Electrochemical investigation of thermically treated graphene oxides as electrode materials for vanadium redox flow battery
Electrochemical investigation of thermically treated graphene oxides as electrode materials for vanadium redox flow battery
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DOI：
10.1016/j.apenergy.2015.02.073
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发表时间：
2015-06-01
期刊：
影响因子：
11.2
通讯作者：
Di Blasi, A.
中科院分区：
文献类型：
--
作者：
Di Blasi, O.;Briguglio, N.;Di Blasi, A.
在还原环境（20%H-2/He）中在100 ° C、150 ° C、200 ° C和300 ° C的不同温度下合成经热处理的石墨烯氧化物（TT-SiO2），并研究其作为钒氧化还原液流电池（VRFB）应用的电极材料。通过湿浸渍法使用碳毡（CF）作为载体制备经处理的氧化石墨烯基电极。主要目的是实现分散的氧化石墨烯在CF表面上的合适分布，以便从可行的大面积电极放大的角度研究VO 2 +/VO 2+和V2+/V3+氧化还原反应的电催化活性，用于实际感兴趣的电池配置。在三电极半电池中进行循环伏安法（CV）和电化学阻抗谱（EIS）以表征基于TT-GO的电极的电化学性质。进行物理化学表征，以证实电化学结果。在100 ℃下处理的TT-GO样品（TT-GO-100）在峰间分离（Δ E = 0.03 V）和电流密度强度（在30 mV/s下类似于0.24 A cm（-2））方面均显示出对VO 2 +/VO 2+和V2+/V3+氧化还原反应的最高电催化活性。该结果与作为活性位点的羟基（-OH）和羧基（-COOH）物质的存在相关。从电极放大的角度来看，有效的候选者被个性化为有效的阳极和阴极电极，用于实际感兴趣的电池配置。(C)2015爱思唯尔有限公司版权所有。
Thermically treated graphene oxides (TT-GOs) are synthesized at different temperatures, 100 degrees C, 150 degrees C, 200 degrees C and 300 degrees C in a reducing environment (20% H-2/He) and investigated as electrode materials for vanadium redox flow battery (VRFB) applications. The treated graphene oxide-based electrodes are prepared by the wet impregnation method using carbon felt (CF) as support. The main aim is to achieve a suitable distribution of the dispersed graphene oxides on the CF surface in order to investigate the electrocatalytic activity for the VO2+/VO2+ and V2+/V3+ redox reactions in the perspective of a feasible large area electrodes scale-up for battery configuration of practical interest. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are carried out in a three electrode half-cell to characterize the electrochemical properties of the TT-GO-based electrodes. Physico-chemical characterizations are carried out to corroborate the electrochemical results. The TT-GO sample treated at 100 degrees C (TT-GO-100) shows the highest electrocatalytic activity in terms of peak to peak separation (Delta E = 0.03 V) and current density intensity (similar to 0.24 A cm(-2) at 30 mV/s) both toward the VO2+/VO2+ and V2+/V3+ redox reactions. This result is correlated to the presence of hydroxyl (-OH) and carboxyl (-COOH) species that act as active sites. A valid candidate is individuated as effective anode and cathode electrode in the perspective of electrodes scale-up for battery configuration of practical interest. (C) 2015 Elsevier Ltd. All rights reserved.