电极组分对质子交换膜燃料电池性能的影响

Effect of electrode composition on the performance of proton exchange membrane fuel cell

在疏水碳纸中加入聚四氟乙烯(PTFE)并增加其含量,实验表明,过多的PTFE的加入,降低了碳纸的电导率,阻塞了气体电极的孔隙,导致电池性能下降,20% PTFE的含量较为合适;在催化层中添加造孔剂,增大了空气中氧气和电极的接触面积,减小了扩散极化,提高了电池的性能,使电池在Pt载量为0.5 mg ·cm-2、常压氢气和空气的操作条件下,其功率密度达到了0.3 W·cm-2 。

The tests of adding and increasing the content of polymer-tetra fluorine-ethylene (PTFE) to hydroholic carbon paper were studied. The results show that if the content of PTFE is too much, the conductivity and porosity of the paper decreases, as a result the battery performance is lowered. 20% PTFE content is best. The addition of pore former in catalyst increases the connecting area between oxygen in air and electrode, decreases diffusing polarization, and increases battery performance. As a result air operation at ambient pressure and low catalyst Pt loading of 0.5mg·cm-2 a power density of 0.3W·cm-2 can be obtained.