Lattice oxygen activation enabled by high-valence metal sites for enhanced water oxidation.

ABSTRACT: Anodic oxygen evolution reaction (OER) is recognized as kinetic bottleneck in water electrolysis. Transition metal sites with high valence states can accelerate the reaction kinetics to offer highly intrinsic activity, but suffer from thermodynamic formation barrier. Here, we show subtle engineering of highly oxidized Ni⁴⁺ species in surface reconstructed (oxy)hydroxides on multicomponent FeCoCrNi alloy film through interatomically electronic interplay. Our spectroscopic investigations with theoretical studies uncover that Fe component enables the formation of Ni⁴⁺ species, which is energetically favored by the multistep evolution of Ni²⁺→Ni³⁺→Ni⁴⁺. The dynamically constructed Ni⁴⁺ species drives holes into oxygen ligands to

SUBMITTER: Zhang N 

PROVIDER: S-EPMC7426847 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature