气候变化领域集成服务门户(CCPortal): Rapid flame doping of Co to WS2 for efficient hydrogen evolution

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DOI	10.1039/c8ee01111g
	Rapid flame doping of Co to WS2 for efficient hydrogen evolution
	Shi X.; Fields M.; Park J.; McEnaney J.M.; Yan H.; Zhang Y.; Tsai C.; Jaramillo T.F.; Sinclair R.; Nørskov J.K.; Zheng X.
发表日期	2018
ISSN	17545692
起始页码	2270
结束页码	2277
卷号	11 期号:8
英文摘要	Transition metal sulfides have been widely studied as electrocatalysts for the hydrogen evolution reaction (HER). Though elemental doping is an effective way to enhance sulfide activity for the HER, most studies have only focused on the effect of doping sulfide edge sites. Few studies have investigated the effect of doping the basal plane or the effect of doping concentration on basal plane activity. Probing the dopant concentration dependence of HER activity is challenging due to experimental difficulties in controlling dopant incorporation. Here, we overcome this challenge by first synthesizing doped transition metal oxides and then sulfurizing the oxides to sulfides, yielding core/shell Co-doped WS2/W18O49 nanotubes with a tunable amount of Co. Our combined density functional theory (DFT) calculations and experiments demonstrate that the HER activity of basal plane WS2 changes non-monotonically with the concentration of Co due to local changes in the binding energy of H and the formation energy of S-vacancies. At an optimal Co doping concentration, the overpotential to reach -10 mA cm-2 is reduced by 210 mV, and the Tafel slope is reduced from 122 to 49 mV per decade (mV dec-1) compared to undoped WS2 nanotubes. © 2018 The Royal Society of Chemistry.
英文关键词	Binding energy; Density functional theory; Doping (additives); Electrocatalysts; Hydrogen; Nanotubes; Sulfur compounds; Transition metal oxides; Tungsten compounds; Yarn; Dopant concentrations; Dopant incorporation; Effect of doping; Experimental difficulties; Formation energies; Hydrogen evolution; Hydrogen evolution reactions; Transition metal sulfides; Cobalt; catalysis; catalyst; cobalt; concentration (composition); experimental study; hydrogen; inorganic compound; nanotube; transition element
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/190158
作者单位	Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States; Department of Chemical Engineering, Stanford University, Stanford, CA 94305, United States; Department of Material Science and Engineering, Stanford University, Stanford, CA 94305, United States; SLAC National Accelerator Laboratory, Menlo Park, CA 94025, United States
推荐引用方式 GB/T 7714	Shi X.,Fields M.,Park J.,et al. Rapid flame doping of Co to WS2 for efficient hydrogen evolution[J],2018,11(8).
APA	Shi X..,Fields M..,Park J..,McEnaney J.M..,Yan H..,...&Zheng X..(2018).Rapid flame doping of Co to WS2 for efficient hydrogen evolution.Energy & Environmental Science,11(8).
MLA	Shi X.,et al."Rapid flame doping of Co to WS2 for efficient hydrogen evolution".Energy & Environmental Science 11.8(2018).