CO对PEMFC性能影响研究

天然气、甲醇等碳氢化合物重整制氢作为燃料正在应用到质子交换膜燃料电池领域。为系统地研究重整气中CO对质子交换膜燃料电池性能的影响,采用热压法自制膜电极,研究了CO浓度、催化剂种类、操作温度、增湿操作等因素对质子交换膜燃料电池性能的影响。实验结果表明:20×10~(-6) CO浓度即能使电池性能显著下降60%~70%;Pt Ru/C催化剂对抗CO中毒的能力较Pt/C催化剂有明显提升,在100×10~(-6) CO浓度下能使性能提高70%;提高工作温度能有效地改善阳极CO中毒状况,在50×10~(-6) CO浓度并加湿的条件下,当操作温度从80℃提高到120℃时电池性能可增加一倍。同时增湿操作有利于改进电池在低浓度CO下的发电性能。

Effect of CO on performance of PEMFC

The hydrogen produced from reforming of hydrocarbon (e.g.natural gas and methane) is becoming practical in the field of proton exchange membrane fuel cell (PEMFC).To systemically investigate the effect of CO involved in the reforming gas on the performance of PEMFC,the influence of many parameters such as CO concentration,catalyst species,operation temperature and humidifying conditions on the performance of PEMFC was studied using membrane electrode prepared by hot pressing method.The experimental results indicate that CO concentration as much as 20 × 10-6 would lead to the decay of cell performance by 60％-70％.The catalyst PtRu/C shows significant improvement against CO poisoning of CO when compared with catalyst Pt/C,and the performance of PEMFC is enhanced by 70％ when the concentration of CO achieves 100 × 10-6.Higher temperature can alleviate the anode from CO poisoning effectively,the cell performance can be doubled as the temperature rises from 80 ℃ to 120 ℃ when 50 × 10-6 CO and humidifying condition is employed.Meanwhile,the humidifying is beneficial for the performance improvement of electricity generating at low CO concentration.