流动电池
甲磺酸
氧化还原
法拉第效率
电化学
过电位
碳纤维
电流密度
复合数
锌
铈
化学
电池(电)
化学工程
材料科学
无机化学
分析化学(期刊)
电极
复合材料
冶金
电解质
环境化学
热力学
有机化学
物理化学
功率(物理)
工程类
物理
量子力学
作者
Georgios Nikiforidis,Rory Cartwright,David Hodgson,David Hall,Leonard Berlouis
标识
DOI:10.1016/j.electacta.2014.04.150
摘要
The Hull Cell was used to investigate the impact of current density j on the morphology and uniformity of zinc electrodeposited from a 2.5 mol dm−3 Zn2+ solution in 1.5 mol dm−3 methanesulfonic acid at 40 °C onto carbon-composite surfaces. The range of the applied deposition current density used was between 1 mA cm−2 and 100 mA cm−2. Good, robust deposits were obtained when j ≥ 10 mA cm_2 whereas at j's lower than this, patchy films formed due to the competing hydrogen evolution reaction (HER) on the bare carbon-composite surface. An understanding of these effects and its application in the redox flow battery enabled both the coulombic and cell potential efficiencies to be maintained at relatively high values, 90% and 69% respectively, indicating a successful inhibition of the HER on the fully formed Zn layer. Flow velocity at the low Reynolds number in the cell (Re <200) had little impact on the electrochemical cell performance. Depletion of the cerium species became an issue for long charge times.
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