Performance degradation analysis of DMFC by freeze/thaw cycles

Yumi Oh, Sang Kyung Kim, Seongyop Lim, Dong Hyun Peck, Doohwan Jung, Yong-Gun Shul

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

At sub-zero temperature, the startup capability and performance of DMFC is poor. Performance degradation of direct methanol fuel cell (DMFC) was investigated by freeze/thaw cycle. Maximum power density of DMFC decreased as the cycle number increased by 71% after 35 cycles of -20°C and 60°C and by 62% after 12 cycles of -32°C and 60°C. However, the cells purged by nitrogen gas before freeze stage were found to have less performance loss than the cell which was not purged. Electrical resistance increase of the cells with gas purge was also less. These results showed that it is necessary to remove the water in DMFCs to maintain stable performance under sub-zero temperature and gas purging is proved to be effective for storage under subzero temperature.

Original languageEnglish
Title of host publicationEFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition
PublisherENEA
Pages203-204
Number of pages2
ISBN (Electronic)9788882862541
Publication statusPublished - 2011 Jan 1
Event4th European Fuel Cell Piero Lunghi Conference and Exhibition, EFC 2011 - Rome, Italy
Duration: 2011 Dec 142011 Dec 16

Other

Other4th European Fuel Cell Piero Lunghi Conference and Exhibition, EFC 2011
CountryItaly
CityRome
Period11/12/1411/12/16

Fingerprint

Direct methanol fuel cells (DMFC)
Degradation
Gases
Purging
Acoustic impedance
Temperature
Nitrogen
Water

All Science Journal Classification (ASJC) codes

  • Fuel Technology

Cite this

Oh, Y., Kim, S. K., Lim, S., Peck, D. H., Jung, D., & Shul, Y-G. (2011). Performance degradation analysis of DMFC by freeze/thaw cycles. In EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition (pp. 203-204). ENEA.
Oh, Yumi ; Kim, Sang Kyung ; Lim, Seongyop ; Peck, Dong Hyun ; Jung, Doohwan ; Shul, Yong-Gun. / Performance degradation analysis of DMFC by freeze/thaw cycles. EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition. ENEA, 2011. pp. 203-204
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title = "Performance degradation analysis of DMFC by freeze/thaw cycles",
abstract = "At sub-zero temperature, the startup capability and performance of DMFC is poor. Performance degradation of direct methanol fuel cell (DMFC) was investigated by freeze/thaw cycle. Maximum power density of DMFC decreased as the cycle number increased by 71{\%} after 35 cycles of -20°C and 60°C and by 62{\%} after 12 cycles of -32°C and 60°C. However, the cells purged by nitrogen gas before freeze stage were found to have less performance loss than the cell which was not purged. Electrical resistance increase of the cells with gas purge was also less. These results showed that it is necessary to remove the water in DMFCs to maintain stable performance under sub-zero temperature and gas purging is proved to be effective for storage under subzero temperature.",
author = "Yumi Oh and Kim, {Sang Kyung} and Seongyop Lim and Peck, {Dong Hyun} and Doohwan Jung and Yong-Gun Shul",
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Oh, Y, Kim, SK, Lim, S, Peck, DH, Jung, D & Shul, Y-G 2011, Performance degradation analysis of DMFC by freeze/thaw cycles. in EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition. ENEA, pp. 203-204, 4th European Fuel Cell Piero Lunghi Conference and Exhibition, EFC 2011, Rome, Italy, 11/12/14.

Performance degradation analysis of DMFC by freeze/thaw cycles. / Oh, Yumi; Kim, Sang Kyung; Lim, Seongyop; Peck, Dong Hyun; Jung, Doohwan; Shul, Yong-Gun.

EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition. ENEA, 2011. p. 203-204.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - At sub-zero temperature, the startup capability and performance of DMFC is poor. Performance degradation of direct methanol fuel cell (DMFC) was investigated by freeze/thaw cycle. Maximum power density of DMFC decreased as the cycle number increased by 71% after 35 cycles of -20°C and 60°C and by 62% after 12 cycles of -32°C and 60°C. However, the cells purged by nitrogen gas before freeze stage were found to have less performance loss than the cell which was not purged. Electrical resistance increase of the cells with gas purge was also less. These results showed that it is necessary to remove the water in DMFCs to maintain stable performance under sub-zero temperature and gas purging is proved to be effective for storage under subzero temperature.

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Oh Y, Kim SK, Lim S, Peck DH, Jung D, Shul Y-G. Performance degradation analysis of DMFC by freeze/thaw cycles. In EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition. ENEA. 2011. p. 203-204