Vapor-solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

CORC > 化学研究所 > 中国科学院化学研究所 > 分子纳米结构与纳米技术实验室

	Vapor-solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis
	Li, Wei 1; Gao, Xuefei 2; Xiong, Dehua 1; Xia, Fang 3; Liu, Jian 2; Song, Wei-Guo 2; Xu, Junyuan 1; Thalluri, Sitaramanjaneya Mouli 1; Cerqueira, M. F.4; Fu, Xiuli 5
刊名	CHEMICAL SCIENCE
	2017
卷号	8 期号:4 页码:2952-2958
英文摘要	Electrochemical water splitting into hydrogen and oxygen is a promising technology for sustainable energy storage. The development of earth-abundant transition metal phosphides (TMPs) to catalyze the hydrogen evolution reaction (HER) and TMP-derived oxy-hydroxides to catalyze the oxygen evolution reaction (OER) has recently drawn considerable attention. However, most monolithically integrated metal phosphide electrodes are prepared by laborious multi-step methods and their operational stability at high current densities has been rarely studied. Herein, we report a novel vapor-solid synthesis of single-crystalline cobalt phosphide nanowires (CoP NWs) on a porous Co foam and demonstrate their use in overall water splitting. The CoP NWs grown on the entire surface of the porous Co foam ligaments have a large aspect ratio, and hence are able to provide a large catalytically accessible surface over a given geometrical area. Comprehensive investigation shows that under the OER conditions CoP NWs are progressively and conformally converted to CoOOH through electrochemical in situ oxidation/dephosphorization; the latter serving as an active species to catalyze the OER. The in situ oxidized electrode shows exceptional electrocatalytic performance for the OER in 1.0 M KOH, delivering 100 mA cm(-2) at an overpotential (eta) of merely 300 mV and a small Tafel slope of 78 mV dec(-1) as well as excellent stability at various current densities. Meanwhile, the CoP NW electrode exhibits superior catalytic activity for the HER in the same electrolyte, affording -100 mA cm(-2) at eta = 244 mV and showing outstanding stability. An alkaline electrolyzer composed of two symmetrical CoP NW electrodes can deliver 10 and 100 mA cm(-2) at low cell voltages of 1.56 and 1.78 V, respectively. The CoP NW electrolyzer demonstrates exceptional long-term stability for overall water splitting, capable of working at 20 and 100 mA cm(-2) for 1000 h without obvious degradation.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38246]
专题	化学研究所_分子纳米结构与纳米技术实验室
作者单位	1.Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal 2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China 3.Murdoch Univ, Sch Engn & Informat Technol, Murdoch, WA 6150, Australia 4.Univ Minho, Ctr Phys, P-4710057 Braga, Portugal 5.Beijing Univ Posts & Telecommun, Sch Sci, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
推荐引用方式 GB/T 7714	Li, Wei,Gao, Xuefei,Xiong, Dehua,et al. Vapor-solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis[J]. CHEMICAL SCIENCE,2017,8(4):2952-2958.
APA	Li, Wei.,Gao, Xuefei.,Xiong, Dehua.,Xia, Fang.,Liu, Jian.,...&Liu, Lifeng.(2017).Vapor-solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis.CHEMICAL SCIENCE,8(4),2952-2958.
MLA	Li, Wei,et al."Vapor-solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis".CHEMICAL SCIENCE 8.4(2017):2952-2958.