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Facile Preparation of 1T/2H‐Mo(S 1‐x Se x ) 2 Nanoparticles for Boosting Hydrogen Evolution Reaction

2019; Wiley; Volume: 11; Issue: 8 Linguagem: Inglês

10.1002/cctc.201900095

1867-3899

Zhiping Lin, Bo Lin, Zongpeng Wang, Shougang Chen, Chengwei Wang, Mengyao Dong, Qiang Gao, Qian Shao, Tao Ding, Hu Liu, Shide Wu, Zhanhu Guo,

2D Materials and Applications

Abstract 2D transition metal dichalcogenides with a formula MoX 2 (X=S or Se) have been explored as promising earth‐abundant catalysts for hydrogen evolution reaction (HER), especially those with 1T phases. Theoretical calculations and experiments have indicated that optimal catalytic performance can be achieved by regulating the atomic ratio of S and Se in Mo(S 1‐ x Se x ) 2 . However, the preparation of 1T phase Mo(S 1‐ x Se x ) 2 is challenging because of the differences of S and Se elements. Here, we propose a facile and effective hydrothermal method for the production of 1T/2H Mo(S 1‐ x Se x ) 2 , with which products with various x values are prepared. The as‐prepared Mo(S 1‐ x Se x ) 2 samples give a low Tafel slope of 42.8 mV dec −1 ( x =0.25), and an overpotential of 161 mV ( x =0.5), which are state‐of‐the‐art among the tremendous MoX 2 works. The excellent electrocatalytic performance is derived from the coexistence of S and Se atoms which reduces the reaction potential energy, and the presence of the 1T phase which improves the conductivity. Additionally, the ratio of 1T phase to 2H phase of Mo(S 1‐ x Se x ) 2 is found controllable over reaction temperature.