期刊
JOURNAL OF POWER SOURCES
卷 482, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228903
关键词
Vanadium redox flow battery; Bipolar plate; Carbon nanofiber; Surface modification
Surface treatment with cactus-like carbon nanofibers significantly enhances the conductivity of composite bipolar plates, making them promising candidates for vanadium redox flow batteries with excellent durability and high energy efficiency.
To sufficiently improve the electrical conductivity of composite bipolar plates is crucial for their application in fuel cells and redox flow batteries. Eliminating the resin-rich layer on the surface of composite bipolar plates turns to be an effective approach. In this work, graphite/resin composite bipolar plates with advanced performance and durability are obtained after surface treatment with cactus-like carbon nanofibers which grow from the catalyst cores and stretch out to form cactus-like structures. Morphology and structure of the carbon nanofibers, as well as the morphology, electrical conductivity, electrochemical properties and charge-discharge performance of the bipolar plates in a vanadium redox flow battery (VRFB) are investigated. Results show that surface treatment with graphitized cactus-like carbon nanofibers significantly enhance the conductivity of the composite plates which reaches as high as 198.7 S cm(-1), and the area specific resistance can be reduced to 25.4 m Omega cm(2). The VRFB single cell with the modified bipolar plate exhibits very high energy efficiency of 86.28%, at 100 mA cm(-2), and shows excellent durability in charge-discharge cycling test. With the superior properties above, composite bipolar plates after surface treatment with cactus-like carbon nanofibers are promising candidates for VRFBs.
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