Composite Ni/NiO-Cr₂O₃ Catalyst for Alkaline Hydrogen Evolution Reaction.

ABSTRACT: We report a Ni-Cr/C electrocatalyst with unprecedented mass-activity for the hydrogen evolution reaction (HER) in alkaline electrolyte. The HER kinetics of numerous binary and ternary Ni-alloys and composite Ni/metal-oxide/C samples were evaluated in aqueous 0.1 M KOH electrolyte. The highest HER mass-activity was observed for Ni-Cr materials which exhibit metallic Ni as well as NiO _x and Cr₂O₃ phases as determined by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analysis. The onset of the HER is significantly improved compared to numerous binary and ternary Ni-alloys, including Ni-Mo materials. It is likely that at adjacent Ni/NiO _x sites, the oxide acts as a sink for OH_ads, while the metallic Ni acts a

SUBMITTER: Bates MK 

PROVIDER: S-EPMC4501498 | biostudies-literature | 2015 Mar

REPOSITORIES: biostudies-literature