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CoSe2 nanobelt coupled with CoMoO4 nanosheet as efficient electrocatalysts for hydrogen and oxygen evolution reaction

ABSTRACT: 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–CoSe2/CoMoO4 and O–CoSe2/CoMoO4hybrid electrocatalysts for the HER and OER, respectively. Possibly due to the synergetic chemical coupling effects between CoSe2/DETA and CoMoO4, 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–CoSe2/CoMoO4 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 CoSe2/CoMoO4 (O–CoSe2/CoMoO4) 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. Graphical abstract Owing to the synergetic coupling effects between CoSe2/DETA and CoMoO4, and the introduction of S heteroatom and oxygen vacancy, this hybrid could expose enough active edges, and then improved the intrinsic activity of the constructed hybrid for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).Image 1 Highlights • The novel S-CoSe2/CoMoO4 and O-CoSe2/CoMoO4 hybrid electrocatalysts are reported.• The oxygen vacancy resulted in O-CoSe2/CoMoO4 displayed excellent stability for OER.• This non-noble based electrocatalysts are valuable for the future clean energy.

SUBMITTER: Zhou Q

PROVIDER: S-EPMC9488072 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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