部分卸载时被动式燃料电池动态响应实验研究

Experimental Investigation of Dynamic Response to Partially Relieving of Load of Passive Fuel Cells

对全被动式直接甲醇燃料电池在电流部分卸载情况下的输出电压动态响应开展了实验研究。实验结果显示,电流按照方波、后直角三角波、前直角三角波和等腰三角波加载/卸载时的燃料电池输出电压动态响应规律不尽相同。燃料电池在高电流强度加载时,不同甲醇溶液浓度时的电池输出电压比较接近。在电流部分卸载的情况下,1mol/L甲醇溶液浓度时燃料电池的输出电压高于3mol/L甲醇溶液浓度时的输出电压。从被动式燃料电池内部传质过程与电化学反应耦合的角度对实验结果开展了分析。

Dynamic response of cell voltage to partially relieving of current load of a fully passive direct methanol fuel cell has been studied experimentally.The experimental results show that when square wave,front right-angled,rear right-angled and isosceles triangular wave of current densities are loaded/relieved,output voltage of fuel cells is different,but it becomes to be close in high current density region.Cell voltage with methanol concentration of 1 mol/L is higher than that with methanol molarity of 3 mol/L when the current is partially relieving.The analysis and discussions of mass transfer coupling with electrochemical reactions inside passive fuel cell have been conducted to explain the experimental results.