影响贮氢电极性能因素的研究(Ⅰ)——电极制作条件和电解液浓度及添加物的影响

贮氢电极的制片压力增大,其快速放电能力增强,放电容量随循环次数增加衰减速度减慢;电极中TAB(聚四氟乙烯化的乙炔黑)含量增加,放电容量虽略有增大,但电荷保持能力明显下降,随着电解液浓度的增加,电极放电容量增大、充电效率提高、快速放电能力增强,自放电率降低,但6mol·L~(-1)以上电极性能变化不明显,说明电解液浓度至少要为6mol.L~(-1);在电解液中添加少量的PdCl_2,可使电极活化次数减少,放电电位显著提高,并对电极的交流阻抗图谱和循环伏安曲线有较大影响.

Influence of manufacture conditions of electrode, electrolyte concentration and additive on the properties of hydrogen storage electrodes. Part I

The fast discharge ability and cycle life of hydrogen storage (MH) electrodes were affected by manufacturing pressure of electrode. Adding TAB content, the discharge capacity of MH electrodes were increased, but charge retention ability were lowered. The discharge capacity, charge efficiency, fast discharge ability and selfdischarge rate of MH electrode were found to be improved by increasing the electrolyte concentration, however, the changes weren't distinct as electrolyte concentration was above 6mol.L-1. The performances of MH electrodes such as activation process, discharge potential, cyclic voltammetry curves and a. c. impedance diagram were influenced by the addition of small amounts of PdCl2 to electrolyte solution.