Rychagov Alexey Yu, Sosenkin Valentin E, Izmailova Marianna Yu, Kabachkov Evgeny N, Shulga Yury M, Volfkovich Yury M, Gutsev Gennady L
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Pr. 31, 119071 Moscow, Russia.
Federal Research Center of Problem of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, 142432 Moscow, Russia.
Materials (Basel). 2023 Sep 26;16(19):6415. doi: 10.3390/ma16196415.
The self-discharge of an electric double-layer capacitor with composite activated carbon electrodes and aqueous electrolyte (1 M MgSO) was studied in detail. Under a long-term potentiostatic charge (stabilization), a decrease in the discharge capacity was observed in the region of voltages exceeding 0.8 V. The self-discharge process consists of two phases. In the initial phase, the cell voltage drop is due to the charge redistribution inside electrodes. During the main phase, the charge transfer between the electrodes determines the voltage drop. The optimal stabilization time of the self-discharge was found to be 50 min at 1.4 V. Hydrophilization of the negative electrode occurred during long-term polarization due to the formation of epoxy functional groups.
详细研究了具有复合活性炭电极和水性电解质（1 M MgSO）的双电层电容器的自放电情况。在长期恒电位充电（稳定化）下，在电压超过0.8 V的区域观察到放电容量下降。自放电过程由两个阶段组成。在初始阶段，电池电压降是由于电极内部的电荷重新分布。在主要阶段，电极之间的电荷转移决定了电压降。发现自放电的最佳稳定时间在1.4 V时为50分钟。由于环氧官能团的形成，在长期极化过程中负极发生了亲水化。
