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5 years ago

Nickel Diselenide Ultrathin Nanowires Decorated with Amorphous Nickel Oxide Nanoparticles for Enhanced Water Splitting Electrocatalysis

Nickel Diselenide Ultrathin Nanowires Decorated with Amorphous Nickel Oxide Nanoparticles for Enhanced Water Splitting Electrocatalysis
Li Song, Haozhou Yang, Xiaobin Xu, Haoyi Li, Xun Wang, Haifeng Lin, Shuangming Chen
Well-designed hybrid materials based on noble metal-free elements have great potential to generate hydrogen (H2) and oxygen (O2) sustainably via overall water splitting for developing practical energy-related technologies. Herein, an accessible method is presented to synthesize nickel diselenide (NiSe2) ultrathin nanowires decorated with amorphous nickel oxide nanoparticles (NiOx NPs) as multifunctional electrocatalysts (NSWANs) for hydrogen and oxygen evolution reaction (HER and OER). The NSWANs exhibit quite low HER and OER overpotentials of 174 and 295 mV, respectively, holding the current density of 20 mA cm−2 for 24 h continuous operations in alkaline media. Meanwhile, a cell voltage of 1.547 V at the current density of 10 mA cm−2 for overall water splitting has been achieved by the NSWANs for the practical application, which could maintain fascinating activity of 20 mA cm−2 for 72 h without degradation. The decorated NiOx NPs not only prevent the NiSe2 from further oxidation but also expose requisite active sites for electrocatalytic process. It is believed that this study may provide a valuable strategy to design high-efficiency electrocatalysts and expand the applications of selenide-based materials. Hybrid nanostructures of NiSe2 ultrathin nanowires decorated with amorphous NiOx nanoparticles are fabricated to serve as highly active and ultrastable electrocatalysts for hydrogen evolution, oxygen evolution reaction, and overall water splitting. The excellent performances are likely attributed to the protection of NiOx layers on the NiSe2 to avoid further oxidation and more necessary active sites for electrocatalytic process.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701487

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