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Author(s): Marta Boaventura
Isabel Alves
Paulo Ribeirinha
Adélio Mendes
Title: The influence of impurities in high temperature polymer electrolyte membrane fuel cells performance
Issue Date: 2016
Abstract: This work investigates the influence of carbon dioxide and non-reacted methanol, presentin the reformate stream obtained via methanol steam reforming, in the performance ofhigh temperature polymer electrolyte membrane fuel cells (HT-PEMFC), operating between160 C and 180 C.The HT-PEMFC anode was fed with pure hydrogen, hydrogen balanced with carbondioxide (75%/25% vol.) and synthetic reformate mixture, considering also vaporizedmethanol solution in the reformate content (up to 10% vol.). The synthetic reformate wasfeed during cycles of 420 min. The fuel cell was characterized based on the polarizationcurve and electrochemical impedance spectroscopy (EIS) analysis. Additionally, acidebasetitrations were performed to access the phosphoric acid content in different sections of theMEAs as well as scanning electron microscopy (SEM).A low impact in the fuel cell performance was observed when three cycles of syntheticreformate containing methanol solution were performed. When the number of cycles wasincreased, the performance of HT-PEMFC decreases and irreversible degradation of performance was observed. The cycles with synthetic reformate increased the ohmic resistance and high frequency resistance associated with anodic processes, but decreased theintermediate frequency resistance associated with cathodic processes. Additionally, byincreasing the number of cycles, the phosphoric acid content of Celtec® MEAs and thethickness of the membrane decreased.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/303476/Integrated low temperature methanol steam reforming and high temperature polymer electrolyte membrane fuel cell/BeingEnergy
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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