AI Article Synopsis

  • * High-valence oxides (HVOs) show enhanced OER performance by optimizing charge transfer dynamics and promoting effective mechanisms like adsorbate evolution and lattice oxygen mediation.
  • * Despite their advantages, synthesizing HVOs is challenging due to high thermodynamic barriers, and strategies for their development are outlined, alongside future challenges and opportunities in energy conversion and storage applications.

Article Abstract

Valence tuning of transition metal oxides is an effective approach to design high-performance catalysts, particularly for the oxygen evolution reaction (OER) that underpins solar/electric water splitting and metal-air batteries. Recently, high-valence oxides (HVOs) are reported to show superior OER performance, in association with the fundamental dynamics of charge transfer and the evolution of the intermediates. Particularly considered are the adsorbate evolution mechanism (AEM) and the lattice oxygen-mediated mechanism (LOM). High-valence states enhance the OER performance mainly by optimizing the e -orbital filling, promoting the charge transfer between the metal d band and oxygen p band. Moreover, HVOs usually show an elevated O 2p band, which triggers the lattice oxygen as the redox center and enacts the efficient LOM pathway to break the "scaling" limitation of AEM. In addition, oxygen vacancies, induced by the overall charge-neutrality, also promote the direct oxygen coupling in LOM. However, the synthesis of HVOs suffers from relatively large thermodynamic barrier, which makes their preparation difficult. Hence, the synthesis strategies of the HVOs are discussed to guide further design of the HVO electrocatalysts. Finally, further challenges and perspectives are outlined for potential applications in energy conversion and storage.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10401147PMC
http://dx.doi.org/10.1002/advs.202301706DOI Listing

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