期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 606, 期 -, 页码 77-86出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.001
关键词
Bimetallic oxides; Interface protection; Kinetics optimization; Battery; Capacitor
资金
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_2101]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Natural Science Foundation of Shandong Province, China [ZR2017MEM019]
In this study, ultrathin amorphous carbon shells and lattice defects are introduced to improve the electron/ion kinetic stability and electrochemical activity of bimetallic oxides. The ultrathin carbon interface protects unstable lattice with defects and enhances the stability and uniformity of ion transport.
Interface protection and kinetics optimization could effectively relieve the shortcomings of bimetallic oxides, such as low conductivity, strong hydrophobicity, insufficient ion diffusion rate and metal interatomic instability. In this work, ultrathin amorphous carbon shells and lattice defects (heteroatoms and vacancies) are introduced into the MnNb2O6 nanofiber surface to improve the electron/ion kinetic stability, conductivity and electrochemical activity. The ultrathin carbon interface protects unstable lattice with defects, thus restraining the adverse reaction between bimetallic oxides and electrolyte. Especially, ultrathin amorphous carbon layer enhances the stability and uniformity of ion transport as the substitute of solid-liquid ion exchange membrane. Lattice defects (N doping and oxygen vacancy) also enhance the ionic kinetics of the material. MnNb2O6 nanofiber, being optimized by interface protection and lattice defects, shows excellent electrochemical performances in Lithium-ion battery and supercapacitor. (C) 2021 Elsevier Inc. All rights reserved.
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