Electrochemically Identified Ultrathin Water-Oxidation Catalyst in Neutral pH Solution Containing Ni²⁺ and Its Combination with Photoelectrode.

ABSTRACT: Water oxidation electrocatalyzed by Ni²⁺ under neutral conditions was investigated using various electrochemical analyses. The addition of Ni²⁺ in a phosphate-buffered solution catalyzed the oxidation of water, as confirmed by the detection of oxygen generation via scanning electrochemical microscopy. A combination of cyclic voltammetry, coulometric titration, and electrochemical quartz microbalance measurements identified the catalysis as heterogeneous and the catalyst as a Ni-based ultrathin (<4 nm) layer ("Ni-Pi"). Analysis of the potential- and pH-dependency of the titrated amount of charge revealed that the catalyst was deposited only under anodic polarization conditions and was removed under unpolarized conditions; the catalyst may be Ni(III) oxide, and its form

SUBMITTER: Cho SK 

PROVIDER: S-EPMC6641076 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature