In:
Advanced Energy Materials, Wiley, Vol. 13, No. 35 ( 2023-09)
Abstract:
The simultaneous optimization of sluggish reaction kinetics and mass transfer in bifunctional oxygen electrocatalysts for air cathodes remains a great challenge. This study utilizes CoAl‐layered double hydroxide as a metal precursor to fabricate a bifunctional oxygen electrocatalyst, denoted as CoAl OXD ‐Thin. This electrocatalyst features a specific core–shell structure of Co species, which grows on an aerophilic and conductive substrate composed of Al 2 O 3 and carbon. It is successfully demonstrated that the thickness of Co@Co 3 O 4 core–shell structure can be easily controlled by selecting different precursors and the combination of Co core and Co 3 O 4 shell optimizes the adsorption strength of intermediates, leading to enhanced catalytic performance. Additionally, the Al species plays a dual role. It not only facilitates the mass transfer of oxygen species but also hinders the 2e − pathway of oxygen reduction reaction, leading to improved selectivity. Notably, the Zn–air batteries utilizing CoAl OXD ‐Thin demonstrate an impressive peak power density of 216.2 mW cm −2 , a high specific capacity of 800.8 mAh g Zn −1 , and excellent cycling stability and reversibility, surpassing those of the Pt/C + RuO 2 catalyst. This study presents a novel approach to enhance air cathode performance by optimizing reaction kinetics and mass transfer through precursor design.
Type of Medium:
Online Resource
ISSN:
1614-6832
,
1614-6840
DOI:
10.1002/aenm.202301580
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2555492-X
detail.hit.zdb_id:
2594556-7
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