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首页> 外文期刊>Advanced Functional Materials >Fabrication of a 'soft' membrane electrode assembly using layer-by-layer technology
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Fabrication of a 'soft' membrane electrode assembly using layer-by-layer technology

机译：使用逐层技术制造“软”膜电极组件

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A new type of thin-film electrode that does not utilize conducting polymers or traditional metal or chemical vapor deposition methods has been developed to create ultrathin flexible electrodes for fuel cells. Using the layer-by-layer (LbL) technique, carbon-polymer electrodes have been assembled from polyelectrolytes and stable carbon colloidal dispersions. Thin-film LbL polyelectrolyte-carbon electrodes (LPCEs) have been successfully assembled atop both metallic and non-metallic, porous and their non-porous substrates. These electrodes exhibit hi h electronic conductivities of 2-4 S cm(-1) and their porous structure provides ionic conductivities in the range of 10(-4) to 10(-3) S cm(-1). The electrodes show remarkable stability towards oxidizing, acidic, or delaminating basic solutions. In particular, an LPCE consisting of poly(diallyldimethyl ammonium chloride)/polv(2-acrylamido-2methyl- I -propane sulfonic acid)/carbon-platinum assembled on a porous stainless steel support yields an open-circuit potential similar to that of a pure platinum electrode. With LbL carbon-polymer electrodes, the membrane-electrode assembly (MEA) in a fuel cell can be made several times thinner, assume multiple geometries, and hence be more compact. The mechanism for LPCE deposition, electrode structure, and miniaturization will be presented and discussed, and demonstrations of the LbL electrodes in a traditional Nafion-based proton fuel cell and the first demonstration of a thin-film hydrogen-air "soft" fuel cell fully constructed using multilayer assembly are described.
机译：已经开发出一种不使用导电聚合物或传统金属或化学气相沉积方法的新型薄膜电极，以制造用于燃料电池的超薄柔性电极。使用逐层（LbL）技术，碳聚合物电极已经由聚电解质和稳定的碳胶体分散体组装而成。薄膜LbL聚电解质碳电极（LPCE）已成功地在金属和非金属，多孔及其无孔基材上组装。这些电极的电子电导率为2-4 S cm（-1），其多孔结构提供的离子电导率为10（-4）到10（-3）S cm（-1）。电极对氧化，酸性或分层碱性溶液表现出显着的稳定性。特别是，由聚（二烯丙基二甲基氯化铵）/ polv（2-丙烯酰胺基-2-甲基-1-丙烷磺酸）/碳-铂组成的LPCE，组装在多孔不锈钢载体上，产生的开路电位类似于纯铂电极。使用LbL碳聚合物电极，可以使燃料电池中的膜电极组件（MEA）变薄几倍，采用多种几何形状，因此更加紧凑。将介绍和讨论LPCE沉积的机理，电极结构和小型化，以及在传统的基于Nafion的质子燃料电池中的LbL电极的演示，以及首次对薄膜氢-空气“软”燃料电池进行完全演示的示例。描述了使用多层组件构造的结构。

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