Abstract
The aim of the project has been to further develop components for an all Danish high temperature PEM fuel cells stack for application in combined heat and power units (CHP units). The final product aimed at was a 1.5-2 kW stack for operation at 150-200 deg. C. The project follows the previous PSO project 4760, 'High Temperature PEM Fuel Cell'. The project has addressed the HT-PEM fuel cells form a components point of view and the materials here for. The main areas were polymer and membrane development, electrode and MEA development (MEA = membrane electrode assembly, i.e. the cells.) and stack development. The membrane development begins with the polymer. The polymerization technique was improved significantly in two ways. Better understanding of the process and the critical issues has led to more reproducible results with repeated high molecular weights. The molecular weight is decisive for the membrane strength and durability. The process was also scaled up to 100-200 g polymer pr. batch in a new polymerization facility build during the project. It is dimensioned for larger batches too, but this was not verified during the project. The polymer cannot be purchased in the right quality for fuel cell membranes and it
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Jensen, Jens Oluf;
Li, Q;
[1]
Terkelsen, C;
Rudbech, H C;
Steenberg, T;
[2]
Rycke, Thibault de
[3]
- Technical Univ. of Denmark, Dept. of Chemistry, Kgs. Lyngby (Denmark)
- Danish Power System Aps, Charlottenlund (Denmark)
- IRD Fuel Cell A/S, Svendborg (Denmark)
Citation Formats
Jensen, Jens Oluf, Li, Q, Terkelsen, C, Rudbech, H C, Steenberg, T, and Rycke, Thibault de.
Development of HT-PEMFC components and stack for CHP unit.
Denmark: N. p.,
2009.
Web.
Jensen, Jens Oluf, Li, Q, Terkelsen, C, Rudbech, H C, Steenberg, T, & Rycke, Thibault de.
Development of HT-PEMFC components and stack for CHP unit.
Denmark.
Jensen, Jens Oluf, Li, Q, Terkelsen, C, Rudbech, H C, Steenberg, T, and Rycke, Thibault de.
2009.
"Development of HT-PEMFC components and stack for CHP unit."
Denmark.
@misc{etde_1000224,
title = {Development of HT-PEMFC components and stack for CHP unit}
author = {Jensen, Jens Oluf, Li, Q, Terkelsen, C, Rudbech, H C, Steenberg, T, and Rycke, Thibault de}
abstractNote = {The aim of the project has been to further develop components for an all Danish high temperature PEM fuel cells stack for application in combined heat and power units (CHP units). The final product aimed at was a 1.5-2 kW stack for operation at 150-200 deg. C. The project follows the previous PSO project 4760, 'High Temperature PEM Fuel Cell'. The project has addressed the HT-PEM fuel cells form a components point of view and the materials here for. The main areas were polymer and membrane development, electrode and MEA development (MEA = membrane electrode assembly, i.e. the cells.) and stack development. The membrane development begins with the polymer. The polymerization technique was improved significantly in two ways. Better understanding of the process and the critical issues has led to more reproducible results with repeated high molecular weights. The molecular weight is decisive for the membrane strength and durability. The process was also scaled up to 100-200 g polymer pr. batch in a new polymerization facility build during the project. It is dimensioned for larger batches too, but this was not verified during the project. The polymer cannot be purchased in the right quality for fuel cell membranes and it is important that it manufacture is not a limiting factor at the present state. Experiments with other membrane casting techniques were also made. The traditional PBI doped with phosphoric acid is still the state of art membrane for the HT-PEM fuel cells, but progress was also made with modified membranes. Different variants of PBI were synthesized and tested. Electrodes have been manufactured by a spray technique in contrast to the previously applied tape casting. The hand held spray gun previously led to an improvement of the electrodes, but the reproducibility was limited. Subsequently the construction of a semi automated spray machine was started and results like of the best hand sprayed electrodes were obtained. A viable way of MEA rim enforcement was initiated in the project. The reason for this was to create a better surface to seal against and to prevent membrane rupture during service. A special MEA pressing tool was developed for easy alignment and control of the compression. Fuel cells stacks of the developed MEA's were constructed and tested. The aim was to construct a liquid cooled stack based on IRD's experiences. A 40 cell liquid cooled stack was made by IRD at the end of the project. The cell area was 7x17 cm. A perfluoropolyether was chosen as coolant doe to its low viscosity at all relevant temperatures combined with a low volatility. Besides an air cooled stack was built at DTU with a different materials approach which is confidential. A part of the detailed results regarding stacking was reported in a confidential annex to the main report. (LN)}
place = {Denmark}
year = {2009}
month = {Oct}
}
title = {Development of HT-PEMFC components and stack for CHP unit}
author = {Jensen, Jens Oluf, Li, Q, Terkelsen, C, Rudbech, H C, Steenberg, T, and Rycke, Thibault de}
abstractNote = {The aim of the project has been to further develop components for an all Danish high temperature PEM fuel cells stack for application in combined heat and power units (CHP units). The final product aimed at was a 1.5-2 kW stack for operation at 150-200 deg. C. The project follows the previous PSO project 4760, 'High Temperature PEM Fuel Cell'. The project has addressed the HT-PEM fuel cells form a components point of view and the materials here for. The main areas were polymer and membrane development, electrode and MEA development (MEA = membrane electrode assembly, i.e. the cells.) and stack development. The membrane development begins with the polymer. The polymerization technique was improved significantly in two ways. Better understanding of the process and the critical issues has led to more reproducible results with repeated high molecular weights. The molecular weight is decisive for the membrane strength and durability. The process was also scaled up to 100-200 g polymer pr. batch in a new polymerization facility build during the project. It is dimensioned for larger batches too, but this was not verified during the project. The polymer cannot be purchased in the right quality for fuel cell membranes and it is important that it manufacture is not a limiting factor at the present state. Experiments with other membrane casting techniques were also made. The traditional PBI doped with phosphoric acid is still the state of art membrane for the HT-PEM fuel cells, but progress was also made with modified membranes. Different variants of PBI were synthesized and tested. Electrodes have been manufactured by a spray technique in contrast to the previously applied tape casting. The hand held spray gun previously led to an improvement of the electrodes, but the reproducibility was limited. Subsequently the construction of a semi automated spray machine was started and results like of the best hand sprayed electrodes were obtained. A viable way of MEA rim enforcement was initiated in the project. The reason for this was to create a better surface to seal against and to prevent membrane rupture during service. A special MEA pressing tool was developed for easy alignment and control of the compression. Fuel cells stacks of the developed MEA's were constructed and tested. The aim was to construct a liquid cooled stack based on IRD's experiences. A 40 cell liquid cooled stack was made by IRD at the end of the project. The cell area was 7x17 cm. A perfluoropolyether was chosen as coolant doe to its low viscosity at all relevant temperatures combined with a low volatility. Besides an air cooled stack was built at DTU with a different materials approach which is confidential. A part of the detailed results regarding stacking was reported in a confidential annex to the main report. (LN)}
place = {Denmark}
year = {2009}
month = {Oct}
}