Lattice Oxygen Activation in NiFe (Oxy)hydroxide using Se

Seunghwan Jo, Jung Inn Sohn

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The lattice oxygen mechanism (LOM) is considered one of the promising approaches to overcome the sluggish oxygen evolution reaction (OER), bypassing -OOH* coordination with a high energetic barrier. Activated lattice oxygen can participate in the OER as a reactant and enables O*-O* coupling for direct O2 formation. However, such reaction kinetics inevitably include the generation of oxygen vacancies, which leads to structural degradation, and eventually shortens the lifetime of catalysts. Here, we demonstrate that Se incorporation significantly enhances OER performance and the stability of NiFe (oxy)hydroxide (NiFe) which follows the LOM pathway. In Se introduced NiFe (NiFeSe), Se forms not only metal-Se bonding but also Se-oxygen bonding by replacing oxygen sites and metal sites, respectively. As a result, transition metals show reduced valence states while oxygen shows less reduced valence states (O-/O22-) which is a clear evidence of lattice oxygen activation.

Original languageEnglish
Pages (from-to)339-344
Number of pages6
JournalKorean Journal of Materials Research
Volume32
Issue number8
DOIs
StatePublished - 2022

Keywords

  • Chalcogen
  • Electrocatalysts
  • Lattice oxygen mechanism
  • Oxygen evolution reaction
  • Transition metal (oxy)hydroxide

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