期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 10, 页码 12746-12754出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b01887
关键词
Hydrazine oxidation reaction; Hydrogen evolution reaction; Nanoporous NiCu; Galvanostatic electrodeposition; Dealloying; Normalization processing
资金
- National Natural Science Foundation of China [21273144, 21603134]
- Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ2023]
- Australian Research Council Discovery [FT170100224, DP160103107]
Hindered by sluggish kinetics and large overvoltages of direct hydrazine oxidation, energy-efficient electrolytic hydrogen generation from whole cell hydrazine electrolysis still remains a great challenge. Herein, we present a 3D hierarchically nanotubular Ni-Cu alloy on nickel foam (Ni(Cu)/NF) and demonstrate its high efficiency and strong durability for the hydrazine oxidation reaction (HzOR) with a required potential of merely 86 mV to afford a current density of 100 mA cm(-2) in alkaline hydrazine aqueous solution. The normalization of HzOR polarization curves for Ni(Cu)/NF manifests that the superlarge electrochemical active surface area (ECSA) with an 18-fold increase is the main contributor to the excellent HzOR performance. The superior cell performance makes Ni(Cu)/NF a good alternative transition-metal-based electrocatalyst for utilization in the HzOR electrolyzer. The remarkable performance toward the hydrogen evolution reaction (HER) of Ni(Cu)/NF allows the use of a superior bifunctional electrocatalyst for electrolytic hydrogen production via HzOR and HER. In a two-electrode electrolyzer cell employing Ni(Cu)/NF to function as the cathode and anode, an extremely low cell voltage of 0.41 V is required to afford 100 mA cm(-2) with remarkable long-term stability.
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