Electrochemical impedance analysis with transmission line model for accelerated carbon corrosion in polymer electrolyte membrane fuel cells

Jeawoo Jung, Young Hoon Chung, Hee Young Park, Jonghee Han, Hyoung Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, So Young Lee, Kwang Ho Song, Hyun S. Park, Jong Hyun Jang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The effects of varying the applied voltage and relative humidity of feed gases in degradation tests of polymer electrolyte membrane fuel cells (PEMFCs) were analyzed using electrochemical impedance spectroscopy (EIS). A transmission line model that considers the proton-transport resistance in the cathode catalyst layer was used to analyze impedance spectra obtained from degraded PEMFCs. As the applied cell voltage was increased from 1.3 to 1.5 V to induce accelerated degradation, the cell performance decayed significantly due to increased charge- and proton-transfer resistance. The PEMFC degradation was more pronounce at higher relative humidity (RH), i.e. 100% RH, as compared with that observed under 50% RH. Furthermore, changes in the charge transfer resistance of the electrode accompanied changes in the ionic conductivity in the PEMFC catalyst layer. Although the initial ionic and charge-transfer resistances in the catalyst layer were lower under higher RH conditions, the impedance results indicated that the performance degradation was more significant at higher water contents in the electrode due to the consequential carbon corrosion, especially when higher voltages, i.e. 1.5 V, were applied to the PEMFC single cell.

Original languageEnglish
Pages (from-to)15457-15465
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume43
Issue number32
DOIs
Publication statusPublished - 2018 Aug 9

Keywords

  • Cathode degradation
  • Electrochemical impedance spectroscopy
  • Ionic resistance
  • Polymer electrolyte membrane fuel cell
  • Transmission line model

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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