流动电池
钒
硝酸
氧化还原
石墨
材料科学
电化学
电极
无机化学
化学
X射线光电子能谱
硫酸
化学工程
电池(电)
电解质
核化学
有机化学
工程类
功率(物理)
物理
物理化学
量子力学
作者
Bianting Sun,Maria Skyllas‐Kazacos
标识
DOI:10.1016/0013-4686(92)87084-d
摘要
The surface modification of graphite felt with concentrated sulphuric acid has led to dramatic improvement in the electroactivity of this material in the vanadium redox cell. A cell resistance of 2.50 Ω cm2 and energy efficiency of 91% were obtained in the vanadium cell, after the graphite felt electrode material was treated with boiling concentrated sulphuric acid for 5h. The electrochemical activity of the graphite felt was found to increase with increasing sulphuric acid concentration. Treatment of graphite felt with nitric acid and mixtures of sulphuric and nitric acids, however, led to higher cell resistance values compared with the sulphuric acid treatment. Surface analysis of treated and untreated felts using the XPS method has shown that the functional groups CO and CO increased dramatically compared with untreated samples. A sequence reaction mechanism was proposed for the VO2+ ⇌ VO+2 and V2+ ⇌ V3+ charge-discharge reactions occurring in the positive and negative 12-cells, respectively of the vanadium redox battery.
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