生成水形态对Pt-ACF内氢氧催化反应的影响  

Influence of water production on hydrogen-oxygen reaction in Pt-ACF

作　　者：李雄威[1] 彭晓峰[1] 谭勤学[1] 叶长流[1] 

机构地区：[1]清华大学热能工程系相变与界面传递现象实验室,北京100084

出　　处：《热科学与技术》2009年第2期106-111,共6页Journal of Thermal Science and Technology

基　　金：国家自然科学基金重点资助项目(50636030)

摘　　要：针对质子交换膜燃料电池(PEMFC)膜电极反应过程特性,进行简化的载Pt活性炭纤维(Pt-ACF)多孔材料氢氧催化反应模拟实验。实验中利用微CT、红外测温仪和CCD对装入塑料圆管的Pt-ACF催化多孔层在不同反应时段下的内外水形态进行可视化实验观察分析。结果表明,Pt-ACF略微润湿时,氢氧催化反应的反应率很高;当Pt-ACF局部含水后,下一时段平均反应率会降低,且Pt-ACF内部含水量与平均反应率呈负相关;Pt-ACF周围的水蒸气也会反应产生影响。The membrane electrode reaction in proton exchange membrane fuel cells （PEMFC） by a simplified hydrogen-oxygen reaction in activated carbon fiber （Pt-ACF） samples was simulated. The water production and evolution inside and outside the Pt-ACF in a plastic tube was visualized and analyzed by micro-CT, CCD and infrared thermometer during hydrogen-oxygen reaction. Results indicate that the hydrogen-oxygen reaction rate is high when Pt-ACF is slightly wetted. When Pt-ACF is partly aqueous, the average reaction rate is decreased, and the moisture content of Pt-ACF and the average reaction rate are negatively correlated. Water vapor around the Pt-ACF samples also has some impact on the reaction.

关 键 词：质子交换膜燃料电池 膜电极 Pt活性炭纤维 氢氧催化反应 水态演化 

分 类 号：TM911.4[电气工程—电力电子与电力传动]