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Nickel Diselenide Ultrathin Nanowires Decorated with Amorphous Nickel Oxide Nanoparticles for Enhanced Water Splitting Electrocatalysis
Author(s) -
Li Haoyi,
Chen Shuangming,
Lin Haifeng,
Xu Xiaobin,
Yang Haozhou,
Song Li,
Wang Xun
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201701487
Subject(s) - diselenide , water splitting , electrocatalyst , oxygen evolution , materials science , nickel , nanotechnology , nanoparticle , amorphous solid , nanowire , oxide , chemical engineering , selenide , nickel oxide , catalysis , electrode , electrochemistry , chemistry , metallurgy , selenium , biochemistry , photocatalysis , organic chemistry , engineering
Well‐designed hybrid materials based on noble metal‐free elements have great potential to generate hydrogen (H 2 ) and oxygen (O 2 ) sustainably via overall water splitting for developing practical energy‐related technologies. Herein, an accessible method is presented to synthesize nickel diselenide (NiSe 2 ) ultrathin nanowires decorated with amorphous nickel oxide nanoparticles (NiO x 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 NiO x NPs not only prevent the NiSe 2 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.