纳米点
亚稳态
材料科学
金属
相(物质)
纳米技术
化学工程
密度泛函理论
过渡金属
氢
贵金属
电催化剂
化学物理
电化学
催化作用
化学
物理化学
冶金
计算化学
电极
有机化学
工程类
作者
Wei Wang,Li Ma,Xianqiang Kong,Qi Kang,Chuan Ding,Sai Qin,Pingying Tang,Tao Xu,Hengchang Bi,Litao Sun
标识
DOI:10.1016/j.mtnano.2022.100209
摘要
Hydrogen evolution reaction (HER), an efficient and sustainable method for clean hydrogen energy producing, has been impeded by scarcity and costly of precious metals electrocatalysts. Two-dimensional (2D) metallic phase MoS2 (M-MoS2) nanosheets (NSs) have been identified as cost-effective and efficient alternative electrocatalysts for HER. However, the practical applications of M-MoS2 NSs are often limited by the metastable property of their metallic phase. Here, we demonstrate both the metallic phase stability and the electrocatalytic activity of the M-MoS2 NSs can be dramatically improved by gold (Au) nanodots (NDs) decoration. The obtained Au NDs decorated M-MoS2 NSs (namely, Au [email protected]2 NSs) maintain well their metallic phase even after about 100 days storage, while the M-MoS2 NSs have already transferred to dominant 2H phase one for about 2 weeks. The results of first-principles density functional theory (DFT) calculation also indicate that the Au NDs modification can stabilize the metastable metallic phase of M-MoS2 NSs. Moreover, the as-prepared Au [email protected]2 NSs also show remarkable enhanced electrocatalytic activity toward HER. These findings may open up an ideal approach to stabilize and activate the metastable metallic phase 2D transition metal dichalcogenides-based electrocatalysts for various promising applications.
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