A three-dimensional conducting network of rGO-in-graphite-felt as electrode for vanadium redox flow batteries

Electrochemical Energy Technology Pub Date : 2018-12-01 DOI:10.1515/eetech-2018-0008

Hongrui Wang, Wei Ling, Jizhong Chen, Zhian Wang, Xian‐Xiang Zeng, Yongqing Hu, Xiongwei Wu, Qi Deng, Guanghui Chen, Yuping Wu, R. Holze

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引用次数: 3

Abstract

Abstract Graphite felt (GF) with numerous merits has been widely used as electrode in all-vanadium redox flow batteries (VRFB), but its further application is still hindered by its intrinsically poor electrocatalytic activity. Herein, we propose a three-dimensional (3D) conducting network constructed with reduced graphene oxide (rGO) in the GF electrode via a two-step method. The 3D conducting network with abundant oxygen-containing functional groups in the GF is conducive to the transport of electrons between GF fibers and the electrochemical charge transfer to vanadium ions in the composite electrode; it can enhance the electrocatalytic activity and conductivity of GF. The VRFB using 3D rGO modified GF (mGF) electrode exhibited outstanding energy efficiency of 73.4% at a current density of 100 mA·cm−2, which is much higher than that with pristine GF (pGF) (65.4%); and better rate capability. These first results reveal that GF with 3D conducting network shows promising opportunities for the VRFB and other electrochemical flow systems

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石墨毡中氧化石墨烯三维导电网络作为钒氧化还原液流电池的电极

石墨毡(GF)具有许多优点，被广泛用于全钒氧化还原液流电池(VRFB)的电极，但其固有的电催化活性较差，阻碍了其进一步的应用。在此，我们提出了一个三维(3D)导电网络，通过两步法在GF电极中还原氧化石墨烯(rGO)构建。GF中含有丰富含氧官能团的三维导电网络有利于GF纤维之间的电子传递和电化学电荷向复合电极中的钒离子转移;它能提高GF的电催化活性和电导率。在100 mA·cm−2的电流密度下，采用3D rGO修饰的GF (mGF)电极制备的VRFB的能量效率为73.4%，远高于原始GF (pGF)的65.4%;以及更好的速率能力。这些初步结果表明，具有3D导电网络的GF在VRFB和其他电化学流动系统中具有广阔的应用前景

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Electrochemical Energy Technology

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