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Co-Based Nanosheets with Transitional Metal Doping for Oxygen Evolution Reaction.

Chunhua Xiong1, Chao Cai2

  • 1College of Air Traffic Management, Civil Aviation Flight University of China, Guanghan 618307, China.

Nanomaterials (Basel, Switzerland)
|June 10, 2022
PubMed
Summary

Researchers synthesized ultrathin amorphous nanosheets (ANSs) of cobalt-based materials. These novel catalysts exhibit enhanced oxygen evolution reaction (OER) activity due to their disordered structure, offering improved performance for energy applications.

Keywords:
amorphous materialselectrocatalystslow bonded oxygentransition metal-based materialstwo-dimension nanosheets

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Two-dimensional (2D) materials are key high-performance catalysts.
  • Disrupting the ordered structure of 2D materials can increase active sites and catalytic activity.

Purpose of the Study:

  • To develop a method for synthesizing ultrathin amorphous nanosheets (ANSs) of various cobalt-based transition metal oxides (MCoOₓ, where M = V, Mn, Fe, Ni, Cu, Zn).
  • To investigate the electrocatalytic activity of these ANSs for the oxygen evolution reaction (OER) in alkaline media.

Main Methods:

  • Synthesis of ultrathin MCoOₓ amorphous nanosheets (ANSs) using a novel method.
  • Electrochemical characterization of ANSs, focusing on oxygen evolution reaction (OER) performance in alkaline solution.

Main Results:

  • The synthesized Co-based ANSs demonstrated high OER activity.
  • The enhanced activity is attributed to the broken long-range order and abundant low-bonded oxygen on the basal plane.
  • Stable Fe₁Co₁Oₓ ANSs achieved an overpotential of approximately 240 mV for 10 mA/cm² current density, outperforming many reported transition metal electrocatalysts.

Conclusions:

  • Ultrathin amorphous nanosheets of cobalt-based materials are effective electrocatalysts for OER.
  • Disrupting the long-range order in 2D materials is a viable strategy to boost catalytic activity.
  • These findings present promising new materials for efficient energy conversion technologies.