{"id":2304,"date":"2026-02-12T14:35:27","date_gmt":"2026-02-12T05:35:27","guid":{"rendered":"https:\/\/supraceramics.jp\/?p=2304"},"modified":"2026-02-12T14:35:27","modified_gmt":"2026-02-12T05:35:27","slug":"publication-acs-catal-katagiri-maeda-et-al-protective-reaction-fields-created-by-deep-eutectic-solvents-against-molecular-oxygen-in-co2-reduction-over-ruii-complex-ag-polymeric-carbo","status":"publish","type":"post","link":"https:\/\/supraceramics.jp\/en\/2026\/02\/2304\/","title":{"rendered":"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"},"content":{"rendered":"<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","protected":false},"excerpt":{"rendered":"<p>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 O2 while maintaining robust CO2 [&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=2302","_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-2304","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-Ba","jetpack-related-posts":[{"id":2367,"url":"https:\/\/supraceramics.jp\/en\/2026\/05\/2367\/","url_meta":{"origin":2304,"position":0},"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":2302,"url":"https:\/\/supraceramics.jp\/2026\/02\/2302\/","url_meta":{"origin":2304,"position":1},"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":"\u7814\u7a76\u6210\u679c\uff1a\u6df1\u5171\u6676\u6eb6\u5a92\u3092\u4f7f\u3063\u3066\u9178\u7d20\u5b58\u5728\u4e0b\u3067\u3082CO2\u9084\u5143\u3092\u5b9f\u73fe\uff08C02\u524d\u7530\u3001A01\u7247\u6850\u3089\uff09 \u6982\u8981 \u5149\u89e6\u5a92\u306b\u3088\u308bCO2\u9084\u5143\u306f\u5730\u7403\u6e29\u6696\u5316\u3084\u5316\u77f3\u71c3\u6599\u67af\u6e07\u3078\u306e\u5bfe\u7b56\u3068\u3057\u3066\u6ce8\u76ee\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u74b0\u5883\u306b\u8fd1\u3044\u9178\u7d20\u5b58\u5728\u4e0b\u3067\u306f\u3001\u9178\u7d20\u306e\u5149\u9084\u5143\u306b\u3088\u308a\u6d3b\u6027\u304c\u5927\u304d\u304f\u4f4e\u4e0b\u3059\u308b\u3068\u3044\u3046\u8ab2\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u672c\u7814\u7a76\u3067\u306f\u3001\u6df1\u5171\u6676\u6eb6\u5a92\u304c\u9178\u7d20\u3092\u906e\u853d\u3059\u308b\u53cd\u5fdc\u5834\u3068\u3057\u3066\u6a5f\u80fd\u3057\u3001Ru(II)\u932f\u4f53\/Ag\/\u30dd\u30ea\u30de\u30fc\u72b6\u7a92\u5316\u70ad\u7d20\u304b\u3089\u306a\u308b\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u5149\u89e6\u5a92\u306b\u3088\u308bCO2\u9084\u5143\u6d3b\u6027\u3092\u7dad\u6301\u3067\u304d\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3057\u305f\u3002\u5869\u5316\u30b3\u30ea\u30f3\u3068\u30a8\u30c1\u30ec\u30f3\u30b0\u30ea\u30b3\u30fc\u30eb\u304b\u3089\u306a\u308b\u6df1\u5171\u6676\u6eb6\u5a92\u30a8\u30bf\u30ea\u30f3\u4e2d\u3067\u306f\u3001\u30ae\u9178\u751f\u6210\u306e\u56de\u8ee2\u65701300\u3001\u9078\u629e\u738796%\u3092\u9054\u6210\u3057\u3001\u7a7a\u6c17\u5b58\u5728\u4e0b\u3067\u3082\u9ad8\u3044\u6d3b\u6027\u3092\u4fdd\u6301\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u30a8\u30bf\u30ea\u30f3\u306e\u4f4e\u3044\u9178\u7d20\u6eb6\u89e3\u5ea6\u3068\u62e1\u6563\u4fc2\u6570\u306b\u8d77\u56e0\u3059\u308b\u3082\u306e\u3067\u3042\u308a\u3001\u5b9f\u7528\u7684\u306aCO2\u5149\u9084\u5143\u306b\u5411\u3051\u305f\u6709\u671b\u306a\u6eb6\u5a92\u8a2d\u8a08\u6307\u91dd\u3092\u793a\u3059\u6210\u679c\u3067\u3059\u3002\u672c\u6210\u679c\u306f\u3001ACS Catal.\u8a8c\u306b\u30aa\u30f3\u30e9\u30a4\u30f3\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002 Protective Reaction Fields Created by Deep Eutectic Solvents against Molecular Oxygen in CO2 Reduction over Ru(II)-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts \u00a0 Jo Onodera, Xian Zhang, Toshiya Tanaka, Ryuichi Nakada, Megumi Okazaki, Naoki Tarutani, Kiyofumi Katagiri, Kazuhiko Maeda* \u00a0 ACS Catal. 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":2364,"url":"https:\/\/supraceramics.jp\/2026\/05\/2364\/","url_meta":{"origin":2304,"position":2},"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":"\u7814\u7a76\u6210\u679c\uff1a\u5149\u306e\u201c\u5f53\u3066\u3059\u304e\u201d\u306b\u6ce8\u610f\u3057\u3066\u9ad8\u52b9\u7387CO2\u9084\u5143\u3092\u5b9f\u73fe\uff08C02\u524d\u7530\u3001B03\u6069\u7530\u3089\uff09 CO2\u3092\u5149\u30a8\u30cd\u30eb\u30ae\u30fc\u3067\u6709\u7528\u7269\u8cea\u3078\u5909\u63db\u3059\u308b\u4eba\u5de5\u5149\u5408\u6210\u3067\u306f\u3001\u932f\u4f53\u5206\u5b50\u89e6\u5a92\u306e\u9ad8\u3044\u9078\u629e\u6027\u3068\u534a\u5c0e\u4f53\u306e\u512a\u308c\u305f\u5149\u5438\u53ce\u7279\u6027\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u7cfb\u304c\u6709\u671b\u8996\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u5b9f\u969b\u306e\u53cd\u5fdc\u52b9\u7387\u306f\u671f\u5f85\u307b\u3069\u5411\u4e0a\u305b\u305a\u3001\u305d\u306e\u8981\u56e0\u306f\u4e0d\u660e\u78ba\u3067\u3057\u305f\u3002\u672c\u7814\u7a76\u3067\u306f\u3001\u534a\u5c0e\u4f53\u8868\u9762\u306b\u56fa\u5b9a\u5316\u3057\u305f\u30eb\u30c6\u30cb\u30a6\u30e0\u932f\u4f53\u304c\u5149\u3092\u76f4\u63a5\u5438\u53ce\u3059\u308b\u3068\u4e0d\u8981\u306a\u5149\u5316\u5b66\u53cd\u5fdc\u304c\u9032\u884c\u3057\u3001\u89e6\u5a92\u69cb\u9020\u306e\u5909\u5316\u3092\u4f34\u3063\u3066CO2\u9084\u5143\u6d3b\u6027\u304c\u8457\u3057\u304f\u4f4e\u4e0b\u3059\u308b\u3053\u3068\u3092\u898b\u51fa\u3057\u305f\u3002\u305d\u3053\u3067\u5206\u5b50\u89e6\u5a92\u306e\u8868\u9762\u5bc6\u5ea6\u3068\u5149\u5f37\u5ea6\u3092\u7cbe\u5bc6\u306b\u5236\u5fa1\u3057\u3001\u534a\u5c0e\u4f53\u306e\u307f\u3092\u52b9\u7387\u7684\u306b\u52b1\u8d77\u3059\u308b\u8a2d\u8a08\u3092\u5c0e\u5165\u3057\u305f\u7d50\u679c\u3001\u53ef\u8996\u5149\u4e0b\u3067CO2\u3092\u30ae\u9178\u3078\u307b\u307c\u5b8c\u5168\u306b\u5909\u63db\u3059\u308b\u9ad8\u9078\u629e\u6027\uff0899%\u4ee5\u4e0a\uff09\u3068\u3001\u30cf\u30a4\u30d6\u30ea\u30c3\u30c9\u7cfb\u3068\u3057\u3066\u4e16\u754c\u6700\u9ad8\u6c34\u6e96\u306e\u898b\u304b\u3051\u91cf\u5b50\u53ce\u7387\uff0827.7%\uff09\u3092\u9054\u6210\u3057\u307e\u3057\u305f\u3002\u672c\u6210\u679c\u306f\u3001\u932f\u4f53\u5206\u5b50\u89e6\u5a92\u306e\u5149\u5438\u53ce\u5236\u5fa1\u304c\u9ad8\u52b9\u7387\u4eba\u5de5\u5149\u5408\u6210\u306e\u9375\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u91cd\u8981\u306a\u6307\u91dd\u3068\u306a\u308a\u307e\u3059\u3002\u672c\u6210\u679c\u306f\u3001J. Am. Chem. Soc.\u8a8c\u306b\u30aa\u30f3\u30e9\u30a4\u30f3\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002 \u8ad6\u6587\u60c5\u5831 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* J. Am. Chem. Soc. 2026, 148\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":2308,"url":"https:\/\/supraceramics.jp\/en\/2026\/02\/2308\/","url_meta":{"origin":2304,"position":3},"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":2238,"url":"https:\/\/supraceramics.jp\/en\/2025\/12\/2238\/","url_meta":{"origin":2304,"position":4},"title":"Symposium in Pacifichem 2025, 12\/17 (Wed)","author":"shorike","date":"2025\u5e7412\u67083\u65e5","format":false,"excerpt":"Pacifichem 2025 ~Inorganic Materials with Multiple Components for Energy and Environmental Applications\uff08ING016\uff09~ 12\/17 (Wed), 2025 Hilton Hawaiian Village Organizers: Ryo Ohtani, Jeongsuk Seo, Lianzhou Wang,\u00a0Kazuhiko Maeda \u00a0 Program: 8:00\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ~Opening Remarks~ 8:05\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Solution Chemistry Engineering for Efficient Kesterite Solar Cells and Modules Xin, Hao (Nanjing University of Posts and Telecommunications)\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":2232,"url":"https:\/\/supraceramics.jp\/2025\/12\/2232\/","url_meta":{"origin":2304,"position":5},"title":"Symposium in Pacifichem 2025, 12\/17 (Wed)","author":"shorike","date":"2025\u5e7412\u67083\u65e5","format":false,"excerpt":"Pacifichem 2025 ~Inorganic Materials with Multiple Components for Energy and Environmental Applications\uff08ING016\uff09~ 12\/17 (Wed), 2025 Hilton Hawaiian Village Organizers: Ryo Ohtani, Jeongsuk Seo, Lianzhou Wang,\u00a0Kazuhiko Maeda \u00a0 Program: 8:00\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ~Opening Remarks~ 8:05\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Solution Chemistry Engineering for Efficient Kesterite Solar Cells and Modules Xin, Hao (Nanjing University of Posts and Telecommunications)\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\/2304","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=2304"}],"version-history":[{"count":1,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2304\/revisions"}],"predecessor-version":[{"id":2305,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2304\/revisions\/2305"}],"wp:attachment":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/media?parent=2304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/categories?post=2304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/tags?post=2304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}