Electrocatalytic Oxidation of Hydroxide Ions by Co₃O₄ and Co₃O₄@SiO₂ Nanoparticles Both at Particle Ensembles and at the Single Particle Level.

Xie, Ruo‐Chen; Volokhova, Maria; Boldin, Aleksei; Seinberg, Liis; Tsujimoto, Masahiko; Yang, Minjun; Rasche, Bertold; Compton, Richard G.

We report that the Co3O4 nanoparticle‐mediated electrochemical oxidation under alkaline conditions of the hydroxide ion on a glassy carbon macroelectrode leads to hydrogen peroxide as the initial oxidation product of electron transfer. The latter is inferred to subsequently partially decompose to dioxygen by catalytic chemical reaction at the nanoparticles. At the single particle level, electrochemical particle‐electrode impacts point out the rate‐determining step and the limiting kinetics of the reaction. Furthermore, particles with a core‐shell structure of a Co3O4 core and SiO2 shell are synthesised, and their electrochemical behaviour is studied and compared with bare Co3O4 nanoparticles, suggesting the very likely broken or highly porous state of the silica shell, which is not otherwise easily distinguished, for example, by electron microscopy.

NANOPARTICLES; HYDROXIDES; POROUS silica; OXIDATION; CHEMICAL reactions

ChemElectroChem, 2020, Vol 7, Issue 5, p1261

2196-0216

Academic Journal

10.1002/celc.202000230