甲醇浓度对被动式自呼吸直接甲醇燃料电池性能的影响

Effect of methanol concentration on the operation performances for passive air-breathing direct methanol fuel cell

依据单电池测试结果和甲醇传质理论考察了甲醇溶液的浓度对被动式自呼吸直接甲醇燃料电池(DMFC)性能的影响.研究结果表明,电池的法拉第效率和能量转化效率会随着浓度的增大而降低,采用4mol/L的甲醇溶液实现了最大的放电功率13.9mW/cm2,并能在60mA下稳定放电长达20h.这取决于电池运行过程中电极内部的甲醇传质和甲醇透过的共同作用.

The effect of methanol concentration on the performances for passive air-breathing direct methanol fuel cell（DMFC） was studied by single cell tests and methanol transfer theory.With the increase of methanol concentration,the Faradic efficiency and energy efficiency were decreased due to the methanol crossover effect.The maximum power density of 13.9 mW/cm^2 and a 20-hour stable performance at a discharge current of 60 mA were obtained under the methanol concentration of 4 mol/L.The above results could be attributed to the synergy of methanol transport and methanol crossover.