气候变化领域集成服务门户(CCPortal): Si photocathode with Ag-supported dendritic Cu catalyst for CO2 reduction

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DOI	10.1039/c8ee03547d
	Si photocathode with Ag-supported dendritic Cu catalyst for CO2 reduction
	Gurudayal; Beeman J.W.; Bullock J.; Wang H.; Eichhorn J.; Towle C.; Javey A.; Toma F.M.; Mathews N.; Ager J.W.
发表日期	2019
ISSN	17545692
起始页码	1068
结束页码	1077
卷号	12 期号:3
英文摘要	Si photocathodes integrated with Ag-supported dendritic Cu catalysts are used to perform light-driven reduction of CO2 to C2 and C3 products in aqueous solution. A back illumination geometry with an n-type Si absorber was used to permit the use of absorbing metallic catalysts. Selective carrier collection was accomplished by a p+ implantation on the illumination side and an n+ implantation followed by atomic layer deposition of TiO2 on the electrolyte site. The Ag-supported dendritic Cu CO2 reduction catalyst was formed by evaporation of Ag followed by high-rate electrodeposition of Cu to form a high surface area structure. Under simulated 1 sun illumination in 0.1 M CsHCO3 saturated with CO2, the photovoltage generated by the Si (∼600 mV) enables C2 and C3 products to be produced at -0.4 vs. RHE. Texturing of both sides of the Si increases the light-limited current density, due to reduced reflection on the illumination side, and also deceases the onset potential. Under simulated diurnal illumination conditions photocathodes maintain over 60% faradaic efficiency to hydrocarbon and oxygenate products (mainly ethylene, ethanol, propanol) for several days. After 10 days of testing, contamination from the counter electrode is observed, which causes an increase in hydrogen production. This effect is mitigated by a regeneration procedure which restores the original catalyst selectivity. A tandem, self-powered CO2 reduction device was formed by coupling a Si photocathode with two series-connected semitransparent CH3NH3PbI3 perovskite solar cells, achieving an efficiency for the conversion of sunlight to hydrocarbons and oxygenates of 1.5% (3.5% for all products). © 2019 The Royal Society of Chemistry.
英文关键词	Atomic layer deposition; Carbon dioxide; Catalyst selectivity; Cesium compounds; Copper; Efficiency; Electrolytes; Ethylene; Field emission cathodes; Hydrogen production; Perovskite; Perovskite solar cells; Photocathodes; Silicon; Solar cells; Titanium dioxide; Back illumination; Carrier collection; Counter electrodes; Faradaic efficiencies; High surface area; Illumination conditions; Metallic catalysts; Series-connected; Catalyst supports; aqueous solution; carbon dioxide; catalyst; copper; efficiency measurement; electrode; electrolyte; energy efficiency; evaporation; fuel cell; hydrocarbon; inorganic compound; perovskite; reduction; silica
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/189953
作者单位	Joint Center for Artificial Photosynthesis and Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States; Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA 94720, United States; Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States; Department of Electrical Engineering and Computer Science, University of California Berkeley, Berkeley, CA 94720, United States; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Energy Research Institute at NTU (ERIatN), Research Techno Plaza, X-Frontier Block, Level 5, 5 Nanyang Drive, Singapore, 637553, Singapore
推荐引用方式 GB/T 7714	Gurudayal,Beeman J.W.,Bullock J.,et al. Si photocathode with Ag-supported dendritic Cu catalyst for CO2 reduction[J],2019,12(3).
APA	Gurudayal.,Beeman J.W..,Bullock J..,Wang H..,Eichhorn J..,...&Ager J.W..(2019).Si photocathode with Ag-supported dendritic Cu catalyst for CO2 reduction.Energy & Environmental Science,12(3).
MLA	Gurudayal,et al."Si photocathode with Ag-supported dendritic Cu catalyst for CO2 reduction".Energy & Environmental Science 12.3(2019).