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Facilitating interface charge transfer via constructing NiO/NiCo2O4 heterostructure for oxygen evolution reaction

Guoqiang Liu1, Yuwen Cheng1, Maoqin Qiu2

  • 1School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, PR China.

Journal of Colloid and Interface Science
|April 14, 2023
PubMed
Summary

Researchers developed a novel NiO/NiCo2O4 heterojunction catalyst on nickel foam for efficient oxygen evolution reaction (OER) and water splitting. This advanced electrocatalyst shows promising performance, comparable to commercial standards, for clean hydrogen production.

Keywords:
HeterojunctionInterface charge transferMetallic featureNiO/NiCo(2)O(4)Oxygen evolution reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for hydrogen generation but is hindered by slow multielectron transfer.
  • Developing high-activity electrocatalysts is essential to overcome these limitations.

Purpose of the Study:

  • To design and synthesize nanoarray-structured NiO/NiCo2O4 heterojunction anchored on Ni foam (NiO/NiCo2O4/NF) as an efficient OER electrocatalyst.
  • To investigate the catalytic performance and mechanism of the synthesized material in an alkaline electrolyte.

Main Methods:

  • Hydrothermal and heat-treatment strategies were employed to synthesize the NiO/NiCo2O4/NF material.
  • Density Functional Theory (DFT) calculations were used to understand the electronic properties and catalytic mechanism.
  • Electrochemical characterization techniques were applied to evaluate the OER performance and overall water splitting efficiency.

Main Results:

  • NiO/NiCo2O4/NF demonstrated enhanced OER activity due to interface-triggered charge transfer and superior metallic characteristics.
  • The catalyst achieved a current density of 50 mA cm-2 at an overpotential of 336 mV with a Tafel slope of 93.2 mV dec-1.
  • A preliminary overall water splitting system using NiO/NiCo2O4/NF as the anode exhibited a lower operating voltage (1.670 V at 20 mA cm-2) compared to a Pt net||IrO2 couple.

Conclusions:

  • The NiO/NiCo2O4/NF heterojunction is a highly efficient electrocatalyst for the oxygen evolution reaction and overall water splitting.
  • The study highlights an effective strategy for creating multicomponent catalysts with rich interfaces for advanced electrochemical applications.