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Article Dans Une Revue Angewandte Chemie International Edition Année : 2020

Anodic Oxidation Enabled Cation Leaching for Promoting Surface Reconstruction in Water Oxidation

Yan Duan
  • Fonction : Auteur
Jun Yan Lee
  • Fonction : Auteur
Shibo Xi
  • Fonction : Auteur
Yuanmiao Sun
  • Fonction : Auteur
Jingjie Ge
  • Fonction : Auteur
Samuel Jun Hoong Ong
  • Fonction : Auteur
Yubo Chen
  • Fonction : Auteur
Shuo Dou
  • Fonction : Auteur
Fanxu Meng
  • Fonction : Auteur
Caozheng Diao
  • Fonction : Auteur
Adrian Fisher
  • Fonction : Auteur
Xin Wang
  • Fonction : Auteur
Günther Scherer
  • Fonction : Auteur
Zhichuan Xu

Résumé

Abstract A rational design for oxygen evolution reaction (OER) catalysts is pivotal to the overall efficiency of water electrolysis. Much work has been devoted to understanding cation leaching and surface reconstruction of very active electrocatalysts, but little on intentionally promoting the surface in a controlled fashion. We now report controllable anodic leaching of Cr in CoCr 2 O 4 by activating the pristine material at high potential, which enables the transformation of inactive spinel CoCr 2 O 4 into a highly active catalyst. The depletion of Cr and consumption of lattice oxygen facilitate surface defects and oxygen vacancies, exposing Co species to reconstruct into active Co oxyhydroxides differ from CoOOH. A novel mechanism with the evolution of tetrahedrally coordinated surface cation into octahedral configuration via non‐concerted proton‐electron transfer is proposed. This work shows the importance of controlled anodic potential in modifying the surface chemistry of electrocatalysts.

Domaines

Matériaux

Dates et versions

hal-04105982 , version 1 (25-05-2023)

Identifiants

Citer

Yan Duan, Jun Yan Lee, Shibo Xi, Yuanmiao Sun, Jingjie Ge, et al.. Anodic Oxidation Enabled Cation Leaching for Promoting Surface Reconstruction in Water Oxidation. Angewandte Chemie International Edition, 2020, 60 (13), pp.7418-7425. ⟨10.1002/anie.202015060⟩. ⟨hal-04105982⟩
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