Citation: Rui Xiang, Cheng Tong, Yao Wang, Lishan Peng, Yao Nie, Li Li, Xun Huang, Zidong Wei. Hierarchical coral-like FeNi(OH)_x/Ni via mild corrosion of nickel as an integrated electrode for efficient overall water splitting[J]. Chinese Journal of Catalysis, ;2018, 39(11): 1736-1745. doi: 10.1016/S1872-2067(18)63150-X shu

Hierarchical coral-like FeNi(OH)_x/Ni via mild corrosion of nickel as an integrated electrode for efficient overall water splitting

Rui Xiang ^a, ,
Cheng Tong ^a ,
Yao Wang ^a ,
Lishan Peng ^a ,
Yao Nie ^b ,
Li Li ^a ,
Xun Huang ^a ,
Zidong Wei ^a

a Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
b College of Chemistry, Chongqing Normal University, Chongqing 400047, China

Received Date: 2 July 2018
Revised Date: 31 July 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21436003, 21576032).

Efficient, stable, and noble-metal-free electrocatalysts for both the oxygen evolution reaction and the hydrogen evolution reaction are highly imperative for the realization of low-cost commercial water-splitting electrolyzers. Herein, a cost-effective and ecofriendly strategy is reported to fabricate coral-like FeNi(OH)_x/Ni as a bifunctional electrocatalyst for overall water splitting in alkaline media. With the assistance of mild corrosion of Ni by Fe(NO₃)₃, in situ generated FeNi(OH)_x nanosheets are intimately attached on metallic coral-like Ni. Integration of these nanosheets with the electrodeposited coral-like Ni skeleton and the supermacroporous Ni foam substrate forms a binder-free hierarchical electrode, which is beneficial for exposing catalytic active sites, accelerating mass transport, and facilitating the release of gaseous species. In 1.0 mol L^-1 KOH solution, a symmetric electrolyzer constructed with FeNi(OH)_x/Ni as both the anode and the cathode exhibits an excellent activity with an applied potential difference of 1.52 V at 10 mA cm^-2, which is superior to that of an asymmetric electrolyzer constructed with the state-of-the-art RuO₂-PtC couple (applied potential difference of 1.55 V at 10 mA cm^-2). This work contributes a facile and reliable strategy for manufacturing affordable, practical, and promising water-splitting devices.
- Overall water splitting,
- Electro-catalysis,
- Fe/Ni hydroxide,
- Alkaline electrolyser,
- Integrate electrode
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Hierarchical coral-like FeNi(OH)x/Ni via mild corrosion of nickel as an integrated electrode for efficient overall water splitting

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Hierarchical coral-like FeNi(OH)_x/Ni via mild corrosion of nickel as an integrated electrode for efficient overall water splitting