Defect-Engineered Hydroxylated Mesoporous Spinel Oxides as Bifunctional Electrocatalysts for Oxygen Reduction and Evolution Reactions.

ABSTRACT: In this work, defect-rich ordered mesoporous spinel oxides, including CoCo₂O₄, NiCo₂O₄, and ZnCo₂O₄, were developed as bifunctional electrocatalysts toward oxygen reduction and evolution reactions (ORR and OER, respectively). The materials are synthesized via nanocasting and modified by chemical treatment with 0.1 M NaBH₄ solution to enhance the defect concentration. The synthesized samples have metal and oxygen divacancies (V_Co + V_O) as the primary defect sites, as indicated by positron annihilation lifetime spectroscopy (PALS). Cation substitution in the spinel structure induces a higher number of oxygen vacancies. The increased number of surface defects and the synergistic effect between t

SUBMITTER: Deeloed W 

PROVIDER: S-EPMC9136850 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature