Spatially and Chemically Resolved Visualization of Fe Incorporation into NiO Octahedra during the Oxygen Evolution Reaction.

ABSTRACT: The activity of Ni (hydr)oxides for the electrochemical evolution of oxygen (OER), a key component of the overall water splitting reaction, is known to be greatly enhanced by the incorporation of Fe. However, a complete understanding of the role of cationic Fe species and the nature of the catalyst surface under reaction conditions remains unclear. Here, using a combination of electrochemical cell and conventional transmission electron microscopy, we show how the surface of NiO electrocatalysts, with initially well-defined surface facets, restructures under applied potential and forms an active NiFe layered double (oxy)hydroxide (NiFe-LDH) when Fe³⁺ ions are present in the electrolyte. Continued OER under these conditions, however, leads to the creation of additional FeO

SUBMITTER: Yang F 

PROVIDER: S-EPMC10557136 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature