Active, stable and low-cost oxygen evolution reaction (OER) catalyst for electrochemical water splitting is key to efficient energy conversion and storage. Here, we report a three-dimensional (3D) nanonetwork as noble-metal-free electrode consisting of nickel cobalt diselenide (NiCoSe) nanobrush arrays on Ni foam (NF) through the initial hydrothermal reaction and subsequent thermal selenization process. Introducing ammonium fluoride as surface controller, different NiCoSe hierarchical architecture can be modulated from nanorods, nanobrush to nanosheets. The unique brush-like NiCoSe possesses high surface area for mass transfer, rough surface with rich active sites, 3D nanostructure preventing the accumulation of O bubbles. Compared to NiCoSe nanorods/NF, NiCoSe nanosheets/NF and commercial RuO, NiCoSe nanobrush/NF exhibits an enhanced OER performance in alkaline media to reach a low overpotential of 274mV at the current density of 10mA/cm, small Tafel slope and a long-term stability. The developed 3D nanonetwork highlights the nanoscale engineering and offers a promising alternative to noble metal catalysts for electrochemical water oxidation.
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