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Solvent effect on the Nafion agglomerate morphology in the catalyst layer of the proton exchange membrane fuel cells

Title
Solvent effect on the Nafion agglomerate morphology in the catalyst layer of the proton exchange membrane fuel cells
Author
이성철
Keywords
Proton exchange membrane fuel cell; Membrane electrode assembly; Catalyst ink; Nafion mobility
Issue Date
2017-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 42, no. 1, page. 478-485
Abstract
In this work, we investigated the influence of the solvents used in the catalyst ink on performance of the proton exchange membrane fuel cells (PEMFCs). The mobility of the polymeric chains in 2.5 wt% Nafion dispersion is measured by fluorine-19 nuclear magnetic resonance after the use of different organic solvents including isopropyl alcohol (IPA), dimethyl sulfoxide (DMSO) and N-Methyl-2-pyrrolidone (NMP). Subsequently, the electro-chemical properties, e.g., direct-current polarization and electrochemical impedance spectra, are characterized. As a result, the catalyst layer fabricated from the solvents with high main-chain mobility created more intimate contact at triple-phase boundary, enlarging the electrochemically available surface area and reducing the charge-transfer resistance, mainly due to a strong interaction between solvent molecule and Nafion ionomer. It is demonstrated that the use of the membrane electrode assemblies (MEAs) fabricated from NMP- and DMSO-based catalyst inks enable a H-2/O-2 PEMFC to yield 100% and 33% higher power densities at 0.6 V, respectively, as compared to the MEA fabricated from IPA-based catalyst ink. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0360319916335571?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/112270
ISSN
0360-3199; 1879-3487
DOI
10.1016/j.ijhydene.2016.12.015
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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