Electrospun carbon nanofiber-supported V_(2)O_(3) with enriched oxygen vacancies as a free-standing high-rate anode for an all-vanadium-based full battery  

作　　者：Qi Lai Bincen Yin Yu Dou Qing Zhang Yunhai Zhu Yingkui Yang 

机构地区：[1]School of Chemistry and Materials Science,South-Central Minzu University,Wuhan,China [2]State Key Laboratory of New Textile Materials and Advanced Processing Technologies,Wuhan Textile University,Wuhan,China

出　　处：《Carbon Energy》2024年第9期15-28,共14页碳能源（英文）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant Nos.52173091,51973235);the Hubei Provincial Natural Science Foundation of China(Grant No.2021CFA022);Fundamental Research Funds for Central Universities(Grant No.CPT22023).

摘　　要：Synergistic regulation of hierarchical nanostructures and defect engineering is effective in accelerating electron and ion transport for metal oxide electrodes.Herein,carbon nanofiber-supported V_(2)O_(3) with enriched oxygen vacancies(OV-V_(2)O_(3)@CNF)was fabricated using the facile electrospinning method,followed by thermal reduction.Differing from the traditional particles embedded within carbon nanofibers or irregularly distributed between carbon nanofibers,the free-standing OV-V_(2)O_(3)@CNF allows for V_(2)O_(3) nanosheets to grow vertically on one-dimensional(1D)carbon nanofibers,enabling abundant active sites,shortened ion diffusion pathway,continuous electron transport,and robust structural stability.Meanwhile,density functional theory calculations confirmed that the oxygen vacancies can promote intrinsic electron conductivity and reduce ion diffusion energy barrier.Consequently,the OV-V_(2)O_(3)@CNF anode delivers a large reversible capacity of 812 mAh g^(-1) at 0.1 A g^(-1),superior rate capability(405 mAh g^(-1) at 5 A g^(-1)),and long cycle life(378 mAh g^(-1) at 5 A g^(-1) after 1000 cycles).Moreover,an all-vanadium full battery(V2O5//OV-V_(2)O_(3)@CNF)was assembled using an OV-V_(2)O_(3)@CNF anode and a V2O5 cathode,which outputs a working voltage of 2.5 V with high energy density and power density,suggesting promising practical application.This work offers fresh perspectives on constructing hierarchical 1D nanofiber electrodes by combining defect engineering and electrospinning technology.

关 键 词：electrospun electrode full battery oxygen vacancy vanadium trioxide 

分 类 号：TM91[电气工程—电力电子与电力传动]