u6570\u5b57\u306f\u5168\u3066\u4e0b\u4ed8\u304d\uff09 \u00a0 \u8ad6\u6587\u60c5\u5831 Design Strategy for Heteroleptic Ir(III) Photosensitizers with Spatially Separated Excited Electrons toward Efficient CO2 Reduction \u00a0 Toshiya Tanaka, Masahito Oura, Rikuya Nagao, Joe Onodera, Yusuke Kuramochi, Ken Onda,* Osamu Ishitani,* Kazuhiko Maeda* \u00a0 Artif. Photosynth. 2026, in press.","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2253,"url":"https:\/\/supraceramics.jp\/en\/2025\/12\/2253\/","url_meta":{"origin":2308,"position":1},"title":"Publication | ACS Catal. (Maeda, Onda et al.) \u201cCharge Transfer Dynamics in Dye-Sensitized Photocatalysts Using Metal Complex Sensitizers with Long-Wavelength Visible Light Absorption Based on Singlet\u2013Triplet Excitation\u201d","author":"shorike","date":"2025\u5e7412\u67086\u65e5","format":false,"excerpt":"Charge Transfer Dynamics in Dye-Sensitized Photocatalysts Using Metal Complex Sensitizers with Long-Wavelength Visible Light Absorption Based on Singlet\u2013Triplet Excitation Haruka Yamamoto, Toshiya Tanaka, Masahito Oura, Kelly M. Kopera, Megumi Okazaki, Ken Onda, Thomas E. Mallouk,* Kazuhiko Maeda* An Os(II) polypyridyl complex was applied as a photosensitizer in dye-sensitized photocatalyst systems\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1888,"url":"https:\/\/supraceramics.jp\/en\/2023\/06\/1888\/","url_meta":{"origin":2308,"position":2},"title":"Publication | Angew. Chem. Int. Ed. (Maeda, Tanaka, Motohashi et al.) \u201cTin(II)-Based Metal\u2013Organic Frameworks Enabling Efficient, Selective Reduction of CO2 to Formate under Visible Light\u201d","author":"shorike","date":"2023\u5e746\u67083\u65e5","format":false,"excerpt":"Tin(II)-Based Metal\u2013Organic Frameworks Enabling Efficient, Selective Reduction of CO \u2082 to Formate under Visible Light Yoshinobu Kamakura, Chomponoot Suppaso, Issei Yamamoto, Ryusuke Mizuochi, Yusuke Asai, Teruki Motohashi, Daisuke Tanaka, Kazuhiko Maeda Certain metal complexes are known as high-performance CO2 reduction photocatalysts driven by visible light. However, most of them rely\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1845,"url":"https:\/\/supraceramics.jp\/en\/2024\/11\/1845\/","url_meta":{"origin":2308,"position":3},"title":"Publication | Chem Catal. (Okazaki, Maeda et al.) \u201cDiscovery of the threshold potential that triggers photochemical water oxidation with Ru(II) photosensitizers and MOx catalysts\u201d","author":"shorike","date":"2024\u5e7411\u670813\u65e5","format":false,"excerpt":"Discovery of the threshold potential that triggers photochemical water oxidation with Ru(II) photosensitizers and MOx catalysts Megumi Okazaki*, Yasuomi Yamazaki, Daling Lu, Shunsuke Nozawa, Osamu Ishitani, Kazuhiko Maeda* This work focuses on a traditional, well-known photochemical water oxidation system that uses a Ru(II) tris-2,2\u2032-bipyridine photosensitizer and transition-metal oxide catalysts, which\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2304,"url":"https:\/\/supraceramics.jp\/en\/2026\/02\/2304\/","url_meta":{"origin":2308,"position":4},"title":"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","author":"shorike","date":"2026\u5e742\u670812\u65e5","format":false,"excerpt":"Photocatalytic CO2 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 O2-photoreduction. Here, we show that deep eutectic solvents (DESs) can provide a protective reaction field against\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2276,"url":"https:\/\/supraceramics.jp\/en\/2026\/01\/2276\/","url_meta":{"origin":2308,"position":5},"title":"Publication | Chem. Mater. (Tsuji, Tanaka, Maeda et al.) \u201cSubstituent-Position-Dependent Electrochemical CO2 Reduction Activity of Pb\u2013S-Based Coordination Polymers\u201d","author":"shorike","date":"2026\u5e741\u670819\u65e5","format":false,"excerpt":"Substituent-Position-Dependent Electrochemical CO2 Reduction Activity of Pb\u2013S-Based Coordination Polymers Shunta Iwamoto, Ryohei Akiyoshi, Sora Nakasone, Chomponoot Suppaso, Megumi Okazaki, Kazuhide Kamiya, Yuta Tsuji,* Daisuke Tanaka,* Kazuhiko Maeda* Developing electrocatalysts for CO2 reduction is essential for the effective use of renewable energy. Materials containing molecules such as coordination polymers have strong\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2308","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/types\/post"}],"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=2308"}],"version-history":[{"count":1,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2308\/revisions"}],"predecessor-version":[{"id":2309,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2308\/revisions\/2309"}],"wp:attachment":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/media?parent=2308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/categories?post=2308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/tags?post=2308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}