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A dual-cell passive direct ethanol fuel cell stack was designed and tested to determine the optimal ethanol feed concentration for performance and ethanol crossover. The optimal concentration was found to be 2 M before long-term testing, but changed to 3 M after long-term testing. The study also found that cell resistance was reduced after long-term testing.

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What they did

System
not_BES

What worked

Voltage1.00Vbest of 6

Abstract

A dual-cell passive direct ethanol fuel cell (DEFC) stack with single ethanol tank was designed and tested to obtain the voltage requirement of electronics and to reduce weight and volume for practical applications. Ethanol crossover and cell performance were determined at different ethanol feed concentrations. Characterization techniques were used, including a cell polarization tests, a long-term steady voltage discharging measurement, and an electrochemical impedance spectroscopy (EIS). It was found that, before long-term steady voltage test, the optimum ethanol feed concentration was 2 M. The ethanol crossover increases with ethanol concentration increment over 2 M and the ethanol crossover exhibited a negative effect on the open circuit voltage (OCV) and the cell performance. However, after a long-term steady voltage test, the best ethanol feed concentration was changed to 3 M. It was due to the difference of current density discharged during long-term operation. It can also be found that, after long-term steady voltage test, the cell resistance was apparently reduced. It may be explained that the mass transport of both liquid fuel and air as a reactant in the cell structure reached equilibrium during long-term operation.

Key findings

  • The ethanol crossover increases with ethanol concentration increment over 2 M.
  • The ethanol crossover has a negative effect on the open circuit voltage (OCV) and cell performance.
  • The cell resistance was apparently reduced after long-term steady voltage test.

Keywords

Open-circuit voltageEthanol fuelEthanolStack (abstract data type)Direct-ethanol fuel cellSteady state (chemistry)

Identifiers

DOI
10.1051/e3sconf/202014101008
Journal
E3S Web of Conferences
Year
2019