کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1282262 1497551 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Degradation mechanism study of PTFE/Nafion membrane in MEA utilizing an accelerated degradation technique
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Degradation mechanism study of PTFE/Nafion membrane in MEA utilizing an accelerated degradation technique
چکیده انگلیسی

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.The scanning 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.


► MEA performance with PN is lower than with N211 due to lower conductivity of PTFE.
► PN membrane is more durable and safer than Nafion after become ruptured.
► Creep deformation of PN membrane leads to Rohm increase and lower MEA durability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 18, September 2012, Pages 13623–13630
نویسندگان
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