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－ ０．２ Ｖ 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）。
The electrochemical behavior of nanophase \%γ\%\|MnO\-2 produced 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\%\|MnO\-2 has a better electrochemical activity than International Common Sample 1(electrolytic mangnese dioxide, abbreviated in S). Their discharge capacities were higher than that of S especially at the second discharge step. This favorable performance was more remarkable under the condition of heavy load discharge. A relatively 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 MnO\-2 is 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 S after -0.2 V, and dissolution and deposition for Mn(Ⅲ) and Mn(Ⅱ) species are also easier in nanophase MnO\-2 than in S in the second discharge step.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第10期1584-1588,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
纳米材料
二氧化锰
固相合成
Nanophase electrode material
\%γ\%\|Manganese dioxide
Cyclic voltammetry
Constant current discharge
Discharge capacity
