Copper Electrode Fabricated via Pulse Electrodeposition: Toward High Methane Selectivity and Activity for CO2 Electroreduction

	Copper Electrode Fabricated via Pulse Electrodeposition: Toward High Methane Selectivity and Activity for CO2 Electroreduction
	Zhong, He-Xiang 1,3; Zhang, Hua-Min 1,3; Li, Xian-Feng 1,3; Xu, Wen-Bin 1; Zhang, Tao-Tao 1,2; Qiu, Yan-Ling 1
刊名	ACS CATALYSIS
	2017-09-01
卷号	7 期号:9 页码:6302-6310
关键词	carbon dioxide electroreduction methane Faradaic efficiency electrocatalytic activity Cu electrode pulse-electrodeposition
英文摘要	Electrochemical reduction of CO2 (ERC) to methane has significant economic benefits and represents one promising solution for energy and environmental sustain ability. However, traditional metal electrodes suffer from higher overpotentials, low activities, and poor selectivity. In this article, the pulse electrodeposition (P-ED) method is employed to prepare a copper electrode for ERC. The P-ED method can easily create Cu coatings on carbon paper with a much rougher surface and extended surface area, which is highly beneficial for improving their activity and selectivity. As a result, the prepared Cu electrodes exhibit high faradaic efficiency (of 85% at -2.8 V) and enhanced partial current density (jCH(4) = 38 mA cm(-2)) for methane, which is by far the highest value ever reported at room temperature and ambient pressure. The enhanced activity is attributed to the extended reactive areas with rough morphology and loosened coating structure to ensure CO2 access the reaction sites located at the sublayers of the deposited Cu coatings. The prominent selectivity for CH4 is likely due to the presence of a stepped surface, which is formed by introduction of Cu (100) step into Cu (111) and Cu (220) terraces during the P-ED processes. The lower resistance to the one-electron transfer to CO2, which is a pre equilibrium step prior to the rate-limiting nonelectrochemical step, is another positive factor to improve the ERC activity for CH4. Furthermore, we surprisingly find that the activity and selectivity of the Cu electrode can be easily recovered through continuous CO2 bubbling. This paper provides a facile method to prepare highly effective electrodes for electrochemical conversion of CO2.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
关键词[WOS]	ELECTROCHEMICAL REDUCTION ; CARBON-DIOXIDE ; CU NANOPARTICLES ; SINGLE-CRYSTAL ; HYDROCARBONS ; CONVERSION ; NANOWIRES ; SURFACES ; ETHYLENE ; FILMS
收录类别	SCI
语种	英语
WOS记录号	WOS:000410005700084
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/150033]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Zhongshan Rd 457, Dalian 116023, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Collaborat Innovat Ctr Chem Energy Mat iChEM, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Zhong, He-Xiang,Zhang, Hua-Min,Li, Xian-Feng,et al. Copper Electrode Fabricated via Pulse Electrodeposition: Toward High Methane Selectivity and Activity for CO2 Electroreduction[J]. ACS CATALYSIS,2017,7(9):6302-6310.
APA	Zhong, He-Xiang,Zhang, Hua-Min,Li, Xian-Feng,Xu, Wen-Bin,Zhang, Tao-Tao,&Qiu, Yan-Ling.(2017).Copper Electrode Fabricated via Pulse Electrodeposition: Toward High Methane Selectivity and Activity for CO2 Electroreduction.ACS CATALYSIS,7(9),6302-6310.
MLA	Zhong, He-Xiang,et al."Copper Electrode Fabricated via Pulse Electrodeposition: Toward High Methane Selectivity and Activity for CO2 Electroreduction".ACS CATALYSIS 7.9(2017):6302-6310.