Numerical analysis of a high-temperature proton exchange membrane fuel cell under humidified operation with stepwise reactant supply

Hyung Soon Kim, Seung Won Jeon, Dowon Cha, Yong Chan Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Dynamic response is a very important issue in a vehicle powered by a proton exchange membrane fuel cell (PEMFC) due to its frequent load change. In this study, three-dimensional transient simulation was conducted to investigate the dynamic response of a high temperature PEMFC. A stepwise change in the cell voltage was conducted to simulate the sudden load change during vehicle operation. After the load change, the oxygen concentration, ionic conductivity, and local current density were analyzed, and the water transport through the membrane electrode assembly (MEA) was also evaluated to determine the characteristics of overshoot and settling time. The result showed that the overshoot was mainly due to the pre-existing excessive oxygen. At the humidified condition, the overshoot increased with increasing relative humidity due to higher ionic conductivity and electrochemical reaction rate. In addition, a stepwise mass flow control strategy for the reactants decreased the overshoot and settling time by decreasing the amount of oversupplied oxygen immediately after the load change. The settling time for the stepwise mass flow control was approximately 30% lower than that for the constant mass flow rate control.

Original languageEnglish
Pages (from-to)13657-13665
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number31
DOIs
Publication statusPublished - 2016 Aug 17

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
fuel cells
numerical analysis
Numerical analysis
settling
Ionic conductivity
membranes
Flow control
Oxygen
Dynamic response
protons
mass flow
dynamic response
ion currents
vehicles
oxygen
Temperature
Reaction rates
mass flow rate
Atmospheric humidity

Keywords

  • Dynamic response
  • High temperature
  • PEMFC
  • Relative humidity

ASJC Scopus subject areas

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

Cite this

Numerical analysis of a high-temperature proton exchange membrane fuel cell under humidified operation with stepwise reactant supply. / Kim, Hyung Soon; Jeon, Seung Won; Cha, Dowon; Kim, Yong Chan.

In: International Journal of Hydrogen Energy, Vol. 41, No. 31, 17.08.2016, p. 13657-13665.

Research output: Contribution to journalArticle

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