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Porous electrospun carbon nanofibers network as an integrated electrode@gas diffusion layer for high temperature polymer electrolyte membrane fuel cells

Title data

Delikaya, Öznur ; Bevilacqua, Nico ; Eifert, László ; Kunz, Ulrike ; Zeis, Roswitha ; Roth, Christina:
Porous electrospun carbon nanofibers network as an integrated electrode@gas diffusion layer for high temperature polymer electrolyte membrane fuel cells.
In: Electrochimica Acta. Vol. 345 (2020) . - Art.Nr. 136192.
ISSN 0013-4686
DOI: https://doi.org/10.1016/j.electacta.2020.136192

Abstract in another language

High temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) utilize phosphoric acid imbibed polybenzimide membranes, which allow for improved reaction kinetics due to the higher operating temperatures, but suffer from the corrosive environment and the sluggish oxygen transport and associated transport limitations. The latter issue is addressed in this work by the integration of the gas diffusion layer (GDL) into the gas diffusion electrode (GDE) in an entirely electrospun concept. For this purpose, coaxial electrospinning is applied by spinning two immiscible polymer solutions simultaneously to create a core-shell structure. Porous carbon felt structures are obtained due to phase separation in the shell and a subsequent carbonization treatment (integrated GDE@GDL). Full cell tests (0.6 mgPt cm−2) demonstrate a 21% increase in the power density normalized to the platinum content compared to the spray-coated reference (1 mgPt cm−2). Electrochemical impedance spectroscopy (EIS) measurements coupled with the distribution of relaxation times (DRT) analysis show that the morphology of the GDE@GDL favors oxygen transport inside the electrode. Mass transport limitations were successfully remedied by our electrospun concept rendering an additional GDL sheet obsolete.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr. Christina Roth
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 22 Apr 2021 07:18
Last Modified: 22 Apr 2021 07:18
URI: https://eref.uni-bayreuth.de/id/eprint/64864