期刊
APPLIED SURFACE SCIENCE
卷 401, 期 -, 页码 106-113出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.01.002
关键词
Energy storage; Vanadium redox flow battery; Carbon nanotubes; Catalyst; KOH activation
类别
资金
- National Natural Science Foundation of China [51504079]
- Foundation of Education Department of Hebei Province [QN2016183, ZC2016035, Z2015140]
- Tangshan Scientific and Technical Innovation Team Project of China [15130201C]
- Open Project Program of State Key Laboratory Breeding Base of Nuclear Resources and Environment [NRE1503]
In this paper, carbon nanotubes (CNTs) was activated by KOH treatment at high temperature and investigated as catalyst for VO2+/VO2+ redox reaction for vanadium redox flow battery (VRFB). X-ray photoelectron spectroscopy results suggest that the oxygen-containing groups can be introduced on CNTs by KOH activation. The mass transfer of vanadium ions can be accelerated by chemical etching by KOH activation and improved wettability due to the introduction of hydrophilic groups. The electrochemical properties of VO2+/VO2+ redox reaction can be enhanced by introduced oxygen-containing groups as active sites. The sample treated at 900 degrees C with KOH/CNTs mass ratio of 3:1 (CNTs-3) exhibits the highest electrocatalytic activity for VO2+/VO2+ redox reaction. The cell using CNTs-3 as positive catalyst demonstrates the smallest electrochemical polarization, the highest capacity and efficiency among the samples. Using KOH-activated CNTs-3 can increase the average energy efficiency of the cell by 4.4%. This work suggests that KOH-activated CNTs is a low-cost, efficient and promising catalyst for VO2+/VO2+ redox reaction for VRFB system. (C) 2017 Elsevier B.V. All rights reserved.
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