电解二氧化锰的掺钛研究

RESEARCH ON THE DOPED TITANIUM ELECTROLYTIC MANGANESE DIOXIDE

在硫酸锰和氯化锰体系中加入浓度相同的钛（Ⅲ）盐，可制得掺钛量不同的电解二氧化锰（ＥＭＤ）。ＢＥＴ比表面积测定、Ｘ光电子能谱、红外光谱分析、阴极电位扫描和恒电流放电实验表明：掺钛ＥＭＤ的空腔内表面积变大，钛离子在ＥＭＤ颗粒表层被大大富集。掺进的ＴｉＯ２进入ＥＭＤ的晶格，钛使得Ｍｎ－Ｏ键强度下降。含钛量为０．２５～０．４％的ＥＭＤ（化学式为ＭｎＯｘ）在碱液中放电时，当ｘ＞１．８０，钛对ＭｎＯｘ放电无明显的影响；当ｘ＞１．７５，且放电深度为放电的第一步时，钛使ＥＭＤ的放电极化变小。

?When mixing Ti(Ⅲ) salt with MnSO 4H 2SO 4 or MnCl 2HCl system, we can obtain the doped titanium electrolytic manganese dioxide (EMDTi) by the electrochemical method. The data of the BET area, XPS, IR, the sweep of controlled potential and discharge at 7.5 mA current show: the inner surface area of gap in EMDTi particle is increased, Ti atom is richened on the surface of MnO 2 particle. Doped TiO 2 is entered into MnO 2 lattice and also cause the binding energy of MnO band to be decreased. When MnO x with 0.250.40% Ti are discharged in 9 mol/L KOH solution, if x>1.80, discharge reaction is slightly affected by doped Ti; if x<1.75 and the discharge depth is in first step of discharge reaction, the polarization of EMDTi electrode is less. [WT5”,6HZ]