Interpreting Ionic Conductivity for Polymer Electrolyte Fuel Cell Catalyst Layers with Electrochemical Impedance Spectroscopy and Transmission Line Modeling

Qi, Yongzhen; Liu, Jiangjin; Sabarirajan, Dinesh C.; Huang, Ying; Perego, Andrea; Haug, Andrew T.; Zenyuk, Iryna V.

doi:10.1149/1945-7111/abf96d

Title: Interpreting Ionic Conductivity for Polymer Electrolyte Fuel Cell Catalyst Layers with Electrochemical Impedance Spectroscopy and Transmission Line Modeling

Journal Article · Fri Apr 30 00:00:00 EDT 2021 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/abf96d· OSTI ID:1813388

^[1]; Liu, Jiangjin ^[2]; Sabarirajan, Dinesh C. ^[3];

^[1];

^[1]; Haug, Andrew T. ^[4];

^[5]

Univ. of California, Irvine, CA (United States)
Tufts Univ., Medford, MA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Tufts Univ., Medford, MA (United States)
3M Company, St. Paul, MN (United States)
Univ. of California, Irvine, CA (United States); Tufts Univ., Medford, MA (United States)

A cathode catalyst layer containing optimally distributed ionomer is critical to reduce the platinum loading and increase its utilization in polymer electrolyte fuel cells. Here, electrochemical impedance spectroscopy (EIS) was used to measure effective ionic conductivity of pseudo catalyst layers (PCLs) at a relative humidity (RH) range of 50%-120%. These results are compared to previous work using the hydrogen pump (HP) method. EIS effective ionic conductivity results reported here are higher than those from the HP because in the HP set-up ionic pathways must be effectively connected through the PCL to be counted, whereas in the EIS measurement, ionomer segments that are in contact with the membrane but are not effectively connected all the way through the PCL can be detected. Double layer capacitances and effective ionic conductivities of Pt/C catalyst layers with various supports and ionomer to carbon (I/C) ratios were studied. High surface area carbon support resulted in a lower effective ionic conductivity compared to the graphitized carbon support due to worse ionomer dispersion. Effective ionic conductivities of Pt/C layers were compared to that of PCLs. On average, effective ionic conductivities of Pt/C layers were higher than PCLs because of possible carbon agglomeratio n within the PCLs.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC02-05CH11231; EE0007650

OSTI ID:: 1813388

Journal Information:: Journal of the Electrochemical Society, Vol. 168, Issue 5; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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