二氧化锰电极现场透射X射线吸收谱研究

In Situ X-Ray Absorption Spectroscopic Study of Manganese Dioxide

运用现场透射X射线吸收谱法对可充碱锰电池的二氧化锰电极在放电过程中的结构变化进行了研究.结果表明放电过程中二氧化锰中的锰发生了结构重排,[MnO6]八面体的角边共享的程度发生了变化.随放电深度的增大,锰的第一近邻的配位数减小,Mn- O键键长增大.

Changes in the structure of a MnO 2 electrode as it was discharged in a rechargeable MnO 2/Zn battery have been investigated by in situ transmission Xray absorption spectroscopy. During the discharging,Mn in MnO 2 has rearranged and the extent of cornertoedgesharing in the [MnO 6] octahedral units has changed. With the increasing of the depth of discharge, the coordination numbers of the first shell decreased and the Mn O distance increased.