A nanostructured MoO 2 /MoS 2 /MoP heterojunction electrocatalyst for the hydrogen evolution reaction

作者：Licheng Huang, Ying Yang, Chengxin Zhang, Hui Yu, Tingting Wang, Xiangting Dong, Dan Li, Zhelin Liu · 发表于：Nanotechnology · 年份：2020 · DOI：10.1088/1361-6528/ab767a · 被引用次数：37 · 研究领域：Electrocatalysts for Energy Conversion、Advanced battery technologies research、Fuel Cells and Related Materials

Abstract Electrocatalytic production of hydrogen from water is considered to be a promising and sustainable strategy. In this work, the low-cost nanostructured MoO 2 /MoS 2 /MoP heterojunction is successfully synthesized by phosphorization of the pre-prepared urchin-like MoO 2 /MoS 2 nanospheres as the stable, highly efficient electrocatalysis for the hydrogen evolution reaction (HER). The MoO 2 /MoS 2 /MoP-800 (MoO 2 /MoS 2 nanospheres are phosphated at 800 °C) displays a catalytic ability for the HER with an overpotential of 135 mV to achieve 10 mA cm −2 and a Tafel slope of 67 mV dec −1 in 0.5 M H 2 SO 4 , which is superior to MoO 2 /MoS 2 nanospheres (200 °C; 24 h), MoO 2 /MoS 2 /MoP-700 (MoO 2 /MoS 2 nanospheres are phosphated at 700 °C) and MoO 2 /MoS 2 /MoP-900 (MoO 2 /MoS 2 nanospheres are phosphated at 900 °C). Meanwhile, the catalyst exhibits superior properties for HER with an overpotential of 145 mV to achieve 10 mA cm −2 and a Tafel slope of 71 mV dec −1 in 1 M KOH solution. Detailed characterizations reveal that the improved HER performances are significantly related to P-doping and the spherical nanostructure. This work not only provides a low-cost selective for electrocatalytic production of hydrogen, but also serves as a guide to optimize the composition and structure of nanocomposites.