Fabrication of CoS2-MoS2 heterostructure via interface engineering toward efficient dual-pH hydrogen evolution

Modulation of electronic structure via heterointerface engineering is regarded as an appealing strategy to promote the hydrogen evolution reaction (HER) performance of a pH-universal electrocatalyst. Herein, the CoS2-MoS2 heterostructure is synthesized, where MoS2 nanosheets are vertically anchored on CoS2 mi-croflakes. Plentiful heterogeneous nanointerfaces generated between MoS2 and CoS2 phases not only provide sufficient electroactive sites and structural defects, but also afford a hierarchically porous structure. The synergistic modulation of electronic and geometric structures accounts for a superb catalytic activity and long-durability of CoS2-MoS2 toward HER in acidic and alkaline solutions simultaneously, in terms of the overpotential in 0.5 M H2SO4 (218 mV versus RHE) and 1.0 M KOH (251 mV) at a current density of 10 mA cm-2. This work offers an exciting avenue for fabricating transition metal sulfides as efficient wide-pH electrocatalysts through an interface-induced strategy.(c) 2023 Published by Elsevier B.V.