Facile synthesis of flower-like MoSxSe2-x nanocomposites for efficient hydrogen evolution
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)
2. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract: To solve the poor conductivity and limited active sites of MoSe2, ternary MoSxSe2-x nanosheets with defects were synthesized by a convenient hydrothermal process. The results showed that the introduction of S element not only improved the electron transfer ability, but also provided more electrocatalytic active sites. Consequently, the optimized MoSxSe2-x with a S/Se molar ratio of 1:1 (MoSSe) presented superior electrocatalytic hydrogen evolution reaction performance with a low Tafel slope of 47 mV/dec, and a small overpotential of -165 mV at -10 mA/cm2 as well as good durability. This work provides an additional route for better understanding the modulation of multi-factors in designing and synthesizing MoSe2-based catalysts to improve their electrochemical activity.
Key words: ternary MoSxSe2-x alloy; defect; synergistic effect; electrocatalyst; hydrogen evolution