Effects of heat treatment time on electrochemical properties and electrode structure of polytetrafluoroethylene-bonded membrane electrode assemblies for polybenzimidazole-based high-temperature proton exchange membrane fuel cells
- Effects of heat treatment time on electrochemical properties and electrode structure of polytetrafluoroethylene-bonded membrane electrode assemblies for polybenzimidazole-based high-temperature proton exchange membrane fuel cells
- 김민중; 정기수; 엄광섭; 조은애; 류정욱; 김형준; 권혁상
- PEMFC; Ammonia borane; Continuous hydrogen generation; Solvent-mediated thermolysis; Polymer electrolyte membrane fuel cell
- Issue Date
- International journal of hydrogen energy
- VOL 38, NO 28, 12335-12342
- To improve cell performance, the effects of heat treatment time on the electrochemical
properties and electrode structure of PTFE-bonded membrane electrode assemblies for PBIbased high-temperature proton exchange membrane fuel cells are investigated. The cell
performance is observed to decrease in the high-current-density region rather than in the
low-current-density region with increasing heat treatment time at 350 ℃ from 1 to 30 min.
Microscopic studies reveal remarkable differences in the electrode structure by the
agglomeration of dispersed PTFE and adjacent catalyst particles, depending on the heat
treatment time. As the heat treatment time increases, only the large pore (secondary pore)
volume in the electrode decreases, resulting in increase in mass transport resistance and
concentration overpotential in the high-current-density region. Cell performance is not
measured without heat treatment because the electrodes are not formed. When the
electrodes are heat treated for 1 min at 350 ℃, the best cell performance is obtained, 0.67 V
at 200 mA cm-2.
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