CoSe(2) nanobelt coupled with CoMoO(4) nanosheet as efficient electrocatalysts for hydrogen and oxygen evolution reaction

Designing non-noble electrocatalysts with low-cost and efficient is crucial to the development of sustainable and clean energy resources. Here, we synthesized a novel S–CoSe(2)/CoMoO(4) and O–CoSe(2)/CoMoO(4)hybrid electrocatalysts for the HER and OER, respectively. Possibly due to the synergetic chemical coupling effects between CoSe(2)/DETA and CoMoO(4), and the introduction of S heteroatom and oxygen vacancy, this hybrid could expose enough active edges, and then promoted the constructed hybrid displayed superior hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalytic performance. The S–CoSe(2)/CoMoO(4) sample afforded a current density of 10 ​mAcm(-2) at a small overpotential of 177 ​mV and a small Tafel slope of 54 ​mV dec(−1). Moreover, the oxidized CoSe(2)/CoMoO(4) (O–CoSe(2)/CoMoO(4)) also displayed a remarkable catalytic property for OER with a small Tafel slope of 43 ​mV dec(−1), as well as excellent stability in 1.0 ​M KOH. Therefore, this noble-metal-free and highly efficient catalyst enables prospective applications for electrochemical applications.