General Thermal Texturization Process of MoS2 for Efficient Electrocatalytic Hydrogen Evolution Reaction

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• 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
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：4047-4053
• 全文大小：561K
• 年卷期：0
• ISSN：1530-6992

文摘

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.