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COMPOSITE MEMBRANES FOR HIGH TEMPERATURE OPERATION OF PROTON-EXCHANGE MEMBRANE FUELS CELLS

机译:质子交换膜燃料细胞高温操作复合膜

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Development of hydrogen/oxygen proton-exchange membrane fuel cells (PEMFCs) operating above 120°C could help to alleviate some of the technical issues associated with adapting present PEMFCs technology to applications such as transportation and small-scale power generation. At typical operating temperatures of around 80°C. problems with CO poisoning of the platinum anode catalyst, and thermal and water management make the development of a simple and reliable fuel cell system more difficult. Use of hydrocarbon or alcohol fuels such as natural gas, gasoline, or methanol are more economically and technically viable in the near-term than using hydrogen. As a result, the hydrogen-rich gas will contain a significant concentration of CO and methods of reducing the impacts of this CO (either by oxidation or increasing PEMFC tolerance) become important. Increasing the temperature of fuel cell operation reduces the adsorption of CO onto the platinum electrocatalyst. In addition, temperature of the fuel cell stack is greatly enhanced at high temperatures through more efficient heat exchange. At high temperatures, water is produced as a vapor and cathode-flooding problems can be alleviated as well as producing a more valuable waste heat that could be used in a secondary application.
机译:在120°C以上工作的氢气/氧质素 - 交换膜燃料电池(PEMFC)可以帮助缓解与适应当前PEMFCS技术相关的一些技术问题,以与运输和小规模发电等应用。在典型的工作温度约为80°C。铂阳极催化剂的CO中毒问题,热量和水管理使得一种简单可靠的燃料电池系统的开发更加困难。使用烃或醇燃料如天然气,汽油或甲醇,在近术中比使用氢气更经济和技术上可行。结果,富含氢气的气体将含有显着浓度的CO和降低该CO的影响的方法(通过氧化或增加Pemfc耐受)变得重要。增加燃料电池操作的温度降低了CO的吸附到铂电催化剂上。此外,通过更有效的热交换,在高温下大大提高了燃料电池堆的温度。在高温下,水产生水作为蒸气,并且可以缓解阴极泛滥问题,也可以减轻可以在二级应用中使用的更有价值的废物热量。

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