期刊
ELECTROCHIMICA ACTA
卷 281, 期 -, 页码 601-610出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.06.011
关键词
Energy storage; Vanadium redox flow battery; Electrode; Electrospinning technique; Electrochemical kinetics
资金
- National Natural Science Foundation of China [51504079]
- Hebei Natural Science Fund for Distinguished Young Scholar [E2017209079]
- Open Project Program of State Key Laboratory Breeding Base of Nuclear Resources and Environment [NRE1503]
- Natural Science Foundation of Hebei Province [B2016209321]
- Tangshan Scientific and Technical Innovation Team Project of China [15130201C]
In this paper, flexible carbon nanofiber embedded with TiO2 (CNF/TiO2) was prepared by electrospinning technique, and used as negative electrode for vanadium redox flow battery (VRFB). CNF/TiO2 composites were synthesized from solution consisting of Ti(OC4H9)(4) as TiO2 precursor and polyacrilonitrile (PAN) as carbon precursor. High-purity rutile TiO2 can be dispersed evenly in CNF with the diameter of 100 -200 nm. CNF/TiO2 composites exhibited superior electrochemical activity towards V2+/V3+ redox reaction compared with pristine CNF. The excellent energy storage performances of VRFB were achieved via using CNF/TiO2 as negative electrode, with larger capacity and efficiency. At a current density of 90 mA cm(-2), the discharge capacity of the cell using CNF/TiO2 electrode reached 84.0 mA h, 48.5 mA h higher than that of pristine cell. The energy efficiency of the cell based on CNF/TiO2 increased by 8.7% compared with pristine cell. The excellent electrochemical performance of CNF/TiO2 composite towards V2+/V3+ redox reaction was attributed to the synergistic effect between carbon nanofiber networks with high conductivity and rutile TiO2 with high electrocatalytic properties. (c) 2018 Elsevier Ltd. All rights reserved.
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