Cobalt doping of FePS3 promotes intrinsic active sites for efficient hydrogen evolution reaction
Exploring earth-abundant electrocatalysts to achieve efficient hydrogen evolution reaction (HER) is important for the development of clean and renewable hydrogen energy. Herein, we focus on a representative transition metal phosphosulfides electrocatalyst FePS3. Enlightened by our theoretical calculations that Co dopant improves the H affinity on the P sites and the electrical conductivity, we prepared a series of Fe1-xCoxPS3 (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) and characterized them by XRD, ICP, XPS, Raman, SEM, TEM, EDS, resistivity, and electrochemical measurement. It is found that the overpotential can be reduced by 166 mV, and the Tafel slope drops from 170 mV/dec to 80mV/dec. This work provides new insights to optimize the electrocatalytic hydrogen evolution activity of related transition metal phosphosulfides.