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This review explores new strategies for developing cerium-based electrocatalysts for oxygen evolution (OER) and oxygen reduction (ORR) reactions. These low-cost materials show promise for replacing precious metals in catalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Cerium (Ce)-based materials are known for redox pairs and oxygen vacancies, useful in photocatalysis.
  • Research on cerium-based materials for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is limited.
  • Pristine cerium materials like CeO2 are often non-conductive, hindering their use as electrocatalysts.

Purpose of the Study:

  • To review recent strategies for developing advanced cerium-based electrocatalysts for OER and ORR.
  • To address the limitations of non-conductive and unstable cerium-based electrocatalysts.
  • To highlight the potential of low-cost cerium materials as alternatives to precious metals.

Main Methods:

  • Review of strategies including metal-organic framework (MOF) derivatives.
  • Analysis of structure tuning approaches for cerium-based materials.
  • Examination of polymetallic doping techniques to enhance electrocatalytic properties.

Main Results:

  • Identified three main categories of strategies: MOF derivatives, structure tuning, and polymetallic doping.
  • These strategies aim to improve conductivity and stability of cerium-based electrocatalysts.
  • Cerium's abundance and low cost make it a viable alternative to precious metal catalysts.

Conclusions:

  • Cerium-based materials offer a promising, cost-effective avenue for OER and ORR electrocatalysis.
  • Further research into novel strategies is crucial for overcoming current limitations.
  • These materials have significant potential to replace expensive precious and transition metals.