Magnetism Modulation of Co3S4 towards Efficient Hydrogen Evolution Reaction
Transition metal sulfides have been widely used as high-efficient and low-cost electrocatalysts for water splitting. We performed systematic first-principles studies for the structure stability, hydrogen evolution reaction activity and water dissociation of pristine and decorated Co3S4(001) surfaces. We found that the creation of one kind of S-vacancy and its substitution with Sn can be two effective ways to enhance the electrocatalytic performance of Co3S4(001) surface, as well as to drop the energy barrier for water dissociation. The mechanism behind is the appearance of high spin Co2+ atoms adjacent to the vacancy or dopant, which induce magnetism to sulfur atoms and activate more reaction sites. Our results gain insights in modulating and designing new transition metal sulfides for their applications in electrocatalysts.