高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (10): 1584.

• 论文 • 上一篇    下一篇

纳米MnO2的固相合成及其电化学性能研究(Ⅱ)纳米V-MnO2的电化学性能

夏熙, 李娟, 李清文   

  1. 新疆大学应用化学研究所, 乌鲁木齐 830046
  • 收稿日期:1998-08-10 出版日期:1999-10-24 发布日期:1999-10-24
  • 通讯作者: 夏熙,男,67岁,教授.
  • 作者简介:夏熙,男,67岁,教授.
  • 基金资助:

    国家自然科学基金(批准号:29563007)资助课题

Synthesis and Electrochemical Properties of Nanophase MnO2by Solid-phase Reaction(Ⅱ)--Electrochemical Properties of Nanophase γ-MnO2

XIA Xi, LI Juan, LI Qing-Wen   

  1. Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, China
  • Received:1998-08-10 Online:1999-10-24 Published:1999-10-24

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摘要： 用循环伏安(CV)和恒流放电及充放电技术测试了固相方法合成的纳米γ-MnO2的电化学性能.结果表明,纳米γ-MnO2在碱性电解液中具有优良的电化学活性.纳米样品在-0.2V之后极化程度变小,电位下降的趋势明显减慢.重负荷放电时,纳米微粒样品显示出更大的优势,放电容量大幅度增加.CV图中显示,纳米MnO2的峰电流明显大于国际1号电解二氧化锰样品(记为S)的峰电流,表明在纳米样品中,质子、电子的嵌入和脱出以及Mn(Ⅲ)、Mn(Ⅱ)的溶解和沉积比S样中更易进行.

关键词: 纳米电极材料, &gamma, -MnO2, 循环伏安, 恒流放电, 放电容量

Abstract: The electrochemical behavior of nanophase γ-MnO2produced by the decomposition of coordination compound precursors and then acid treatment was investigated by using cyclic voltammetry and constant current charge/discharge tests. The results indicated that the nanophase γ-MnO2has a better electrochemical activity than International Common Sample 1(electrolytic mangnese dioxide, abbreviated in S). Their discharge capacities were higher than that of Sespecially at the second discharge step. This favorable performance was more remarkable under the condition of heavy load discharge. Arelatively strong polarization was shown at the beginning of the discharge stage and then strong depolarizable ability in the following stage. CV curves show that the peak current of nanophase MnO2is obviously larger than that of S, and it can be concluded that insertion and deinsertion for protons into the tunnels of crystal lattice of nanophase mangnese dioxide are easier than Safter-0.2 V, and dissolution and deposition for Mn(Ⅲ) and Mn(Ⅱ) species are also easier in nanophase MnO2than in Sin the second discharge step.

Key words: Nanophase electrode material, γ-Manganese dioxide, Cyclic voltammetry, Constant current discharge, Discharge capacity

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