Construction of FeS2@MoS2 heterostructures for enhanced hydrogen evolution†
Abstract
The exploration of cheap and high-performance electrocatalysts is the key to developing clean hydrogen energy. Although MoS2 is a good candidate to replace noble metal Pt-based electrocatalysts for the hydrogen evolution reaction (HER), the comprehensive performances are still unsatisfactory. In this work, FeS2@MoS2 heterostructures are proposed and constructed by a facile and low-cost method. Compared with single MoS2, FeS2 and their mixture (MoS2 + FeS2), the as-designed FeS2@MoS2 electrocatalyst possesses the best catalytic activity for the HER with a small Tafel slope of 58 mV dec−1 as well as good stability. The experimental and calculation results confirm that the enhanced HER performance of FeS2@MoS2 should be attributed to the more exposed active sites, better charge transfer ability, and optimized free energy of hydrogen adsorption originating from the construction of FeS2@MoS2 heterostructures.