An exsolution constructed FeNi/NiFe₂O₄ composite: preferential breaking of octahedral metal-oxygen bonds in a spinel oxide.

ABSTRACT: Exsolution is an ingenious strategy for the in situ construction of metal- or alloy-decorated oxides and, due to its promising energy related catalysis applications, has advanced from use in perovskites to use in spinels. Despite its great importance for designing target composites, the ability to identify whether active metal ions at octahedral or tetrahedral sites will preferentially exsolve in a spinel remains unexplored. Here, an inverse spinel NiFe₂O₄ (NFO) was employed as a prototype and FeNi/NFO composites were successfully constructed via exsolution. The preferential breaking of octahedral metal-oxygen bonds in the spinel oxide was directly observed using Mössbauer and X-ray absorption spectroscopy. This was further verified from the negative seg

SUBMITTER: Guo X 

PROVIDER: S-EPMC9384820 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature