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Ordered porous Mn - Co spinel oxide (CoMn2O4) with vacancies modulation as efficient electrocatalyst for Li - O2 battery.
Dai, Linna; Zhou, Xin; Yang, Yuan; Hu, Pei; Ci, Lijie.
Afiliación
  • Dai L; School of Science, Hubei University of Technology, Nanli Road #28, Wuhan, Hubei Province 430068, China.
  • Zhou X; School of Science, Hubei University of Technology, Nanli Road #28, Wuhan, Hubei Province 430068, China.
  • Yang Y; School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China.
  • Hu P; School of Science, Hubei University of Technology, Nanli Road #28, Wuhan, Hubei Province 430068, China. Electronic address: hupei@hbut.edu.cn.
  • Ci L; Research Center for Carbon Nanomaterials, Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China. Electronic address: lci@sdu.edu.cn.
J Colloid Interface Sci ; 670: 719-728, 2024 Sep 15.
Article en En | MEDLINE | ID: mdl-38788439
ABSTRACT
Nonaqueous Li - O2 battery (LOB) is considered one of the most promising energy storage system due to its ultrahigh theoretical specific capacity (3500 Wh kg-1). Introducing vacancies in CoMn2O4 catalysts is regarded as an effective strategy to enhance the electrochemical performances of LOB. However, the relation between vacancy types in CoMn2O4 and catalytic performances in the LOB remains ambiguous. Herein, ordered porous CoMn2O4 with oxygen and metal vacancies is obtained via solvothermal reaction followed by temperature-controlled calcination using polystyrene spheres as templates. The increase in treatment temperature reduces the content of oxygen vacancies while increasing that of the metal vacancies. Notably, experimental results and theoretical calculations show that oxygen vacancies in CoMn2O4 have a greater influence than metal vacancies in modulating the LiO2 adsorption during the reaction processes and reducing the overpotential. CoMn2O4 synthesized at 500 ℃ (CoMnO-500) with higher oxygen vacancies exhibits stronger adsorption onto the LiO2, facilitating the formation of film-like Li2O2. Therefore, an LOB with the CoMnO-500 catalyst presents the lowest overpotential of 1.2 V and longest cycle lifespan of 286 cycles at a current density of 200 mA g-1. This study offers insights into the effect of CoMn2O4 vacancies on the formation pathway of Li2O2 discharge products.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos