Copper–nickel nitride nanosheets as efficient bifunctional catalysts for hydrazine-assisted electrolytic hydrogen production

Zhaoyang Wang, Lin Xu, Fuzhi Huang, Longbing Qu, Jiantao Li, Kwadwo Asare Owusu, Ziang Liu, Zifeng Lin, Binhua Xiang, Xiong Liu, Kangning Zhao, Xiaobin Liao, Wei Yang, Yi Bing Cheng, Liqiang Mai

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30 Citations (Scopus)

Abstract

Electrocatalytic water splitting is one of the sustainable and promising strategies to generate hydrogen fuel but still remains a great challenge because of the sluggish anodic oxygen evolution reaction (OER). A very effective approach to dramatically decrease the input cell voltage of water electrolysis is to replace the anodic OER with hydrazine oxidation reaction (HzOR) due to its lower thermodynamic oxidation potential. Therefore, developing the low-cost and efficient HzOR catalysts, coupled with the cathodic hydrogen evolution reaction (HER), is tremendously important for energy-saving electrolytic hydrogen production. Herein, a new-type of copper–nickel nitride (Cu1Ni2-N) with rich Cu4N/Ni3N interface is rationally constructed on carbon fiber cloth. The 3D electrode exhibits extraordinary HER performance with an overpotential of 71.4 mV at 10 mA cm−2 in 1.0 m KOH, simultaneously delivering an ultralow potential of 0.5 mV at 10 mA cm−2 for HzOR in a 1.0 m KOH/0.5 m hydrazine electrolyte. Moreover, the electrolytic cell utilizing the synthesized Cu1Ni2-N electrode as both the cathode and anode display a cell voltage of 0.24 V at 10 mA cm−2 with an excellent stability over 75 h. The present work develops the promising copper–nickel-based nitride as a bifunctional electrocatalyst through hydrazine-assistance for energy-saving electrolytic hydrogen production.

Original languageEnglish
Article number1900390
Number of pages11
JournalAdvanced Energy Materials
Volume9
Issue number21
DOIs
Publication statusPublished - 5 Jun 2019

Keywords

  • bifunctional catalysts
  • copper–nickel nitride
  • hydrazine oxidation
  • hydrogen evolution
  • water electrolysis

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