金属钙离子浓度对PEMFC性能影响研究

EFFECT OF METALLIC CALCIUM ION CONCENTRATION ON PERFORMANCE OF PEMFC

通过向PEMFC阳极添加3种浓度(即50、200、500 mg/L)金属钙离子溶液,研究金属钙离子浓度对PEMFC性能的影响。实验结果表明,随着Ca^(2+)浓度增加,燃料电池电压不断降低。在电流密度为500 m A/cm^2,相同的污染时间9 h的条件下,经50、200、500 mg/L Ca^(2+)污染后的电池电压相对于未污染的电池电压分别降低了14%、29%、64%;燃料电池的最大功率密度随着金属Ca^(2+)浓度的增加而降低,经50、200、500 mg/L Ca^(2+)污染9 h后的电池最大功率密度相对于未污染的电池最大功率密度分别降低了24%、33%、43%。电池经500 mg/L Ca^(2+)污染6 h,在500 m A/cm^2电流密度下恒电流放电2 h后,电池电压降低了58%。这些结果表明,Ca^(2+)及其浓度对PEMFC的电化学性能有显著的影响。

The effect of the metallic calcium ion concentrations on the PEMFC performance was studied by adding the metallic calcium ion solutions with three kinds of concentrations （i.e. 50, 200 and 500 mg/L） into the anode of the PEMFC. The test results show that the voltage of PEMFC decreases gradually with the increase of Ca^2＋ concentration. Compared with voltage of the PEMFC without Ca^2＋ solution, under the identical current density of 500 mA/cm^2, the voltage of the PEMFC decrease 14%, 29% and 64% for the Ca^2＋ contaminations with the corresponding calcium ion concentrations of 50, 200 and 500 mg/L after the operating time of 9 hours, respectively. In addition, the maximum power density of the PEMFC decreases with the increase of Ca^2＋ concentration. Also compared with maximum power density of the PEMFC without Ca^2＋ solution, the maximum power density of PEMFC decrease 24%, 33% and 43% for the Ca^2＋ contaminations with the corresponding calcium ion concentrations of 50 mg/L, 200 mg/L and 500 mg/L after the operating time of 9 hours, respectively. continuously into the anode for 6 hours, of 500 mA/cm^2 for 2 hours. These results PEMFC performance. After the solution with calcium ion concentration of 500 mg/L poured the voltage decreases 58% under the constant discharging current show that calcium ion and its concentration have a significant effect density on the