The jahn-Teller effect for amorphization of molybdenum trioxide towards high-performance fiber supercapacitor

Chenyang Yu, Hai Xu, Yujiao Gong, Ruyi Chen, Zengyu Hui, Xi Zhao, Yue Sun, Qiang Chen, Jinyuan Zhou, Wenxin Ji, Gengzhi Sun, Wei Huang

科研成果: 期刊稿件文章同行评审

30 引用 (Scopus)

摘要

Amorphous pseudocapacitive nanomaterials are highly desired in energy storage applications for their disordered crystal structures, fast electrochemical dynamics, and outstanding cyclic stability, yet hardly achievable using the state-of-The-Art synthetic strategies. Herein, for the first time, high capacitive fiber electrodes embedded with nanosized amorphous molybdenum trioxide (A-MoO3-x) featuring an average particle diameter of ~20nm and rich oxygen vacancies are obtained via a top-down method using -MoO3 bulk belts as the precursors. The Jahn-Teller distortion in MoO6 octahedra due to the doubly degenerate ground state of Mo5+, which can be continuously strengthened by oxygen vacancies, triggers the phase transformation of -MoO3 bulk belts (up to 30 m long and 500 nm wide). The optimized fibrous electrode exhibits among the highest volumetric performance with a specific capacitance (CV) of 921.5 F cm-3 under 0.3Acm-3, endowing the fiber-based weaveable supercapacitor superior CV and EV (energy density) of 107.0 F cm-3 and 9.5mWhcm-3, respectively, together with excellent cyclic stability, mechanical robustness, and rate capability. This work demonstrates a promising strategy for synthesizing nanosized amorphous materials in a scalable, cost-effective, and controllable manner.

源语言英语
文章编号6742715
期刊Research
2021
DOI
出版状态已出版 - 3月 2021

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