直接甲醇燃料电池的单电池实验测试及性能优化

Experimental Test and Performance Optimization of Single Cell in Direct Methanol Fuel Cell

以新型阻醇材料Na2Ti3O7/Nafion复合膜为质子交换膜,利用热压法制备膜电极(MEA),对直接甲醇单电池进行测试.考察了电池温度、阴极加湿温度、甲醇浓度、甲醇流速和空气流速5个参数对直接甲醇燃料电池极化曲线性能的影响.实验结果表明,电池温度对电池性能的影响较为明显,提高电池温度有利于得到较好的电池性能.甲醇浓度对电池性能影响也比较明显,较低甲醇浓度有利于提高电池性能.甲醇流速和空气流速对电池性能的影响较小,阴极加湿温度对电池性能几乎没有影响.通过分析优化,该直接甲醇燃料电池的电池性能最佳工作条件是在80℃情况下,低电流密度工作区采用较低浓度甲醇溶液,高电流密度工作区采用高浓度甲醇溶液.

With new composite membrane materials of Na2Ti3O7/Nafion for proton exchange membrane,Membrane Electrode Assembly（MEA）was prepared using hot-pressing method,and had been tested in single direct methanol fuel cell.Operation parameters of cell temperature,cathode humidifying temperature,methanol concentration,methanol flow rate and air flow rate have been employed to study on the effect of direct methanol fuel cells polarization curve.Experimental results show that the effect of cell temperature on the cell performance is obvious,so increase cell temperature is helpful to get better cell performance.Effect of methanol concentrations on cell performance is also obvious.The lower methanol concentration is favorable to improve cell properties.The effect of methanol flow rate and air flow rate to the cell performance is lesser.Effect of cathode humidification temperature on cell performance almost has no effect.Through the analysis and optimization,the better operation conditions of direct methanol fuel cells is in cell temperature of 80 ℃,and the low concentration of methanol when the cell works in low current density,or high concentrations of methanol when the cell works in high current density.