不同气体相对湿度与氧气流量下梯度磁场对PEMFC工作性能的影响

Effect of gradient magnetic field on the work performance of PEMFC under different relative humidity and oxygen flow

文章在质子交换膜燃料电池(PEMFC)阳极侧加载强度为360 mT的梯度磁场,研究不同气体相对湿度与不同氧气流量下梯度磁场对PEMFC工作性能的影响。研究结果表明:在PEMFC阳极侧加载梯度磁场有利于提高PEMFC的工作性能;随着气体相对湿度的逐步升高,PEMFC的输出功率密度随之提升,且梯度磁场对不同气体相对湿度下的中、高电流密度区域的PEMFC工作性能有稳定的提升效果;当阴、阳极的气体相对湿度为100%时,加载梯度磁场后的PEMFC输出功率密度达到最高;当氧气与氢气的流量相同且较低时,梯度磁场对PEMFC的工作性能有大幅度的提升效果;当氧气流量大于氢气流量时,梯度磁场对PEMFC的影响在高电流密度区域更为显著,但过高的氧气流量会对PEMFC的工作性能起到抑制作用;在阳极侧垂直加载梯度磁场,能够降低PEMFC对环境的敏感性。

The influence of a gradient magnetic field to the work performance of proton exchange membrane fuel cell(PEMFC)has been discussed under diverse gas relative humidity and oxygen flow based on a 360 mT gradient magnetic field on the anode of PEMFC.The results show that the presence of a gradient magnetic field on the anode improves the work performance of PEMFC.The output power density of PEMFC increases with an increase of the gas relative humidity.Furthermore,the magnetic field enhances the work performance of the PEMFC stably in the medium and high current density regions under different gas relative humidity.When the relative humidity of the gas of the anode and the anode is 100%,the output power density of the PEMFC with loading the gradient magnetic field reaches the highest.When the oxygen flow is lower and equal to the hydrogen flow,the gradient magnetic field has a significant effect on the work performance of the PEMFC.When the oxygen flow is greater than the hydrogen flow,a more remarkable influence of the gradient magnetic field on the PEMFC appears in the high current density region.However,an excessive oxygen flow can inhibit the work performance of the PEMFC.The sensitivity of the PEMFC to environmental changes can be reduced by loading the gradient magnetic field on the anode.