Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 4, Pages 1769-1775Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.09.095
Keywords
Enzyme fuel cell; Neutron imaging; Laccase; Three-dimensional cathode; Water management
Funding
- American Chemical Society - Green Chemistry Initiative at Georgia Institute of Technology
- U S Department of Energy [DE-AC05-00OR22725]
- U S Department of Commerce
- NIST Ionizing Radiation Division
- NIST Center for Neutron Research
- Laboratory Directed Research and Development Program of ORNL
- Director s office of NIST
- Department of Energy [DE-AI01-01EE50660]
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Neutron imaging was used to study cathode water content over time in a three dimensional-cathode enzyme fuel cell (EFC) A porous carbon felt cathode allowed air to flow through the electrode A solution with laccase and a mediator formed an aqueous layer on the electrode surface Water loss was observed in situ via neutron imaging for varying experimental conditions including flow rates of hydrogen and air cathode inlet humidity volume of enzyme solution and its composition Cathode water loss occurred for all experimental conditions but the loss rate was noticeably reduced when a high-salt-concentration enzyme solution was used in the cathode in conjunction with increased humidity in the air feed stream Results from neutron imaging and power density analysis wire used in analyzing the causes that could contribute to EFC water loss An increase in temperature due to the exothermic cathode reaction is considered a plausible cause of cathode water loss via evaporation This is the first reported application of neutron imaging as a technique to study EFC water management The results suggest that neutron imaging can be employed to provide a better understanding of EFC phenomena and thereby contribute to design and operational improvements of EFCs (C) 2010 Elsevier B V All rights reserved
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