Effect of cyclic electrodeposition on performances of Lead Flow Battery

The lead-acid battery is the most global energy storage device and its extensive list of applications includes electrical power supply for automobiles, communications, and railways. But this type of battery conventionally has a low specific capacity because of its heavy weight [1-2]. Unlike the conventional lead-acid battery lead flow battery has high specific capacity and the simplicity in its design, leading to quite inexpensive architectures [3].Here in we report an electrochemical deposition method of lead dioxide for application in lead flow batteries. Lead dioxide was deposited by cyclic voltammetry (CV) method in 10% methane sulfonic acid solution with different cycles on the graphite substrate. The morphology and crystal structure of electrodeposited PbO2 samples have been characterized using by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. The pore structures of the prepared samples were tested by N2 adsorption-desorption measurements. Study of the electrochemical characteristics of the samples was done by CV, galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS).The XRD patterns revealed that highly crystalline PbO2 particles were obtained, also the samples were found to be -PbO2. The SEM images showed that the uniform nanostructure of PbO2 was composed. The results of cells galvanostatic discharge shown that the capacity density of lead flow batteries were 207.89 mAh/g. While cell efficiency of the samples was changed from 98 to 96%.

کلیدواژه ها:

lead acid redox flow battery ، nanostructures of lead dioxide ، cell efficiency.