Influence of Fenton's reagent treatment on electrochemical properties of graphite felt for all vanadium redox flow battery
Influence of Fenton's reagent treatment on electrochemical properties of graphite felt for all vanadium redox flow battery
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DOI：
10.1016/j.electacta.2012.10.021
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发表时间：
2013-01-15
影响因子：
6.6
通讯作者：
Zi, HuiFang
中科院分区：
文献类型：
--
作者：
Gao, Chao;Wang, NanFang;Zi, HuiFang
采用Fenton试剂对碳纤维进行羟基化功能化处理，提高了石墨毡作为全钒氧化还原液流电池（VRFB）正极的电化学活性。研究了Fenton试剂中H2O2含量对GF结构和电化学性能的影响。扫描电镜（SEM）结果表明，随着H2O2含量的增加，处理后的GF表面蚀刻现象越来越明显。傅里叶变换红外光谱（FIR）表明，随着H2O2浓度的增加，处理毡上羟基的峰值强度增加，x射线光电子能谱（XPS）进一步证实了这一点。循环伏安（CV）和电化学阻抗谱（EIS）表明，处理后的样品具有较高的电化学活性。在60 mA cm（-2）下，以GF为电极的VRFB的库仑效率、电压效率和能量效率分别为98.8%、75.1%和74.2%，高于未处理GF的93.9%、72.1%和67.7%，且优于已有报道的方法。(C) 2012 Elsevier Ltd.版权所有。
An environmental, economic and highly effective method for carbon fiber hydroxylated-functionalization based on Fenton's reagent treatment is used to improve the electrochemical activity of graphite felt (GF) as the positive electrode in all vanadium redox flow battery (VRFB). The effect of H2O2 content in Fenton's reagent on the structure and electrochemical properties of GF is investigated. The scanning electron microscope (SEM) indicates that the surface of the treated GF is etched increasingly with the content of H2O2. The Fourier transformation infrared (FIR) spectroscopy shows that the peak intensity of hydroxyl groups on the treated felt is increased with the H2O2 concentration, which is further verified by X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show that the treated sample exhibits a higher electrochemical activity. A VRFB with the treated GF as electrodes exhibits higher coulombic, voltage and energy efficiency (98.8%, 75.1% and 74.2%) than that with the untreated GF (93.9%, 72.1% and 67.7%) at 60 mA cm(-2), and this method is even superior when compared with the reported methods. (C) 2012 Elsevier Ltd. All rights reserved.