Highly Active and Renewable Catalytic Electrodes for Two-Electron Oxygen Reduction Reaction.

Autor: Naya SI; Environmental Research Laboratory, Kindai University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan., Suzuki H; Graduate School of Science and Engineering, Kindai University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan., Kobayashi H; Emeritus Prof. Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan., Tada H; Graduate School of Science and Engineering, Kindai University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
Jazyk: angličtina
Zdroj: Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2022 Apr 19; Vol. 38 (15), pp. 4785-4792. Date of Electronic Publication: 2022 Apr 06.
DOI: 10.1021/acs.langmuir.2c00659
Abstrakt: This study has shown that antimony-doped tin oxide (ATO) works as a robust "renewable catalyst" for the electrochemical synthesis of hydrogen peroxide (H 2 O 2 ) from water and oxygen. Antimony doping into SnO 2 gives rise to remarkable electrocatalytic activity for two-electron oxygen reduction reaction (2e - -ORR) by water with a volcano-type relation between the activity and doping levels ( x Sb ). Density functional theory simulations highlight the importance of an isolated Sb atom of ATO inducing the high activity and selectivity for 2e - -ORR due to the effects of O 2 adsorption enhancement, decrease in the activation energy, and lowering the adsorptivity of H 2 O 2 . Electrolysis by a normal three-electrode cell using ATO ( x Sb = 10.2 mol %) at -0.22 V (vs reversible hydrogen electrode) stably and continuously produces H 2 O 2 with a turnover frequency of 6.6 s -1 . This remarkable activity can be maintained even after removing the surface layer of ATO by argon-ion sputtering.
Databáze: MEDLINE
Externí odkaz: