期刊
ELECTROCHIMICA ACTA
卷 198, 期 -, 页码 156-164出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.02.209
关键词
Co-electrospinning; Nanofibers; Simultaneous electron and proton conductivity; Fuel Cell Catalyst Support; Electrochemical Impedance Spectroscopy; Equivalent circuits
资金
- National Science Foundation [CBET 1150528, CMMI 1537827]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1150528] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1537827] Funding Source: National Science Foundation
Nanostructured composites of electron and proton conducting materials were fabricated via simultaneous electrospinning of Nafion and PANI solutions on a rotating collector for application as fuel cell catalyst supports. Poly (ethylene oxide) (PEO) was used as a carrier polymer to enhance chain entanglements and therefore the electrospinnability of both solutions. Dual nanofiber mat with a Nafion/PANI composition of 50/50 wt% was prepared. Post electrospinning annealing at 150 degrees C for 5 mins and densification at 500 psi was performed to enhance Nafion domain crystallinity and fiber fraction (i.e. reduce void volume), respectively. PEO was selectively removed by treatment of the electrospun mats in boiling acid solution for one hour. Conductivity of the nanofiber mats was investigated using electrochemical impedance spectroscopy and equivalent circuit was used to decouple impedance from electron and proton transfer in the composite fiber mat. The resultant dual nanofiber mat exhibited an inplane conductivity (sigma(-)) of 0.014 and 0.023 S/cm for electrons and protons, respectively. Through plane conductivity (sigma(perpendicular to)) was also studied and the dual nanofiber mat showed anisotropy for both proton and electron conductivities with (sigma(-))/(sigma(perpendicular to)) = 1.27 and 1.4, respectively. Such dual nanofiber mats with percolating phases of both electron-and proton-conductors and three dimensional through-connected inter-fiber pore structure (for gas transport) can potentially serve as excellent catalyst supports for fuel cells. (C) 2016 Published by Elsevier Ltd.
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