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Citation: Liangfeng Chen, Zhuo Wang, Peng Kang. Efficient photoelectrocatalytic CO₂ reduction by cobalt complexes at silicon electrode[J]. Chinese Journal of Catalysis, ;2018, 39(3): 413-420. doi: 10.1016/S1872-2067(17)62993-0 shu

Efficient photoelectrocatalytic CO₂ reduction by cobalt complexes at silicon electrode

Liangfeng Chen ^a,b, ,
Zhuo Wang ^a ,
Peng Kang ^a,b

a Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
b University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 15 October 2017
Revised Date: 17 November 2017

Fund Project: This work was supported by the National Key R&D Program of China (2016YFB0600901) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17030300).

Two homogeneous photoelectrocatalytic systems composed of simple polypyridyl Co complexes[Co(tpy)₂](PF₆)₂ and[Co(bpy)₃](PF₆)₂ as electrocatalysts and a Si wafer as the photoelectrode were used for combined photoelectrochemical reduction of CO₂ to CO. A high photocurrent density of 1.4 mA/cm² was observed for the system with the[Co(tpy)₂](PF₆)₂ catalyst and a photovoltage of 400 mV was generated. Faradaic efficiencies of CO were optimized to 83% and 94% for the[Co(tpy)₂](PF₆)₂ and[Co(bpy)₃](PF₆)₂ complexes, respectively, in acetonitrile solution with 10% methanol (volume fraction, same below) as a protic additive. Addition of 2% water volume fraction induced a large amount of non-specific H₂ evolution by the Si photoelectrode.
- Photoelectrocatalytic system,
- Molecular electrocatalyst,
- Carbon dioxide reduction,
- Carbon monoxide,
- Polypyridine complex
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Efficient photoelectrocatalytic CO₂ reduction by cobalt complexes at silicon electrode