Defective blue titanium oxide induces high valence of NiFe-(oxy)hydroxides over heterogeneous interfaces towards high OER catalytic activity.

ABSTRACT: Nickel-iron (oxy)hydroxides (NiFeO_xH_y) have been validated to speed up sluggish kinetics of the oxygen evolution reaction (OER) but still lack satisfactory substrates to support them. Here, non-stoichiometric blue titanium oxide (B-TiO_x) was directly derived from Ti metal by alkaline anodization and used as a substrate for electrodeposition of amorphous NiFeO_xH_y (NiFe/B-TiO_x). The performed X-ray absorption spectroscopy (XAS) and density functional theory (DFT) calculations evidenced that there is a charge transfer between B-TiO_x and NiFeO_xH_y, which gives rise to an elevated valence at the Ni sites (average oxidation state ∼ 2.37)

SUBMITTER: Zhou T 

PROVIDER: S-EPMC10686043 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature