Band structure engineering of W replacement in ReSe 2 nanosheets for enhancing hydrogen evolution.

Layered transition metal dichalcogenide rhenium selenide (ReSe 2 ) has attracted great attention as an electrocatalyst for the hydrogen evolution reaction (HER) due to its excellent stability and sufficient active sites. However, ReSe 2 has intrinsically poor conductivity, which leads to the insufficient utilization of electrocatalytic active sites. Herein, we designed the regulation of the electronic band structure by W replacement in ReSe 2 nanosheets to greatly improve the conductivity. The Re 0.7 W 0.3 Se 2 exhibits an overpotential of 141 mV at 10 mA cm -2 and a Tafel slope of 65.3 mV dec -1 , superior to that of the original ReSe 2 and WSe 2 . This work aims to provide a feasible strategy to promote the HER activity of ReSe 2 .