Citation: SUN Qiang-Qiang, ZHOU Chun-Sheng, ZHANG Guo-Chun, WANG Zeng-Lin. Synthesis of Porous Dendritic Nickel-Copper Alloy and Electroctalytic Performances Towards Hydrogen Evolution and Hydrazine Oxidation[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(4): 703-714. doi: 10.11862/CJIC.2020.082 shu

Synthesis of Porous Dendritic Nickel-Copper Alloy and Electroctalytic Performances Towards Hydrogen Evolution and Hydrazine Oxidation

1.
Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, School of Chemical Engineering and Modern Materials, Shangluo University, Shangluo, Shaanxi 726000, China
2.
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, and School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China

Corresponding author: SUN Qiang-Qiang, sqq3c118@163.com WANG Zeng-Lin, wangzl@snnu.edu.cn
Received Date: 25 December 2019
Revised Date: 26 February 2020

Figures(8)

Herein, we report quadruple-hierarchy micro-nano structured nickel-copper alloy electrocatalysts with phase-separated metallic Ni and Cu as the main crystal phase, which were grown in situ on nickel mesh (NM) substrate by hydrogen bubble-template method. During hybrid water electrolysis, NiCu/NM electrode only requires hydrogen evolution reaction (HER) overpotential and hydrazine oxidation (HzOR) potential of 104 and 41 mV to afford 10 mA·cm^-2, respectively, in 1 mol·L^-1 KOH containing 0.5 mol·L^-1 N₂H₄·H₂O. Integrated into a hybrid cell, the NiCu/NM couple require a cell voltage of only 0.536 V to deliver a current density of 100 mA·cm^-2, far lower than that of overall water splitting (1.921 V), giving rise to the great improvement of hydrogen-producing efficiency. Whether in three-electrode or two-electrode devices, the as-obtained catalyst displays superior electrocatalytic activity and stability towards HER or HzOR. The remarkable catalytic performance is attributed to two key factors. On the one hand, multiple-hierarchy structured NiCu alloy films with 14-fold increased ECSA expose huge number of catalytic active sites and present sufficient channels for charge transfer and material transfer on the electrode surface in both HER and HzOR. On the other hand, the strong synergistic effect induced by Cu-doping brings great improvement of intrinsic HER activity of electrode materials. The both factors contribute collectively to the superior electrocatalytic performances of NiCu/NM during hybrid water splitting, and the structural advantages of the unique 3D hierarchical porous macro-nano structures are the dominant factors.
- water electrolysis,
- nickel-copper alloy,
- hydrogen bubble-template method,
- hydrogen evolution reaction,
- hydrazine oxidation
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沈阳化工大学材料科学与工程学院沈阳 110142