Effects of compression distribution on PEMFC stacks using reformate as fuel

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

A PEM fuel cell stack is usually integrated with a reformer into a stationary fuel cell power system. Reformate may cause a phenomenon of voltage vibration in some cells of a stack, and these cells are usually close to end plates. In this work, we studied the instability phenomenon within a 10-cell stack. The instability was observed by monitoring the voltage variation of each cell at high currents. From the test of the assembly pressure distribution, it was found that the pressure distribution of cells close to the end plates was more uneven than others. The scanning electron microscopy (SEM) was used to observe the microstructure of gas diffusion layers within these cells. These scanning electron microscopy images showed that the gas diffusion layers close to end plates suffered more fibers damage, i.e. disabling the hydrophobic structure. The contact angle test results supported this concept as well. In this study, we interpreted that the instability was caused by flooding. If a stack clamping apparatus, providing uniform compression, was used to clamp the stack during testing, the performance of each cell remained stable even in harsh operational conditions. In this paper, it is considered that the pressure distribution of gas diffusion layers is intensely related with water removal ability as reformate is fuel for a proton exchange membrane fuel cell stack.

Original languageEnglish
Pages234-243
Number of pages10
DOIs
Publication statusPublished - 2012 Jan 1
Event19th World Hydrogen Energy Conference, WHEC 2012 - Toronto, ON, Canada
Duration: 2012 Jun 32012 Jun 7

Other

Other19th World Hydrogen Energy Conference, WHEC 2012
CountryCanada
CityToronto, ON
Period12-06-0312-06-07

Fingerprint

Diffusion in gases
Proton exchange membrane fuel cells (PEMFC)
Pressure distribution
Compaction
Fuel cells
Scanning electron microscopy
Clamping devices
Electric potential
Contact angle
Microstructure
Fibers
Monitoring
Testing
Water

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment

Cite this

Huang, K. J., Chen, C. Y., Hwang, S. J., & Lai, W. H. (2012). Effects of compression distribution on PEMFC stacks using reformate as fuel. 234-243. Paper presented at 19th World Hydrogen Energy Conference, WHEC 2012, Toronto, ON, Canada. https://doi.org/10.1016/j.egypro.2012.09.029
Huang, Kuan Jen ; Chen, Chen Yu ; Hwang, Sheng Jye ; Lai, Wei Hsiang. / Effects of compression distribution on PEMFC stacks using reformate as fuel. Paper presented at 19th World Hydrogen Energy Conference, WHEC 2012, Toronto, ON, Canada.10 p.
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Huang, KJ, Chen, CY, Hwang, SJ & Lai, WH 2012, 'Effects of compression distribution on PEMFC stacks using reformate as fuel', Paper presented at 19th World Hydrogen Energy Conference, WHEC 2012, Toronto, ON, Canada, 12-06-03 - 12-06-07 pp. 234-243. https://doi.org/10.1016/j.egypro.2012.09.029

Effects of compression distribution on PEMFC stacks using reformate as fuel. / Huang, Kuan Jen; Chen, Chen Yu; Hwang, Sheng Jye; Lai, Wei Hsiang.

2012. 234-243 Paper presented at 19th World Hydrogen Energy Conference, WHEC 2012, Toronto, ON, Canada.

Research output: Contribution to conferencePaper

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N2 - A PEM fuel cell stack is usually integrated with a reformer into a stationary fuel cell power system. Reformate may cause a phenomenon of voltage vibration in some cells of a stack, and these cells are usually close to end plates. In this work, we studied the instability phenomenon within a 10-cell stack. The instability was observed by monitoring the voltage variation of each cell at high currents. From the test of the assembly pressure distribution, it was found that the pressure distribution of cells close to the end plates was more uneven than others. The scanning electron microscopy (SEM) was used to observe the microstructure of gas diffusion layers within these cells. These scanning electron microscopy images showed that the gas diffusion layers close to end plates suffered more fibers damage, i.e. disabling the hydrophobic structure. The contact angle test results supported this concept as well. In this study, we interpreted that the instability was caused by flooding. If a stack clamping apparatus, providing uniform compression, was used to clamp the stack during testing, the performance of each cell remained stable even in harsh operational conditions. In this paper, it is considered that the pressure distribution of gas diffusion layers is intensely related with water removal ability as reformate is fuel for a proton exchange membrane fuel cell stack.

AB - A PEM fuel cell stack is usually integrated with a reformer into a stationary fuel cell power system. Reformate may cause a phenomenon of voltage vibration in some cells of a stack, and these cells are usually close to end plates. In this work, we studied the instability phenomenon within a 10-cell stack. The instability was observed by monitoring the voltage variation of each cell at high currents. From the test of the assembly pressure distribution, it was found that the pressure distribution of cells close to the end plates was more uneven than others. The scanning electron microscopy (SEM) was used to observe the microstructure of gas diffusion layers within these cells. These scanning electron microscopy images showed that the gas diffusion layers close to end plates suffered more fibers damage, i.e. disabling the hydrophobic structure. The contact angle test results supported this concept as well. In this study, we interpreted that the instability was caused by flooding. If a stack clamping apparatus, providing uniform compression, was used to clamp the stack during testing, the performance of each cell remained stable even in harsh operational conditions. In this paper, it is considered that the pressure distribution of gas diffusion layers is intensely related with water removal ability as reformate is fuel for a proton exchange membrane fuel cell stack.

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Huang KJ, Chen CY, Hwang SJ, Lai WH. Effects of compression distribution on PEMFC stacks using reformate as fuel. 2012. Paper presented at 19th World Hydrogen Energy Conference, WHEC 2012, Toronto, ON, Canada. https://doi.org/10.1016/j.egypro.2012.09.029