Two-Dimensional MoS2 Confined Co(OH)(2) Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes

doi:10.1021/acsnano.8b00942

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	Two-Dimensional MoS2 Confined Co(OH)(2) Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes
	Luo, YT ; Li, X 1; Cai, XK ; Zou, XL ; Kang, FY ; Cheng, HM ; Liu, BL
刊名	ACS NANO
	2018-05-01
卷号	12 期号:5 页码:4565-4573
关键词	hydrogen evolution reaction alkaline media nanoconfinement two-dimensional materials MoS2 Co(OH)(2) density functional theory
ISSN号	1936-0851
DOI	10.1021/acsnano.8b00942
英文摘要	The development of abundant and cheap electrocatalysts for the hydrogen evolution reaction (HER) has attracted increasing attention over recent years. However, to achieve low-cost HER electrocatalysis, especially in alkaline media, is still a big challenge due to the sluggish water dissociation kinetics as well as the poor long-term stability of catalysts. In this paper we report the design and synthesis of a two-dimensional (2D) MoS2 confined Co(OH)(2) nanoparticle electrocatalyst, which accelerates water dissociation and exhibits good durability in alkaline solutions, leading to significant improvement in HER performance. A two-step method was used to synthesize the electrocatalyst, starting with the lithium intercalation of exfoliated MoS2 nanosheets followed by Co2+ exchange in alkaline media to form MoS2 intercalated with Co(OH)(2) nanoparticles (denoted Co-Ex-MoS2), which was fully characterized by spectroscopic studies. Electrochemical tests indicated that the electrocatalyst exhibits superior HER activity and excellent stability, with an onset overpotential and Tafel slope as low as 15 mV and 53 mV dec(-1), respectively, which are among the best values reported so far for the Pt-free HER in alkaline media. Furthermore, density functional theory calculations show that the cojoint roles of Co(OH)(2) nanoparticles and MoS2 nanosheets result in the excellent activity of the Co-Ex-MoS2 electrocatalyst, and the good stability is attributed to the confinement of the Co(OH)(2) nanoparticles. This work provides an imporant strategy for designing HER electrocatalysts in alkaline solutions, and can, in principle, be expanded to other materials besides the Co(OH)(2) and MoS2 used here.
学科主题	Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
语种	英语
WOS记录号	WOS:000433404500053
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80200]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Tsinghua Univ, TBSI, Shenzhen Geim Graphene Ctr SGC, Shenzhen 518055, Peoples R China 2.Tsinghua Univ, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Luo, YT,Li, X,Cai, XK,et al. Two-Dimensional MoS2 Confined Co(OH)(2) Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes[J]. ACS NANO,2018,12(5):4565-4573.
APA	Luo, YT.,Li, X.,Cai, XK.,Zou, XL.,Kang, FY.,...&Liu, BL.(2018).Two-Dimensional MoS2 Confined Co(OH)(2) Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes.ACS NANO,12(5),4565-4573.
MLA	Luo, YT,et al."Two-Dimensional MoS2 Confined Co(OH)(2) Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes".ACS NANO 12.5(2018):4565-4573.