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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—MnO_2充电不可逆性的可能原因。综合文献上的结果,阐明γ—MnO_2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。
Based on the structure of some crystal modifications of manganese dioxide and its reduction products, the possible reasons for the irreversibility of γ-MnO 2 charging were proposed. Based on the results of the literature, it is demonstrated that the first discharge phase of γ-MnO 2 is a homogeneous solid phase reaction. Electrokinetic potential scanning method was used to study the electrode behavior of electrodeposited manganese dioxide thin-film electrode. Different concentrations of KOH solution, different scanning speed, saturated with ZnO and other conditions were measured. The results show that the first discharge phase and the second discharge phase, respectively, in this case consistent with the homogeneous solid-phase reaction and dissolution - deposition mechanism. In the case that the discharge in the second stage is hindered, the electrode still has a certain chargeability even though the scan potential enters the potential region of the second discharge stage. This may be an effective measure to solve the chargeability of the manganese dioxide electrode.