Local water-content measurement of polymer electrolyte membrane for fuel cell applications using: Planar surface coil as a NMR signal detector

Kuniyasu Ogawa, Kohei Ito, Tomoyuki Haishi, Koichi Hishida

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A real-time monitoring method of local water content in polymer electrolyte membrane (PEM) is required to achieve higher current density operation of a polymer electrolyte fuel cell. Based on the Tz relaxation measurement of nuclear magnetic resonance (NMR), the local water-content sensor consisting of the planar surface coil of 0.8 mm outside diameter and a permanent magnet of 1.0 Tesla was developed. In this research, T2(CPMG) relaxation time of PEM was measured by Carr-Purcell-Meiboom-Gill (CPMG) method. The measurement time of CPMG method is 1.1 s. It is found from the result using the solenoidal coil that the T 2 (CPMG) relaxation time of the membrane at 75°C increases with increasing a vapor concentration in N2 gas. The accuracy of T 2 (CPMG) measurement by two small planar coils of 0.8 mm and 2.0 mm outside diameters was evaluated using CuSO4 sulution with the concentrations of 0.1 and 1.2 mmol/1 as standard samples. The average and coefficient of variation of T2 (CPMG) measured by the planar surface coils were evaluated by comparing with the T2(CPMG)STAND measured by the standard solenoidal coil. In the case of 2.0 mm planar coil, the average of T2(CPMG) D-2.0 mm was equal to T 2 (CPMG) STAND within the accuracy of 6%, and the coefficient of variation was in the range of 0.11 to 0.13. In the case of 0.8mm planar coil, the average of T2(CPMG) D-0.8 mm was longer than T2 (CPMG) STAND by the factor of 1.32 to 1.54 due to inhomogeneous perturbing magnetic field exposed from the small planar coil, and the coefficient of variation was in the range of 0.14 to 0.16. Furthermore, T2(CPMG) measurement of PEM by the planar surface coils was performed. Using the planar surface coil and the obtained relationship between T2(CPMG) and water content of PEM, the developed monitoring system can measured local water content in the membrane during 1.1s.

Original languageEnglish
Pages (from-to)1013-1020
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume72
Issue number4
Publication statusPublished - Jul 14 2006

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signal detectors
Water content
moisture content
fuel cells
Fuel cells
coils
Electrolytes
Nuclear magnetic resonance
electrolytes
membranes
Detectors
Membranes
nuclear magnetic resonance
polymers
Polymers
Relaxation time
Monitoring
Time measurement
coefficients
Permanent magnets

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Local water-content measurement of polymer electrolyte membrane for fuel cell applications using: Planar surface coil as a NMR signal detector",
abstract = "A real-time monitoring method of local water content in polymer electrolyte membrane (PEM) is required to achieve higher current density operation of a polymer electrolyte fuel cell. Based on the Tz relaxation measurement of nuclear magnetic resonance (NMR), the local water-content sensor consisting of the planar surface coil of 0.8 mm outside diameter and a permanent magnet of 1.0 Tesla was developed. In this research, T2(CPMG) relaxation time of PEM was measured by Carr-Purcell-Meiboom-Gill (CPMG) method. The measurement time of CPMG method is 1.1 s. It is found from the result using the solenoidal coil that the T 2 (CPMG) relaxation time of the membrane at 75°C increases with increasing a vapor concentration in N2 gas. The accuracy of T 2 (CPMG) measurement by two small planar coils of 0.8 mm and 2.0 mm outside diameters was evaluated using CuSO4 sulution with the concentrations of 0.1 and 1.2 mmol/1 as standard samples. The average and coefficient of variation of T2 (CPMG) measured by the planar surface coils were evaluated by comparing with the T2(CPMG)STAND measured by the standard solenoidal coil. In the case of 2.0 mm planar coil, the average of T2(CPMG) D-2.0 mm was equal to T 2 (CPMG) STAND within the accuracy of 6{\%}, and the coefficient of variation was in the range of 0.11 to 0.13. In the case of 0.8mm planar coil, the average of T2(CPMG) D-0.8 mm was longer than T2 (CPMG) STAND by the factor of 1.32 to 1.54 due to inhomogeneous perturbing magnetic field exposed from the small planar coil, and the coefficient of variation was in the range of 0.14 to 0.16. Furthermore, T2(CPMG) measurement of PEM by the planar surface coils was performed. Using the planar surface coil and the obtained relationship between T2(CPMG) and water content of PEM, the developed monitoring system can measured local water content in the membrane during 1.1s.",
author = "Kuniyasu Ogawa and Kohei Ito and Tomoyuki Haishi and Koichi Hishida",
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T2 - Planar surface coil as a NMR signal detector

AU - Ogawa, Kuniyasu

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AU - Haishi, Tomoyuki

AU - Hishida, Koichi

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N2 - A real-time monitoring method of local water content in polymer electrolyte membrane (PEM) is required to achieve higher current density operation of a polymer electrolyte fuel cell. Based on the Tz relaxation measurement of nuclear magnetic resonance (NMR), the local water-content sensor consisting of the planar surface coil of 0.8 mm outside diameter and a permanent magnet of 1.0 Tesla was developed. In this research, T2(CPMG) relaxation time of PEM was measured by Carr-Purcell-Meiboom-Gill (CPMG) method. The measurement time of CPMG method is 1.1 s. It is found from the result using the solenoidal coil that the T 2 (CPMG) relaxation time of the membrane at 75°C increases with increasing a vapor concentration in N2 gas. The accuracy of T 2 (CPMG) measurement by two small planar coils of 0.8 mm and 2.0 mm outside diameters was evaluated using CuSO4 sulution with the concentrations of 0.1 and 1.2 mmol/1 as standard samples. The average and coefficient of variation of T2 (CPMG) measured by the planar surface coils were evaluated by comparing with the T2(CPMG)STAND measured by the standard solenoidal coil. In the case of 2.0 mm planar coil, the average of T2(CPMG) D-2.0 mm was equal to T 2 (CPMG) STAND within the accuracy of 6%, and the coefficient of variation was in the range of 0.11 to 0.13. In the case of 0.8mm planar coil, the average of T2(CPMG) D-0.8 mm was longer than T2 (CPMG) STAND by the factor of 1.32 to 1.54 due to inhomogeneous perturbing magnetic field exposed from the small planar coil, and the coefficient of variation was in the range of 0.14 to 0.16. Furthermore, T2(CPMG) measurement of PEM by the planar surface coils was performed. Using the planar surface coil and the obtained relationship between T2(CPMG) and water content of PEM, the developed monitoring system can measured local water content in the membrane during 1.1s.

AB - A real-time monitoring method of local water content in polymer electrolyte membrane (PEM) is required to achieve higher current density operation of a polymer electrolyte fuel cell. Based on the Tz relaxation measurement of nuclear magnetic resonance (NMR), the local water-content sensor consisting of the planar surface coil of 0.8 mm outside diameter and a permanent magnet of 1.0 Tesla was developed. In this research, T2(CPMG) relaxation time of PEM was measured by Carr-Purcell-Meiboom-Gill (CPMG) method. The measurement time of CPMG method is 1.1 s. It is found from the result using the solenoidal coil that the T 2 (CPMG) relaxation time of the membrane at 75°C increases with increasing a vapor concentration in N2 gas. The accuracy of T 2 (CPMG) measurement by two small planar coils of 0.8 mm and 2.0 mm outside diameters was evaluated using CuSO4 sulution with the concentrations of 0.1 and 1.2 mmol/1 as standard samples. The average and coefficient of variation of T2 (CPMG) measured by the planar surface coils were evaluated by comparing with the T2(CPMG)STAND measured by the standard solenoidal coil. In the case of 2.0 mm planar coil, the average of T2(CPMG) D-2.0 mm was equal to T 2 (CPMG) STAND within the accuracy of 6%, and the coefficient of variation was in the range of 0.11 to 0.13. In the case of 0.8mm planar coil, the average of T2(CPMG) D-0.8 mm was longer than T2 (CPMG) STAND by the factor of 1.32 to 1.54 due to inhomogeneous perturbing magnetic field exposed from the small planar coil, and the coefficient of variation was in the range of 0.14 to 0.16. Furthermore, T2(CPMG) measurement of PEM by the planar surface coils was performed. Using the planar surface coil and the obtained relationship between T2(CPMG) and water content of PEM, the developed monitoring system can measured local water content in the membrane during 1.1s.

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