The effects of air stoichiometry and air excess ratio on the transient response of a PEMFC under load change conditions

Bosung Kim, Dowon Cha, Yong Chan Kim

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)


The transient response of a proton exchange membrane fuel cell (PEMFC) is an important issue for transportation applications. The objective of this study is to investigate the effects of operating and controlling parameters on the transient response of a PEMFC for achieving more stable cell performance under load change conditions. The transient response of a PEMFC was measured and analyzed by varying air stoichiometry, air humidity, and air excess ratio (AER). The optimal air stoichiometry and AER were determined to minimize the voltage drop, undershoot, and voltage fluctuation under the load change, while maintaining high cell performance. Based on the present data, the optimal air stoichiometry was determined to be between 2.0 and 2.5, and the optimal AER was suggested to be between 1.65 and 2.0.

Original languageEnglish
Pages (from-to)143-149
Number of pages7
JournalApplied Energy
Publication statusPublished - 2015 Jan 5

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIP ) (No. 2013068888 ), a Korea University grant, and the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20144010200770).

Publisher Copyright:
© 2014 Elsevier Ltd.


  • Air excess ratio
  • Air stoichiometry
  • Proton exchange membrane fuel cell
  • Self-humidification
  • Transient response

ASJC Scopus subject areas

  • Mechanical Engineering
  • General Energy
  • Management, Monitoring, Policy and Law
  • Building and Construction
  • Renewable Energy, Sustainability and the Environment


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