Fuel cell performance improvement via the steric effect of a hydrocarbon-based binder for cathode in proton exchange membrane fuel cells
SCIE
SCOPUS
- Title
- Fuel cell performance improvement via the steric effect of a hydrocarbon-based binder for cathode in proton exchange membrane fuel cells
- Authors
- Cha, Jung-Eun; Cho, Won Jae; Hwang, Jeemin; Seo, Dong-Jun; Choi, Young-Woo; Kim, Won Bae
- Date Issued
- 2022-08
- Publisher
- NATURE PORTFOLIO
- Abstract
- In this study, a sulfonated poly(ether sulfone) having cardo-type fluorenyl groups (FL-SPES) was investigated as a cathodic binder to improve fuel cell performance via increased the oxygen diffusion in the cathode. The maximum power density achieved by using the membrane electrode assembly (MEA) prepared with FL-SPES with a low ion exchange capacity (IEC) of 1.31 meq g(-1) was 520 mW cm(-2), which is more than twice as high as that of BP-SPES (210 mW cm(-2)) having typical biphenyl groups with a similar IEC. At high IEC of 1.55 meq g(-1), the power density obtained by using BP-SPES was improved to 454 mW cm(-2) but remained lower than that of FL-SPES. In addition, although the IEC, swelling degree, and specific resistance were similar to each other, the gas permeability of FL-SPES was improved by approximately three times compared to that of BP-SPES. The steric structure of cardo-type FL-SPES increased the free volume between the polymer backbones, leading to an increase in gas transfer. Consequently, oxygen diffusion was promoted at the cathode, resulting in improved fuel cell performance.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/116125
- DOI
- 10.1038/s41598-022-18464-6
- ISSN
- 2045-2322
- Article Type
- Article
- Citation
- SCIENTIFIC REPORTS, vol. 12, no. 1, 2022-08
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- There are no files associated with this item.
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