title: Graphene-Nanowall-Decorated Carbon Felt with Excellent Electrochemical Activity Toward VO2+/VO2+Couple for All Vanadium Redox Flow Battery.
abstract: 3D graphene-nanowall-decorated carbon felts (CF) are synthesized via an in situ microwave plasma enhanced chemical vapor deposition method and used as positive electrode for vanadium redox flow battery (VRFB). The carbon fibers in CF are successfully wrapped by vertically grown graphene nanowalls, which not only increase the electrode specific area, but also expose a high density of sharp graphene edges with good catalytic activities to the vanadium ions. As a result, the VRFB with this novel electrode shows three times higher reaction rate toward VO2+/VO2+redox couple and 11% increased energy efficiency over VRFB with an unmodified CF electrode. Moreover, this designed architecture shows excellent stability in the battery operation. After 100 charging-discharging cycles, the electrode not only shows no observable morphology change, it can also be reused in another battery and practical with the same performance. It is believed that this novel structure including the synthesis procedure will provide a new developing direction for the VRFB electrode.
authors: Functional Thin Films Research Centre Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China; Department of Physics and Materials Science Center of Super-Diamond and Advanced Films (COSDAF)The City University of Hong Kong Hong Kong SARP. R. China.
authors: Wenyue
authors: W
authors: Li
authors: Department of Physics and Materials Science Center of Super-Diamond and Advanced Films (COSDAF) The City University of Hong Kong Hong Kong SAR P. R. China.
authors: Zhenyu
authors: Z
authors: Zhang
authors: Functional Thin Films Research Centre Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China.
authors: Yongbing
authors: Y
authors: Tang
authors: Department of Physics and Materials Science Center of Super-Diamond and Advanced Films (COSDAF) The City University of Hong Kong Hong Kong SAR P. R. China.
authors: Haidong
authors: H
authors: Bian
authors: Department of Physics and Materials Science Center of Super-Diamond and Advanced Films (COSDAF) The City University of Hong Kong Hong Kong SAR P. R. China.
authors: Tsz-Wai
authors: TW
authors: Ng
authors: Department of Physics and Materials Science Center of Super-Diamond and Advanced Films (COSDAF) The City University of Hong Kong Hong Kong SAR P. R. China.
authors: Wenjun
authors: W
authors: Zhang
authors: Department of Physics and Materials Science Center of Super-Diamond and Advanced Films (COSDAF) The City University of Hong Kong Hong Kong SAR P. R. China.
authors: Chun-Sing
authors: CS
authors: Lee
keywords: 3D; electrochemical activity; energy storage; graphene nanowalls; vanadium redox flow battery