Pem fuel cell electrodes: Nanofiber-based hybrid and CeO2 included electrodes for boosted performance

Iskandarani, Bilal (2022) Pem fuel cell electrodes: Nanofiber-based hybrid and CeO2 included electrodes for boosted performance. [Thesis]

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PEM fuel cells have become increasingly drawn attention in numerous applications during the past decade. However, PEM fuel cells suffer from a number of drawbacks such as;the high Pt and Nafion® utilization within the electrodes exhibits a significant financial burden. Furthermore, the catalyst layer undergoes a number of side-processes during operation resulting in its deterioration and loss in performance with time. To address those issues, fiber-based electrodes were fabricated using electrospinning utilizing Pt/C as a catalyst, sulfonated silica as a proton conducting ionomer, and poly (vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) as a carrier polymer. The fabricated electrodes demonstrated a functional and Nafion®-free cost-effective alternative to classically sprayed electrodes. They exhibited superior performance recording up to 417.7 maximum power density exceeding that of sprayed electrodes and fiber-based electrodes employing Nafion®. Furthermore, the aforementioned electrodes showed impressive durability against Pt-dissolution retaining up to 86.5% and exhibited a 2.6% gain in performance under C-corrosion AST. In the second part of the dissertation, CeO2-based additives were investigated to enhance the oxygen reduction reaction kinetics. Nanorod CeO2/NrGO, bare nanorod CeO2, nanocube, and nano octahedral CeO2 exhibited an overall increase in the ORR activity with octahedral CeO2 recording the highest power output (483.4 Furthermore, cerium oxide nanocube additive-based electrodes exhibited an impressive durability retaining up to 80.3% of its initial maximum power density.
Item Type: Thesis
Uncontrolled Keywords: PEM fuel cells. -- electrodes. -- fibers. -- sulfonated silica. -- cerium oxide. -- PEM yakıt hücreleri. -- elektrotlar. -- lifler. -- sülfonlanmış silika. -- seryum oksit.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Dila Günay
Date Deposited: 12 Jul 2023 14:09
Last Modified: 12 Jul 2023 14:09

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