【摘要】 根据二氧化锰及其还原产物的一些晶型变体的结构,提出γ—MnO₂充电不可逆性的可能原因。综合文献上的结果,阐明γ—MnO₂的第一放电阶段是均相固相反应的论证。用动电位扫描描方法,研究了石墨上电沉积二氧化锰薄层电极的电极行为。对不同浓度的KOH溶液、不同的扫描速度、以ZnO饱和等条件下,进行测定。结果表明第一放电阶段及第二放电阶段,在这种情形下分别符合均相固相反应及溶解—沉积机理。在第二阶段放电受到阻碍的情况下,纵然扫描电位进入第二放电阶段的电位区,电极仍有一定的可充电性。这可能是解决二氧化锰电极的可充电性的一种有效措施。更多还原

【Abstract】 From the resemblance and dissimilarity of the crystal structure ofseveral modifications of MnO₂ and its reduction products, a possiblecause of the inability for reversal charging is advanced. Summing uprecent development in literature about the mechanism of the Ist stageof discharge of the MnO₂ electrode, experimental evidences for thehomogeneous solid phase mechanism are Presented. according to themultiple potential sweep curves of thin film MnO₂ electrodes electrode-posited on graphite in KOH solutions of various concentration, thehomogeneous solid phase mechanism for the lst stage and solution--precipitation mechanism for the 2nd stage of discharge are againindicated. accorging to the multiple potential sweep curves in thepotential realm of the lst stage of discharge as well as in 1N KOHwhere the 2nd stage of discharge is seriously hindered, a certain degreeof rechargeability is manifested, thus suggesting that by employingmeans of hindering the 2nd stage of discharge, we might be able to find ctive and convercient way of enhancing the rechargeability ofMnO₂ electrodes. Solutions of 9N KOH saturated with ZnO are also investigated,deteriorative effect is observed.更多还原