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High-Valence Oxides for High Performance Oxygen Evolution Electrocatalysis.

Hao Wang1,2, Tingting Zhai3, Yifan Wu1

  • 1Department of Chemistry, The University of Hong Kong, Hong Kong SAR, 000000, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 30, 2023
PubMed
Summary
This summary is machine-generated.

High-valence oxides (HVOs) boost catalyst performance for the oxygen evolution reaction (OER) by optimizing electronic structure and enabling lattice oxygen-mediated pathways. Synthesis strategies are crucial for overcoming challenges in preparing these advanced electrocatalysts for energy applications.

Keywords:
electrocatalysishigh-valence oxidesoxygen evolution reactionvalence tuning

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is critical for solar/electric water splitting and metal-air batteries.
  • Transition metal oxides are key catalysts, with valence tuning offering performance enhancements.
  • High-valence oxides (HVOs) demonstrate superior OER activity due to unique electronic properties and reaction mechanisms.

Purpose of the Study:

  • To explore the mechanisms behind the enhanced OER performance of high-valence oxides (HVOs).
  • To discuss synthesis strategies for overcoming preparation challenges of HVOs.
  • To outline future perspectives for HVO electrocatalysts in energy conversion and storage.

Main Methods:

  • Analysis of charge transfer dynamics and intermediate evolution in HVOs.
  • Investigation of the adsorbate evolution mechanism (AEM) and lattice oxygen-mediated mechanism (LOM).
  • Review of synthesis approaches for HVOs, considering thermodynamic barriers.

Main Results:

  • High-valence states optimize eg-orbital filling, enhancing charge transfer between metal d and oxygen p bands.
  • Elevated O 2p bands in HVOs facilitate the lattice oxygen-mediated mechanism (LOM), overcoming AEM limitations.
  • Oxygen vacancies in HVOs promote direct oxygen coupling via LOM.

Conclusions:

  • HVOs offer a promising route to high-performance OER catalysts by enabling efficient LOM pathways.
  • Overcoming synthesis barriers is essential for the broader application of HVOs.
  • Further research into HVOs holds significant potential for advancing energy conversion and storage technologies.