摘要
Amorphous molybdenum sulfide (MoS x ) materials have been considered as cheap and promising catalysts for hydrogen evolution reaction (HER). In this contribution, we report that the amorphous MoS x catalysts prepared by the low temperature thermolysis of the (NH 4 ) 2 MoS 4 precursors on carbon clothes (catalyst loading: 3.2 mg/cm 2 ) exhibit a Tefal slope of 50.5 mV/dec and a high exchange current density of 1.5 × 10 -3 mA/cm 2 in 0.5 M H 2 SO 4 solutions. Spectroscopic studies of the amorphous MoS x catalysts show that the increase of HER efficiency is positively correlated to the concentration of S 2 2- species, providing strong evidence to support the argument that S 2 2- is an active species for electrocatalytic HER. Additionally, the method for preparing catalysts is simple, scalable and applicable for large-scale production. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. 32.