Carbon-caged palladium catalysts supported on carbon nanofibers for proton exchange membrane fuel cells
- Authors
- Bae, H.E.; Park, Y.D.; Kim, T.-H.; Lim, T.; Kwon, O.J.
- Issue Date
- Nov-2019
- Publisher
- Korean Society of Industrial Engineering Chemistry
- Keywords
- Carbon cage; Cathode; ORR; Pd; PEMFC
- Citation
- Journal of Industrial and Engineering Chemistry, v.79, pp.431 - 436
- Journal Title
- Journal of Industrial and Engineering Chemistry
- Volume
- 79
- Start Page
- 431
- End Page
- 436
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/35199
- DOI
- 10.1016/j.jiec.2019.07.018
- ISSN
- 1226-086X
- Abstract
- The development of low-cost catalysts for the oxygen reduction reaction is an important step for the commercialization of proton-exchange membrane fuel cells. Pd is a robust catalytic material for this reaction and is considered as an alternative to Pt due to its similarity with Pt. However, since Pd is oxidized at a lower positive potential than Pt, it is less active and less stable than Pt in an oxygen reduction reaction. We developed a simple synthesis route for N-doped carbon-caged Pd catalysts supported on carbon nanofibers using Pd-polyaniline composites. Oxidative polymerization of aniline spontaneously produced Pd-polyaniline composites with the reduction of Pd ions. The subsequent heat treatment of Pd-polyaniline composites produced N-doped carbon-caged Pd catalysts, in which the polyaniline served as the source of the N-doped carbon cage. The catalytic activity and stability of the synthesized catalyst were dependent on the heat-treatment temperature and the synthesis method. The optimized catalyst heat-treated at 500 °C (Pd@NC/CNF500 (NDA, US)), which was synthesized with non-distilled aniline under ultrasound irradiation, exhibited higher catalytic activity and stability in oxygen reduction reaction than general Pd catalysts reported in literature. Pd@NC/CNF500 (NDA, US) showed high performance even in the unit cell test. © 2019 The Korean Society of Industrial and Engineering Chemistry
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