Effects of self-humidification on the dynamic behavior of polymer electrolyte fuel cells

Yongtaek Lee, Bosung Kim, Yong Chan Kim

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The dynamic behavior of polymer electrolyte fuel cells was investigated experimentally at sudden load change conditions. The present study mainly focused on the variation of membrane hydration due to self-humidification. Steady-state results for various temperatures and humidities were used as the basic data for the analysis of dynamic behavior. Electrochemical impedance spectroscopy (EIS) showed that the ohmic resistance was reduced with the increase of humidity and current while the total polarization resistance including the mass transfer effect showed various trends according to cell temperature. The dynamic behavior of the cells was measured with time. The current increment just after an abrupt voltage reduction jumped to a certain level and then increased gradually, showing a logarithmic-shape curve. The stabilization time to steady-state was determined by using the curve-fitted lines representing the variation of the current increment at each operating condition. The stabilization time showed various trends according to cell temperature, humidity, and voltage range.

Original languageEnglish
Pages (from-to)1999-2007
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number4
DOIs
Publication statusPublished - 2009 Feb 1

Keywords

  • Dynamic
  • Electrochemical impedance spectroscopy
  • Polymer electrolyte fuel cell
  • Self-humidification
  • Stabilization

ASJC Scopus subject areas

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

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