Title of article :
Degradation mechanism study of PTFE/Nafion membrane in MEA utilizing an accelerated degradation technique
Author/Authors :
Jao، نويسنده , , Ting-Chu and Jung، نويسنده , , Guo-Bin and Kuo، نويسنده , , Shun-Chi and Tzeng، نويسنده , , Wei-Jen and Su، نويسنده , , Ay، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
8
From page :
13623
To page :
13630
Abstract :
Nafion membranes are widely used for commercial membrane electrode assemblies (MEAs) in proton exchange fuel cells (PEMFCs). The polytetrafluoroethylene (PTFE)/Nafion (PN) composite membrane has the advantages of being low in cost, high in mechanical strength, and does not swell excessively. This study focuses on the properties of PTFE/Nafion membranes and PTFE/Nafion MEAs by comparing the durability and performance of the PN MEAs to commercial Nafion 211 MEAs. In an accelerated degradation test (ADT), the characterization of PTFE/Nafion and Nafion MEAs were analyzed using in-situ electrochemical methods such as polarization curves, AC impedance, cyclic voltammetry (CV), and linear sweep voltammetry (LSV). The results demonstrate an increase in the internal resistance on the PTFE/Nafion MEA only. The three mechanisms behind this unique result were proposed to be: (a) Separation of the catalyst layer from the membrane due to creep deformation; (b) Separation of the outer Nafion layer film from the core PTFE/Nafion membrane due to creep deformation; (c) Degradation of the Nafion plane (or Nafion dissolution) from the PTFE surface. anning electron microscope (SEM) images indicate that only the PTFE/Nafion MEA curved after the ADT. Mechanism (a) was therefore the most possible phenomenon for the increase in internal resistance of the PN MEA.
Keywords :
Proton exchange membrane fuel cell (PEMFC) , PTFE/Nafion (PN) composite membrane , Accelerated degradation test (ADT) , Creep deformation , degradation mechanisms
Journal title :
International Journal of Hydrogen Energy
Serial Year :
2012
Journal title :
International Journal of Hydrogen Energy
Record number :
1672999
Link To Document :
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