High temperature polymer electrolyte membrane fuel cells with Polybenzimidazole-Ce0.9Gd0.1P2O7 and polybenzimidazole-Ce0.9Gd0.1P2O7-graphite oxide composite electrolytes

Title
High temperature polymer electrolyte membrane fuel cells with Polybenzimidazole-Ce0.9Gd0.1P2O7 and polybenzimidazole-Ce0.9Gd0.1P2O7-graphite oxide composite electrolytes
Authors
헨켄스마이어디억남비 크리쉬난아나스타시아Bhupendra SinghNitika DeviAvanish Kumar SrivastavaRajesh K. SinghSun-Ju Song
Keywords
Organic-inorganic composite membranes; Phosphoric acid doped polybenzimidazole; Gadolinium doped cerium pyrophosphate; Graphite oxide; High-temperature polymer electrolyte membrane fuel
Issue Date
2018-10
Publisher
Journal of power sources
Citation
VOL 401-157
Abstract
In this work, polybenzimidazole based composite membranes are fabricated using polybenzimidazole, Ce0.9Gd0.1P2O7 and graphite oxide by solution casting procedure. The microstructural, mechanical and electrical properties of the phosphoric acid-doped composite membranes are characterized for fuel cell applications. Addition of graphite oxide in the composite leads to improvement in homogeneous dispersion of higher amount, 31  wt%, of Ce0.9Gd0.1P2O7. With the increasing amount of Ce0.9Gd0.1P2O7 in the composite membranes the amount of phosphoric acid loading decreases, but the proton conductivity of the composite membrane is higher than that is reported for the phosphoric acid-doped polybenzimidazole membranes. At 180  °C, a maximum conductivity of 182  mS  cm− 1 for polybenzimidazole/Ce0.9Gd0.1P2O7 membrane with 24  wt% Ce0.9Gd0.1P2O7 and 199  1 for polybenzimidazole/Ce0.9Gd0.1P2O7/graphite oxide membrane with 31  wt% Ce0.9Gd0.1P2O7 is observed. The H2-Air fuel cells operating at 160  °C with ∼250  μm thick polybenzimidazole/Ce0.9Gd0.1P2O7 electrolyte shows open circuit voltage of 0.938  V and maximum power density of 255  mW  2 with 640  mA  2 current at 160  °C whereas the corresponding values with ∼200  μm thick polybenzimidazole/Ce0.9Gd0.1P2O7/graphite oxide membrane are 0.976  V and 307  2 with 800  2 current, respectively. However, irrespective of the increased conductivity at the higher temperatures, the maximum power density decreases with increasing temperature >160  °C.
URI
http://pubs.kist.re.kr/handle/201004/68078
ISSN
0378-7753
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KIST Publication > Article
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