Constructing High Efficiency CoZnxMn2–xO4 Electrocatalyst by Regulating the Electronic Structure and Surface Reconstruction. Issue 11 (17th January 2022)

• Record Type: Journal Article
• Authors: Zhao, Depeng; Zhang, Rui; Dai, Meizhen; Liu, Hengqi; Jian, Wei; Bai, Fu‐Quan; Wu, Xiang
• Is Part Of: Small. Volume 18:Issue 11(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-17
• Subjects: active species -- density functional theory -- doping engineering -- electrocatalysts -- oxygen vacancy -- surface reconstruction; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202107268
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: It is an effective strategy to develop novel electrocatalysts with controllable defects to enhance their electrocatalytic activity and stability. However, how to precisely design these catalysts on the atom scale remains very difficult. Herein, several vacancy‐dependent CoZnx Mn2–x O4 catalysts are prepared through tailoring the concentration of Zn ions. The in situ activation of the obtained products accelerates the surface reconstruction. The superior electrocatalytic performance can be ascribed to the formations of MOOH (Mn, Co) active species and abundant oxygen vacancies, which are comparable to noble IrO2 and Pt/C catalysts. Zn‐CoMn2 O4 ‐1.5 catalyst delivers a cell voltage of 1.63 V and long durability. Density functional theory calculations demonstrate that the appropriate Zn ion doping can improve the density states of p electron on the surface of catalysts significantly and benefit the d‐band center closing to Fermi level, suggesting their high charge carrier density and low adsorption energy. Abstract : In this work, several vacancy‐dependent CoZnx Mn2–x O4 catalysts are prepared by tailoring the concentration of Zn ions. The in situ activation can accelerate the surface reconstruction. The excellent electrocatalytic performance can be attributed to the formations of active species and abundant oxygen vacancies, which are comparable to noble IrO2 and Pt/C catalysts.