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Citation: XU Guan-Hua, WU Xin-Ping, LIU Hong-Tao, ZHU Guo-Yi. Photoelectrochemical Reduction of CO₂ on TiO₂-CuO/Cu Composite Electrode[J]. Chinese Journal of Applied Chemistry, ;2009, 26(4): 475-478. shu

Photoelectrochemical Reduction of CO₂ on TiO₂-CuO/Cu Composite Electrode

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a Xinjiang Xinye Huamei Technology Corporation, Urumqi;
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b College of Chemistry & Chemical Engineering, Central South University, Changsha 410083;
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c Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun

Corresponding author: LIU Hong-Tao,
Received Date: 25 April 2008
Available Online: 7 August 2008

TiO₂-CuO/Cu composite electrode was fabricated and used to investigate the photoelectrochemical reduction of CO₂.The photoelectrochemical measurements show that TiO₂ could effectively absorb light energy and release abundant electrons to enhance the reduction of CO₂.The TiO₂-CuO/Cu composite electrode has a good catalytic activity for reducing CO₂ under light radiation.The onset reduction potential was shifted positively from-0.9 V to-0.8 V,and at the same time,the decomposition of water was greatly suppressed.The Mott-Schottky profiles showed the composite electrode was n-type semiconductor and the flat-band potential was shifted negatively as the radiation time increased.The FT-IR and GC-MS spectroscopies proved the reducted products were mainly HCOOH and HCHO,along with a small amount of CH₄ and C₂H₄.At-1.2 V for 3 h under light radiation,the conversion rate for CO₂ reached to 32%.Based on the experimental data,the free radical reduction mechanism was proposed.
- composite electrode,
- carbon dioxide,
- photoelectrochemical reaction,
- reduction mechanism
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Photoelectrochemical Reduction of CO₂ on TiO₂-CuO/Cu Composite Electrode