摘要
为了解决MoSe_(2)导电性差和活性位点有限的问题,通过简便水热工艺合成具有缺陷的三元MoS_(x)Se_(2−x)纳米片。结果表明,硫元素的引入,不仅提高了其电子转移能力,而且提供了更多的电催化活性位点。因此,优化后S/Se摩尔比为1:1的MoS_(x)Se_(2-x)(MoSSe)具有优异的电催化析氢(HER)性能,其Tafel斜率仅为47 mV/dec,在−10 mA/cm^(2)下具有较低的过电位(−165 mV),并且具有良好的耐久性。这项工作为更好地理解多因素调控在设计和合成MoSe_(2)基催化剂以提高其电化学活性方面提供了一条额外的途径。
To solve the poor conductivity and limited active sites of MoSe_(2),ternary MoS_(x)Se_(2−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 MoS_(x)Se_(2−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/cm^(2)as well as good durability.This work provides an additional route for better understanding the modulation of multi-factors in designing and synthesizing MoSe_(2)-based catalysts to improve their electrochemical activity.
作者
史海燕
汪异
王德志
Hai-yan SHI;Yi WANG;De-zhi WANG(School of Materials Science and Engineering,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
基金
This work was supported by the Natural Science Foundation of Hunan Province,China(No.2020JJ4730).
