过电位
电催化剂
塔菲尔方程
分解水
析氧
电化学
作者
Daisuke Kiriya,Peter Lobaccaro,Hnin Yin Yin Nyein,Peyman Taheri,Mark Hettick,Hiroshi Shiraki,Carolin M. Sutter‐Fella,Peida Zhao,Wei Gao,Roya Maboudian,Joel W. Ager,Ali Javey
出处
期刊:Nano Letters
[American Chemical Society]
日期:2016-06-24
卷期号:16 (7): 4047-4053
被引量:98
标识
DOI:10.1021/acs.nanolett.6b00569
摘要
Molybdenum disulfide (MoS2) has been widely examined as a catalyst containing no precious metals for the hydrogen evolution reaction (HER); however, these examinations have utilized synthesized MoS2 because the pristine MoS2 mineral is known to be a poor catalyst. The fundamental challenge with pristine MoS2 is the inert HER activity of the predominant (0001) basal surface plane. In order to achieve high HER performance with pristine MoS2, it is essential to activate the basal plane. Here, we report a general thermal process in which the basal plane is texturized to increase the density of HER-active edge sites. This texturization is achieved through a simple thermal annealing procedure in a hydrogen environment, removing sulfur from the MoS2 surface to form edge sites. As a result, the process generates high HER catalytic performance in pristine MoS2 across various morphologies such as the bulk mineral, films composed of micron-scale flakes, and even films of a commercially available spray of nanoflake MoS2. The lowest overpotential (η) observed for these samples was η = 170 mV to obtain 10 mA/cm2 of HER current density.
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