Effect of electrolyte concentration on low-temperature electrochemical properties of LaNi5 alloy electrodes at 233 K
来源期刊:JOURNAL OF RARE EARTHS2008年第3期
论文作者:TAO Mingda CHEN Yungui ZHANG Xiaoyan WU Chaoling
Key words:hydrogen storage alloy; low-temperature electrochemical characteristic; LaNi5; rare earths;
Abstract: The effect of KOH electrolyte concentration on low-temperature electrochemical properties of LaNi5 alloy electrodes at 233 K was studied. The results indicated that the electrolyte concentration had great influence on discharge capacity and discharge voltage plateau of LaNi5 alloy electrode at 233 K, and the highest discharge capacity and discharge voltage plateau were both obtained at 6 mol/L KOH. When the KOH electrolyte concentration changed from 5 to 9 mol/L at 233 K, the high rate discharge ability (HRD) had the same change tendency as the diffusion coefficient, but the exchange current density did not change significantly, which implied that hydrogen diffusion was the control step at low temperature 233 K for discharge process of LaNi5 alloy electrode.
TAO Mingda1,CHEN Yungui1,ZHANG Xiaoyan1,WU Chaoling1
(1.School of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China)
Abstract:The effect of KOH electrolyte concentration on low-temperature electrochemical properties of LaNi5 alloy electrodes at 233 K was studied. The results indicated that the electrolyte concentration had great influence on discharge capacity and discharge voltage plateau of LaNi5 alloy electrode at 233 K, and the highest discharge capacity and discharge voltage plateau were both obtained at 6 mol/L KOH. When the KOH electrolyte concentration changed from 5 to 9 mol/L at 233 K, the high rate discharge ability (HRD) had the same change tendency as the diffusion coefficient, but the exchange current density did not change significantly, which implied that hydrogen diffusion was the control step at low temperature 233 K for discharge process of LaNi5 alloy electrode.
Key words:hydrogen storage alloy; low-temperature electrochemical characteristic; LaNi5; rare earths;
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