全钒液流电池石墨毡电极的Ga_2O_3修饰

Modification of graphite felt with Ga_2O_3 in vanadium redox flow battery

为提高全钒液流电池石墨毡电极的电化学性能,采用热分解法将纳米Ga2O3沉积在全钒液流电池石墨毡电极表面。通过循环伏安测试、动电位极化曲线测试、扫描电镜测试(SEM)、X射线光电子能谱分析(XPS)和充放电实验考察了Ga2O3对石墨毡电化学性能和表面形貌的影响。研究结果表明:Ga2O3对电极反应具有显著的催化作用,当用Ga2O3电极修饰石墨毡时,电池正负极反应活性较未处理前分别提高13%和18%,同时也导致全钒液流电池的容量更大,电流效率和能量效率更高。

To improve the electrochemical activities of graphite felt (GF) electrodes of all vanadium flow battery (VRB), nano-Ga2O3 were deposited on the surface of graphite felt (GF) electrode in an VRB using thermal decomposition. Electrochemical performance and morphology of GF were studied by cyclic voltammetry (CV), polarization curves, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and charge-discharge test. The results showed that Ga2O3 has catalytic effects towards redox reaction of the electrode, when modifying the GF with Ga2O3, the anodic and cathodic reactivity of the VRB were increased by 13% and 18% compared with pristine one, while the battery exhibited higher capacity, current efficiency and energy efficiency.