摘要
A highly active and stable hybrid electrocatalyst 3D hierarchical CoS 2 nanosheets incorporated with WS 2 (CoS 2 @WS 2 ) has been developed via a one-step sulfurization method for the first time, where the contents of WS 2 can be adjusted easily. We first prove that the addition of small amounts of WS 2 enhances the hydrogen evolution reaction (HER) performance of CoS 2 , and vice versa. In other words, we validated the symmetric synergy for the HER between the Co- and W-based sulfide hybrid catalysts. In addition, we confirmed that the formation of nanointerfaces of Co-S-W between CoS 2 and WS 2 was responsible for the excellent HER activity (an overpotential of -97.2 mV at -10 mA cm -2 , a small Tafel slope of 66.0 mV dec -1 , and prominent electrochemical stability) of the hybrid electrocatalyst CoS 2 @WS 2 .