材料科学
氧化还原
电化学
钒
电极
电解质
化学工程
润湿
流动电池
可逆氢电极
碳纳米管
标准氢电极
无机化学
纳米技术
工作电极
化学
复合材料
物理化学
工程类
冶金
作者
Kerstin Köble,Monja Schilling,László Eifert,Nico Bevilacqua,Kieran F. Fahy,Plamen Atanassov,Aimy Bazylak,Roswitha Zeis
标识
DOI:10.1021/acsami.3c07940
摘要
Carbon electrodes are one of the key components of vanadium redox flow batteries (VRFBs), and their wetting behavior, electrochemical performance, and tendency to side reactions are crucial for cell efficiency. Herein, we demonstrate three different types of electrode modifications: poly(o-toluidine) (POT), Vulcan XC 72R, and an iron-doped carbon-nitrogen base material (Fe-N-C + carbon nanotube (CNT)). By combining synchrotron X-ray imaging with traditional characterization approaches, we give thorough insights into changes caused by each modification in terms of the electrochemical performance in both half-cell reactions, wettability and permeability, and tendency toward the hydrogen evolution side reaction. The limiting performance of POT and Vulcan XC 72R could mainly be ascribed to hindered electrolyte transport through the electrode. Fe-N-C + CNT displayed promising potential in the positive half-cell with improved electrochemical performance and wetting behavior but catalyzed the hydrogen evolution side reaction in the negative half-cell.
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