Active edge sites in MoSe2 and WSe2 catalysts for the hydrogen evolution reaction: a density functional study

被引:448
作者
Tsai, Charlie [1 ,2 ]
Chan, Karen [1 ,2 ]
Abild-Pedersen, Frank [2 ]
Norskov, Jens K. [1 ,2 ]
机构
[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA
[2] SLAC Natl Accelerator Lab, SUNCAT Ctr Interface Sci & Catalysis, Menlo Pk, CA 94025 USA
基金
美国国家科学基金会;
关键词
MOLYBDENUM; SURFACE; ADSORPTION; INTERCALATION; ENERGETICS; TANTALUM; GRAPHENE; NIOBIUM;
D O I
10.1039/c4cp01237b
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
MoSe2 and WSe2 nanofilms and nanosheets have recently been shown to be active for electrochemical H-2 evolution (HER). In this work, we used periodic density functional theory to investigate the origin of the catalytic activity on these materials. We determined the relevant structures of the Mo/W-edges and the Se-edges under HER conditions and their differential hydrogen adsorption free energies. The Mo-edge on MoSe2 and the Se-edge on both MoSe2 and WSe2 are found to be the predominantly active facets for these catalysts, with activity predicted to be comparable to or better than MoS2. On the other hand, the (0001) basal planes are found to be inert. We further explain the enhanced activity at the edges in terms of localized edge states, which provide insight into the trends in HER activity seen between the two catalysts. Our results thus suggest that an optimal catalyst design should maximize the exposure of edge sites. Comparisons are also made between the transition metal selenide catalysts and their sulfide counterparts in order to understand the consequences of having either Mo/W or Se/S atoms. It is found that linear scaling relations describe the S/Se binding onto the edge and the H binding onto the S/Se.
引用
收藏
页码:13156 / 13164
页数:9
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