Acid-engineered defective MoS_2 as an efficient electrocatalyst for hydrogen evolution reaction

摘要

Here we report a dramatically enhanced hydrogen evolution reaction (HER) catalyst by acid etched MoS2 (A-MoS2). For the etching and oxidation effects of HNO3, the active site and electrical transport are significantly improved by simply controlling of processing time. The A-MoS2 exhibits promising electrocatalytic performance, including much smaller onset overpotential (similar to 80 mV), an overpotential of 210 mV at 10 mA/cm(2), and a Tafel slope of 97 mV/dec (the pristine MoS2 180 mV/dec). The enhanced HER performance of MoS2 may be attributed to the increased edge S atoms and the charge induced by the O doping. (C) 2018 Elsevier B.V. All rights reserved.