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Article Abstract
The preparation of efficient and stable bifunctional electrocatalysts for electrochemical overall water splitting (OWS) to scale up commercial hydrogen production remains a great challenge. Here, we synthesized heterojunction structures consisting of CoS/NiS nanowire arrays and amorphous goethite (FeOOH, α-phase) particles as efficient OWS catalysts using an interface engineering strategy. The interfacial charge inhomogeneity caused by the heterojunction contact leads to the generation of a built-in electric field, which makes the electron-deficient FeOOH and electron-rich CoS/NiS favorable for hydrogen/oxygen evolution reaction, respectively, thus ensuring the excellent activity of FeOOH/CoS/NiS as a bifunctional catalyst. FeOOH/CoS/NiS exhibits impressive catalytic activity for the oxygen evolution reaction, achieving an ultralarge current density of 1000 mA cm needed as low as 265 mV overpotential, and its stability was tested up to 1440 h. Furthermore, an excellent OWS output (1.55 V to generate 10 mA cm) is achieved by the bifunctional FeOOH/CoS/NiS catalysts.
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