Graphene-Nanowall-Decorated Carbon Felt with Excellent Electrochemical Activity Toward VO(2)(+)/VO(2+) Couple for All Vanadium Redox Flow Battery.
Graphene-Nanowall-Decorated Carbon Felt with Excellent Electrochemical Activity Toward VO(2)(+)/VO(2+) Couple for All Vanadium Redox Flow Battery.
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DOI：
10.1002/advs.201500276
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发表时间：
2016-04
期刊：
影响因子：
15.1
通讯作者：
Lee, Chun-Sing
中科院分区：
文献类型：
--
作者：
Li, Wenyue;Zhang, Zhenyu;Tang, Yongbing;Bian, Haidong;Ng, Tsz-Wai;Zhang, Wenjun;Lee, Chun-Sing
采用原位微波等离子体增强化学气相沉积法制备了三维石墨烯修饰碳毡（CF），并将其用作钒液流电池（VRFB）的正极材料。碳纤维中的碳纤维被垂直生长的石墨烯球成功地包裹，这不仅增加了电极的比表面积，而且还暴露出高密度的尖锐石墨烯边缘，对钒离子具有良好的催化活性。结果表明，与未改性CF电极相比，具有这种新型电极的VRFB对VO 2 +/VO 2+氧化还原电对的反应速率高出3倍，能量效率提高了11%。此外，这种设计的架构在电池操作中显示出优异的稳定性。在100次充放电循环后，电极不仅没有表现出可观察到的形态变化，而且还可以在另一电池中重复使用，并且具有相同的性能。这一新的结构和合成方法将为VRFB电极的发展提供新的方向。
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.
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