全钒液流电池正极和负极材料的处理方法

Different treatments for positive and negative electrode materials of an all-vanadium redox flow battery

为了获得大反应电流,全钒氧化还原液流电池使用聚丙烯腈基碳毡为电极活性材料.在空气中热处理碳毡可以增加其表面含氧官能团浓度,改善碳毡的亲水性,降低反应过电位.实验表明:电池的过电位主要由正极反应造成;热处理正极碳毡可以大大降低电池极化内阻,负极碳毡热处理后降低了析氢过电位,从而降低了电池的电流效率;正极使用热处理后的碳毡,负极使用未经处理的原毡,可以获得更好的电池能量效率.

An all-vanadium redox-flow battery （VRB） typically uses carbon felt as the electrode material in order to enhance the reactive current. The carbon felt made by polyaerylonitrile-based polymers can be heat-treated to increase the number of surface oxide sites and to improve its crystallinity and conductivity. It was examined in VRB that the over potentiality was mainly caused by positive pole reactions. The heat treatment of positive felt could decrease the cell＇s resistance dramatically, but that of negative felt induced low hydrogen evolution over potentiality and low current efficiency. With raw felt as the negative pole material and heat-treated felt as the positive pole material the test cell could get the optimal energy efficiency.