Ink的状态对微型PEMFC氧电极Pt利用率的影响  

Influence of Ink configurations on Pt utilization of micro-PEMFC's oxygen electrode

作　　者：张熙贵[1] 夏保佳[1] 刘娟英[1] 郑丹[1] 徐乃欣[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所传感技术国家重点联合实验室,上海200050

出　　处：《电源技术》2006年第8期617-620,共4页Chinese Journal of Power Sources

基　　金：国家"863"计划资助项目(2003AA404120)

摘　　要：电化学极化实验表明,Ink(催化剂与溶剂在超声条件下形成的墨水状浆料)为胶体时,对应的微型质子交换膜燃料电池(PEMFC)氧电极极化性能相对于Ink为溶液时有明显提高。通过激光粒度实验和扫描电镜实验证实了Ink不同状态时对应的氧电极催化层空间状态和厚度存在较大差异。Ink为胶体时催化层Pt簇团聚粒子间隙较大,催化层厚度较低,有利于氧电极的反应传质过程,这是氧电极性能提高的根本原因。循环伏安实验结果发现,Ink为胶体时对应的氧电极Pt的利用率从25.2%提高到31.6%。In this paper, influence of different Ink configurations on Pt utilization of micro- PEMFC＇ s oxygen electrode was determined by experiments of electrochemistry polarization（EP）, laser particles（LP） and scan electronic microscope （SEM）. The results suggested that the catalyst layer of oxygen electrode made from colloidal ink has larger Pt agglomerates against that of solution ink. Thus, the clearance between the agglomerates intends to increase, which facilitates mass transport inside of oxygen electrode. Meanwhile, the bigger agglomerates seem to reduce the possibility of Pt particles＇ penetration deep into the diffusion layer. The above gives the final explanations of electrochemical polarization performance improvement of oxygen electrode.

关 键 词：微型质子交换膜燃料电池 氧电极 极化性能 Pt利用率 

分 类 号：TM911.4[电气工程—电力电子与电力传动]