Título: Fuel CellsImportada do Authenticus Pesquisar Publicações da Revista

Vol. 13 Nº 2

Páginas: 203-216

ISSN: 1615-6846

Editora: Wiley-Blackwell

ISI Web of Knowledge - 10 Citações

ISI Web of Science

Scopus - 11 Citações

INSPEC

FOS: Ciências da engenharia e tecnologias > Engenharia química

ID Authenticus: P-005-1YS

DOI: 10.1002/fuce.201200109

Abstract (EN): Adequate water management is crucial to increase stability and durability of Polymer Electrolyte Membrane Fuel Cells. In this paper, a test rig suitable for water balance and nitrogen crossover studies was built around a hydrogen-air segmented cell and used to indirectly assess flooding or drying conditions in specific zones of the active cell area. In particular, the anode of the segmented cell was operated in recirculation mode with continuous water removal. Current density distribution (CDD) diagrams were obtained for different anode operating parameters, namely, the recirculated gas flow rate, anode pressure, and time between purges. Water accumulation at the electrodes was assessed from CDD diagrams and confirmed using water balance and flow-patterns calculations. It was concluded that lower recirculation flow rates led to flooding due to decreased water removal capabilities at the anode. For higher recirculation flow rates, drying was observed in one zone of the cell but homogeneous CDD in the other. Finally, the use of partially segment bipolar plates was proposed to increase the in-plane electrical resistance between adjacent segments. The partial segmentation increased the segment to segment in-plane electrical resistance between 14 and 21% and decreased the through-plane to in-plane resistance ratio by 17%.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Notas: Publicação abrangida pelo Journal Citation Reports 2015

Nº de páginas: 14