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保壓時間對儲氫合金電極電化學(xué)性能的影響
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TG139

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內(nèi)蒙古自治區(qū)自然科學(xué)基金資助（項目號2010MS0804）；內(nèi)蒙古師范大學(xué)科研基金資助（項目號ZRYB09007）


Effects of the pressure-holding time on the electrochemical properties of Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3 metal hydride electrodes
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    摘要:

    在不同保壓時間下制備了Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3儲氫合金電極，研究了保壓時間對合金電極的活化性能、最大放電容量、放電特性和循環(huán)穩(wěn)定性的影響規(guī)律和機(jī)制。結(jié)果表明，保壓時間對合金電極的活化性能基本無影響，而合金電極的其他電化學(xué)性能隨著保壓時間的增大均呈現(xiàn)出先變好后變壞的變化規(guī)律，保壓時間為15min時，合金展示了最佳的綜合電化學(xué)性能，電化學(xué)性能的改善主要歸因于合金電極的電荷轉(zhuǎn)移速度加速和內(nèi)阻減小。

    Abstract:

    The Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3 metal hydride electrodes were prepared at a pressure-holding time of t (t=10, 15, 20 and 25 minutes). The effects of the pressure-holding time on the activation performance, maximum discharge capacity, discharge potential characteristic and cycle stability of the electrode were investigated. The mechanism of the effects of the pressure-holding time on the electrochemical properties of metal hydride electrodes was also discussed in detail. The results show that the other electrochemical properties of the electrodes improve firstly and then degenerate with increasing pressure-holding time but to have no effect on the activation performance. The electrode at pressure-holding time of 15 min exhibits the best electrochemical properties. The improvements of the electrochemical properties are attributed to the increase of the charge-transfer reaction rate on the alloy and the decrease of the internal resistance of the electrodes.

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田曉,劉向東,姚占全,海山.保壓時間對儲氫合金電極電化學(xué)性能的影響[J].稀有金屬材料與工程,2012,41(5).[TianXiao, Liu Xiangdong, Yao Zhanquan, Hai shan. Effects of the pressure-holding time on the electrochemical properties of Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3 metal hydride electrodes[J]. Rare Metal Materials and Engineering,2012,41(5).]
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  • 收稿日期:2011-05-08
  • 最后修改日期:2011-05-08
  • 錄用日期:2011-08-03
  • 在線發(fā)布日期: 2012-10-17
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