{"id":2253,"date":"2025-12-06T12:24:35","date_gmt":"2025-12-06T03:24:35","guid":{"rendered":"https:\/\/supraceramics.jp\/?p=2253"},"modified":"2025-12-06T12:24:35","modified_gmt":"2025-12-06T03:24:35","slug":"publication-acs-catal-maeda-onda-et-al-charge-transfer-dynamics-in-dye-sensitized-photocatalysts-using-metal-complex-sensitizers-with-long-wavelength-visible-light-absorption-based-on","status":"publish","type":"post","link":"https:\/\/supraceramics.jp\/en\/2025\/12\/2253\/","title":{"rendered":"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"},"content":{"rendered":"<p>Charge Transfer Dynamics in Dye-Sensitized Photocatalysts Using Metal Complex Sensitizers with Long-Wavelength Visible Light Absorption Based on Singlet\u2013Triplet Excitation<\/p>\n<p>Haruka Yamamoto, Toshiya Tanaka, Masahito Oura, Kelly M. Kopera, Megumi Okazaki, Ken Onda, Thomas E. Mallouk,* Kazuhiko Maeda*<\/p>\n<p>An Os(II) polypyridyl complex was applied as a photosensitizer in dye-sensitized photocatalyst systems based on Pt-intercalated HCa<sub>2<\/sub>Nb<sub>3<\/sub>O<sub>10<\/sub> and Pt-loaded TiO<sub>2<\/sub>. The Os(II) complex exhibits a spin-forbidden but partially allowed triplet metal-to-ligand charge transfer (<sup>3<\/sup>MLCT) transition, enabling broad visible light absorption up to 800 nm, which surpasses that of conventional Ru(II)-based dyes. Despite its shorter excited-state lifetime compared to Ru(II) complexes, efficient electron injection from the excited Os(II) dye into the semiconductor was confirmed. Under visible-light irradiation, the Os(II)-sensitized photocatalysts showed higher H<sub>2<\/sub> evolution activity than the Ru(II)-sensitized photocatalysts when sodium ascorbate was used as an electron donor, demonstrating effective utilization of long-wavelength visible light. In contrast, negligible H<sub>2<\/sub> evolution was observed when NaI was employed as a redox mediator for Z-scheme water splitting. Transient absorption spectroscopy revealed that the lack of activity stemmed from inefficient electron transfer from I<sup>\u2013<\/sup> to oxidized Os(II). These findings highlight the importance of selecting appropriate redox mediators to fully exploit long-wavelength dyes for overall water splitting under visible light.<\/p>\n<p><a href=\"https:\/\/pubs.acs.org\/doi\/full\/10.1021\/acscatal.5c06687\">ACS Catal. 2025, in press.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 based on Pt-intercalated HCa2Nb3O10 and [&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=2250","_jetpack_feature_clip_id":0,"_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-2253","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-Al","jetpack-related-posts":[{"id":2250,"url":"https:\/\/supraceramics.jp\/2025\/12\/2250\/","url_meta":{"origin":2253,"position":0},"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* \u672c\u7814\u7a76\u3067\u306f\u3001Os(II)\u30dd\u30ea\u30d4\u30ea\u30b8\u30eb\u932f\u4f53\u3092\u53ef\u8996\u5149\u5fdc\u7b54\u578b\u8272\u7d20\u3068\u3057\u3066\u7528\u3044\u3001Pt\u62c5\u6301TiO2\u304a\u3088\u3073Pt\u62c5\u6301HCa2Nb3O10\u304b\u3089\u306a\u308b\u8272\u7d20\u5897\u611f\u5149\u89e6\u5a92\u7cfb\u3078\u5fdc\u7528\u3057\u307e\u3057\u305f\u3002\u672c\u7cfb\u3067\u306f\u3001\u5f93\u6765\u5229\u7528\u3067\u304d\u306a\u304b\u3063\u305f\u9577\u6ce2\u9577\u306e\u53ef\u8996\u5149\u3082\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u592a\u967d\u5149\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u304b\u3089\u6c34\u7d20\u3092\u751f\u6210\u3059\u308b\u969b\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u5909\u63db\u52b9\u7387\u3092\u5f93\u6765\u306e\u7d042\u500d\u307e\u3067\u9ad8\u3081\u308b\u3053\u3068\u306b\u6210\u529f\u3057\u307e\u3057\u305f\u3002\u3055\u3089\u306b\u306f\u3001\u904e\u6e21\u5438\u53ce\u5206\u5149\u3092\u7528\u3044\u3066\u8272\u7d20\u5897\u611f\u578b\u5149\u89e6\u5a92\u306b\u304a\u3051\u308b\u8a73\u7d30\u306a\u30ad\u30e3\u30ea\u30a2\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u3082\u89e3\u660e\u3057\u307e\u3057\u305f\u3002\u672c\u7814\u7a76\u3067\u5f97\u3089\u308c\u305f\u77e5\u898b\u306f\u3001\u9577\u6ce2\u9577\u306e\u53ef\u8996\u5149\u3092\u6d3b\u7528\u3057\u305f\u4eba\u5de5\u5149\u5408\u6210\u7cfb\u69cb\u7bc9\u306e\u305f\u3081\u306e\u57fa\u76e4\u7684\u306a\u77e5\u898b\u306b\u306a\u308b\u3068\u671f\u5f85\u3055\u308c\u307e\u3059\u3002\u672c\u6210\u679c\u306f\u3001ACS Catal.\u8a8c\u306b\u30aa\u30f3\u30e9\u30a4\u30f3\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002 ACS Catal. 2025, 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":2308,"url":"https:\/\/supraceramics.jp\/en\/2026\/02\/2308\/","url_meta":{"origin":2253,"position":1},"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":"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\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":2253,"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":2367,"url":"https:\/\/supraceramics.jp\/en\/2026\/05\/2367\/","url_meta":{"origin":2253,"position":3},"title":"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","author":"shorike","date":"2026\u5e745\u67081\u65e5","format":false,"excerpt":"Elucidating the Origin of Hidden Limitations in Ru-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts for Visible-Light CO2 Reduction Ryuichi Nakada, Rikuya Nagao, Jo Onodera, Xian Zhang, Masahito Oura, Megumi Okazaki, Toshiya Tanaka, Riku Koda, Minato Tanaka, Ken Onda, Kazuhiko Maeda* Artificial photosynthesis that converts CO2 into value-added chemicals under mild conditions remains\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":2375,"url":"https:\/\/supraceramics.jp\/en\/2026\/05\/2375\/","url_meta":{"origin":2253,"position":4},"title":"Publication | Chem. Commun. (Onda, Maeda et al.) \u201cIntroducing an insulating alumina layer into a molecular photocathode to improve CO2 reduction activity\u201d","author":"shorike","date":"2026\u5e745\u67081\u65e5","format":false,"excerpt":"Introducing an insulating alumina layer into a molecular photocathode to improve CO2 reduction activity Yu Takagi, Masaya Yara, Toshiya Tanaka, Jo Onodera, Minato Tanaka, Megumi Okazaki, Kiyoshi Miyata, Ken Onda,* Osamu Ishitani,* Kazuhiko Maeda* Interfacial engineering with an Al2O3 overlayer enhances visible-light-driven CO2 reduction on p-type NiO photocathodes incorporating Ru(II)-based\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":2371,"url":"https:\/\/supraceramics.jp\/en\/2026\/05\/2371\/","url_meta":{"origin":2253,"position":5},"title":"Publication | Inorg. Chem. (Ishiwari, Tanaka, Maeda et al.) \u201cA Lead(II)-Based Coordination Polymer Exhibiting Photocatalytic and Electrochemical CO2 Reduction Activities\u201d","author":"shorike","date":"2026\u5e745\u67081\u65e5","format":false,"excerpt":"A Lead(II)-Based Coordination Polymer Exhibiting Photocatalytic and Electrochemical CO2 Reduction Activities Chomponoot Suppaso, Yura Jang, Saori Ogura, Ryohei Akiyoshi, Ryuichi Nakada, Megumi Okazaki, Fumitaka Ishiwari, Kazuyoshi Ogasawara, Akinori Saeki, Daisuke Tanaka,* Kazuhiko Maeda* Mixed-anion compounds incorporating multiple anionic species within a single crystal lattice can exhibit novel structural and functional\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\/2253","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=2253"}],"version-history":[{"count":1,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2253\/revisions"}],"predecessor-version":[{"id":2254,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2253\/revisions\/2254"}],"wp:attachment":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/media?parent=2253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/categories?post=2253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/tags?post=2253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}