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Atomic cobalt catalysts for the oxygen evolution reaction.

Qiaoqiao Zhang1, Zhiyao Duan2, Min Li1

  • 1Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Changchun 130021, P. R. China. guanjq@jlu.edu.cn.

Chemical Communications (Cambridge, England)
|December 19, 2019
PubMed
Summary
This summary is machine-generated.

We developed a novel cobalt- and nitrogen-codoped graphene catalyst using an annealing strategy for efficient oxygen evolution reactions (OER). This single-atom catalyst (SAC) demonstrates excellent performance in alkaline solutions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing high-efficiency single-atom catalysts (SACs) for the oxygen evolution reaction (OER) remains a significant challenge in catalysis.
  • The OER is a critical process in water splitting for hydrogen production and other energy conversion technologies.

Purpose of the Study:

  • To report a facile annealing strategy for constructing an atomically dispersed cobalt- and nitrogen-codoped graphene catalyst.
  • To evaluate the electrocatalytic performance of the synthesized catalyst for the OER.

Main Methods:

  • A facile annealing strategy was employed to synthesize the catalyst.
  • Electrochemical measurements were conducted using a glassy carbon electrode in 1.0 M KOH and 0.1 M KOH solutions.
  • Density functional theory (DFT) calculations were performed to investigate the active sites.

Main Results:

  • The synthesized 0.7-Co@NG-750 electrocatalyst exhibited an ultra-low onset overpotential of approximately 210 mV for OER.
  • DFT calculations identified Co-N4 and Co-N2C2 sites as potential efficient active sites with theoretical overpotentials of 0.41 V and 0.53 V, respectively.

Conclusions:

  • The facile annealing strategy is effective for developing high-efficiency single-atom catalysts for OER.
  • The cobalt- and nitrogen-codoped graphene catalyst shows promising activity for electrocatalytic water oxidation.