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设计并建立甲醇渗透测试体系和模拟直接甲醇燃料电池(DMFC)运行体系,分别考察静态条件下H-cell中甲醇的渗透和运行条件下甲醇渗透对OCV的影响.循环伏安和计时电流法测试表明:随着渗透时间的延长,阴极侧的甲醇浓度增加;甲醇浓度增加,氧化峰电流增大,峰电位正移,氢在电极表面的吸脱附受到抑制,同时甲醇的正向氧化电流曲线出现肩峰.模拟DMFC实验测试结果表明:OCV先逐渐上升,接着发生突降,大约1.5 h后趋于稳定.
Methanol permeation test system and simulated direct methanol fuel cell (DMFC) operation system were designed and established to investigate the influence of methanol infiltration and static infiltration under static condition on the OCV respectively. Cyclic voltammetry and chronoamperometry The results showed that the concentration of methanol on the cathode side increased with the increase of the permeation time. The increase of methanol concentration increased the oxidation peak current and the peak potential was positive, and the adsorption and desorption of hydrogen on the electrode surface were inhibited. Meanwhile, the forward oxidation current curve Shoulder peaks appeared.The results of simulated DMFC experiment showed that the OCV firstly increased gradually and then dropped suddenly and stabilized after about 1.5 h.