气候变化领域集成服务门户(CCPortal): Photoelectrochemical CO2 reduction to adjustable syngas on grain-boundary-mediated a-Si/TiO2/Au photocathodes with low onset potentials

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DOI	10.1039/c8ee02768d
	Photoelectrochemical CO2 reduction to adjustable syngas on grain-boundary-mediated a-Si/TiO2/Au photocathodes with low onset potentials
	Li C.; Wang T.; Liu B.; Chen M.; Li A.; Zhang G.; Du M.; Wang H.; Liu S.F.; Gong J.
发表日期	2019
ISSN	17545692
起始页码	923
结束页码	928
卷号	12 期号:3
英文摘要	A photoelectrochemical (PEC) CO2 reduction reaction (CRR) in an aqueous medium is among the most promising methods to produce renewable fuels with the sun and water as the energy and electron source. But a high negative bias remains a prerequisite to achieve an appreciable conversion at present due to the large overpotential of CO2 reduction. This communication describes a PEC CRR with low onset potential on an amorphous silicon (a-Si) photocathode decorated with grain-boundary-rich gold catalysts. Syngas, with high throughput and desirable CO/H2 ratios such as 1:2 and 1:1, was produced in a wide PEC range from the equilibrium potential E0(CO2/CO) of -0.1 V vs. the reversible hydrogen electrode (VRHE) to as positive as 0.4 VRHE, leading to a half-cell conversion efficiency of 0.42%. This performance represents the highest half-cell efficiency and lowest onset potential for CO2 reduction ever reported among aqueous PEC cathodes under 1 sun illumination. The a-Si/TiO2/Au photocathodes exhibit excellent stability in a wide potential range, with a high CO mass activity up to 180 ampere per gram of gold at -0.1 VRHE. Controlling the grain boundary provides powerful potential to adjust the product selectivity in PEC CO2 reduction. © 2019 The Royal Society of Chemistry.
英文关键词	Carbon dioxide; Field emission cathodes; Gold; Grain boundaries; Photocathodes; Photoelectrochemical cells; Synthesis gas; Amorphous silicon (a-Si); Equilibrium potentials; High throughput; Photoelectrochemicals; Product selectivities; Renewable fuels; Reversible hydrogen electrodes; Sun illumination; Amorphous silicon; carbon dioxide; electrochemistry; electrode; gold; grain boundary; hydrogen; photochemistry; silicon; titanium
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189958
作者单位	Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China; IChEM, Dalian Institute of Chemical Physics, Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian, 116023, China
推荐引用方式 GB/T 7714	Li C.,Wang T.,Liu B.,et al. Photoelectrochemical CO2 reduction to adjustable syngas on grain-boundary-mediated a-Si/TiO2/Au photocathodes with low onset potentials[J],2019,12(3).
APA	Li C..,Wang T..,Liu B..,Chen M..,Li A..,...&Gong J..(2019).Photoelectrochemical CO2 reduction to adjustable syngas on grain-boundary-mediated a-Si/TiO2/Au photocathodes with low onset potentials.Energy & Environmental Science,12(3).
MLA	Li C.,et al."Photoelectrochemical CO2 reduction to adjustable syngas on grain-boundary-mediated a-Si/TiO2/Au photocathodes with low onset potentials".Energy & Environmental Science 12.3(2019).