4 years ago

High-Stability Electrodes for High-Temperature Proton Exchange Membrane Fuel Cells by Using Advanced Nanocarbonaceous Materials

High-Stability Electrodes for High-Temperature Proton Exchange Membrane Fuel Cells by Using Advanced Nanocarbonaceous Materials
Héctor Zamora, Jorge Plaza, Manuel A. Rodrigo, Justo Lobato, Pablo Cañizares
This work studies the stability and performance of a cathodic electrode for high-temperature proton exchange membrane (HT-PEMFC) systems prepared with a carbon nanosphere (CNS) based microporous layer and carbon nanofibers (CNFp) used as a catalyst support. The obtained results are compared with a standard Vulcan carbon XC72 based electrode. With this purpose, two membrane−electrode assemblies (MEAs) were prepared using the cathodic electrodes and tested in a 25 cm2 HT-PEMFC system. Preliminary short-life tests around 330 h were carried out with both MEAs. During the tests, different characterization procedures, consisting of polarization curves, spectroscopy impedance analysis, cyclic voltammetry and linear sweep voltammetry were performed in order to evaluate the evolution of the main stability and performance parameters of the MEAs. Results showed that the application of these new materials increases positively the stability of the MEA in comparison with the standard Vulcan carbon XC72 material, with a negligible decrease in the performance of the advanced MEA during all tests, making these results very promising to overcome the service lifetime limitations of these systems. Steady as a rock: Carbon nanospheres in the MPL and carbon nanofibers as catalyst supports have been used in electrodes for polybenzimidazole-based high-temperature proton exchange membrane fuel cells (HT-PEMFC). The fuel cell tests have demonstrated a very high stability of the membrane−electrode assemblies prepared with those advanced carbonaceous materials.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700699

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