钒
流动电池
循环伏安法
氧化还原
X射线光电子能谱
化学
介电谱
聚合物
溶解
电解质
傅里叶变换红外光谱
膜
化学工程
电极
分析化学(期刊)
电化学
材料科学
无机化学
有机化学
物理化学
工程类
生物化学
作者
Hyung‐Seok Lim,Sujong Chae,Litao Yan,Guosheng Li,Ruozhu Feng,Yongsoon Shin,Zimin Nie,Bhuvaneswari M. Sivakumar,Xin Zhang,Yangang Liang,David Bazak,V. Shutthanandan,Vijayakumar Murugesan,Soohwan Kim,Wei Wang
标识
DOI:10.34133/2022/9863679
摘要
Redox flow batteries are considered a promising technology for grid energy storage. However, capacity decay caused by crossover of active materials is a universal challenge for many flow battery systems, which are based on various chemistries. In this paper, using the vanadium redox flow battery as an example, we demonstrate a new gel polymer interface (GPI) consisting of crosslinked polyethyleneimine with a large amount of amino and carboxylic acid groups introduced between the positive electrode and the membrane. The GPI functions as a key component to prevent vanadium ions from crossing the membrane, thus supporting stable long-term cycling. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements were conducted to investigate the effect of GPI on the electrochemical properties of graphitic carbon electrodes (GCFs) and redox reaction of catholyte. X-ray photoelectron spectroscopy (XPS) and 1 H nuclear magnetic resonance (NMR) spectra demonstrated that the crosslinked GPI is chemically stable for 100 cycles without dissolution of polymers and swelling in the strong acidic electrolytes. Results from inductively coupled plasma mass spectrometry (ICP-MS), Fourier-transform infrared (FTIR) spectroscopy, and energy-dispersive X-ray (EDX) spectroscopy proved that the GPI is effective in maintaining the concentration of vanadium species in their respective half-cells, resulting in improved cycling stability because of it prevents active species from crossing the membrane and stabilizes the oxidation states of active species.
科研通智能强力驱动
Strongly Powered by AbleSci AI