TY - JOUR
T1 - Photocatalytic CO2 reduction by a Z-scheme mechanism in an aqueous suspension of particulate (CuGa)0.3Zn1.4S2, BiVO4 and a Co complex operating dual-functionally as an electron mediator and as a cocatalyst
AU - Suzuki, Tomiko M.
AU - Yoshino, Shunya
AU - Sekizawa, Keita
AU - Yamaguchi, Yuichi
AU - Kudo, Akihiko
AU - Morikawa, Takeshi
N1 - Funding Information:
The authors thank Dr. Naohiko Kato, Ms. Ayako Oshima, Ms. Masae Inoue, Mr. Kenichi Yagi, Mr. Kosuke Kitazumi, Mr. Satoru Kosaka, and Mr. Makoto Kondo (Toyota Central R&D Labs. Inc.) for their assistance with the experiments. The authors also thank Dr. Shunsuke Sato, Dr. Soichi Shirai, Mr. Naonari Sakamoto, and Dr. Yuichi Kato (Toyota Central R&D Labs. Inc.) for fruitful discussions. This work was partially supported by an ACT-C Grant (No. JPMJCR12ZA ) (T. M. S., K. S., and T. M.) from the Japan Science and Technology Agency (JST), and a Kakenhi Grant-in-Aid (No. 17H06440 ) for Scientific Research on Innovative Areas, ‘‘Innovations for Light-Energy Conversion (I4LEC)’’, (A. K.) from the Japan Society for the Promotion of Science (JSPS).
Publisher Copyright:
© 2022 The Authors
PY - 2022/11/5
Y1 - 2022/11/5
N2 - A visible-light-driven Z-scheme photocatalytic CO2 reduction reaction (CO2RR) to produce CO was demonstrated using an aqueous particulate dispersion containing two bare semiconductors, (CuGa)0.3Zn1.4S2 for CO2RR and BiVO4 for water oxidation. The semiconductors were mixed with a water-soluble cobalt tris(dimethylbipyridine) complex. The CO selectivity was 98% (against H2), and the rate of CO generation was 1–2 orders of magnitude higher than those of previously-reported aqueous suspension photocatalytic systems. O2 was continuously evolved, and isotope tracer analyses confirmed that CO2 was the carbon source for CO. Experimental studies and calculations suggest that the Co complex acts dual-functionally in synergy with (CuGa)0.3Zn1.4S2 and BiVO4: it behaves as an efficient ionic electron mediator, and also acts as a new active CO2RR cocatalyst after a structural change by accepting photoexcited electrons from (CuGa)0.3Zn1.4S2. This simple method, operating in a self-optimizing manner in solution, has great potential to help achieve sustainable, highly active artificial photosynthetic systems.
AB - A visible-light-driven Z-scheme photocatalytic CO2 reduction reaction (CO2RR) to produce CO was demonstrated using an aqueous particulate dispersion containing two bare semiconductors, (CuGa)0.3Zn1.4S2 for CO2RR and BiVO4 for water oxidation. The semiconductors were mixed with a water-soluble cobalt tris(dimethylbipyridine) complex. The CO selectivity was 98% (against H2), and the rate of CO generation was 1–2 orders of magnitude higher than those of previously-reported aqueous suspension photocatalytic systems. O2 was continuously evolved, and isotope tracer analyses confirmed that CO2 was the carbon source for CO. Experimental studies and calculations suggest that the Co complex acts dual-functionally in synergy with (CuGa)0.3Zn1.4S2 and BiVO4: it behaves as an efficient ionic electron mediator, and also acts as a new active CO2RR cocatalyst after a structural change by accepting photoexcited electrons from (CuGa)0.3Zn1.4S2. This simple method, operating in a self-optimizing manner in solution, has great potential to help achieve sustainable, highly active artificial photosynthetic systems.
KW - CO reduction
KW - Metal-complex
KW - Photocatalysis
KW - Semiconductor
KW - Z-scheme
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U2 - 10.1016/j.apcatb.2022.121600
DO - 10.1016/j.apcatb.2022.121600
M3 - Article
AN - SCOPUS:85132856175
SN - 0926-3373
VL - 316
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121600
ER -