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Influence of the Nafion agglomerate morphology on the water-uptake behavior and fuel cell performance in the proton exchange membrane fuel cells

Title
Influence of the Nafion agglomerate morphology on the water-uptake behavior and fuel cell performance in the proton exchange membrane fuel cells
Author
이성철
Keywords
Proton exchange membrane fuel cell; Water uptake; Catalyst layer; Solvent effect; Nafion mobility
Issue Date
2019-03
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED SURFACE SCIENCE, v. 481, Page. 777-784
Abstract
In the preparation of catalyst ink for proton exchange membrane fuel cell, the dispersing solvent has significant influence on the physicochemical and electrochemical properties of catalyst layer (CL), primarily due to the variation of the Nafion ionomer mobility. In this work, based on the Nafion mobility, the effect of solvent on water uptake (WU) behavior in the CL was investigated with respect to different solvents. To vary main- and side-chain mobilities of the Nafion ionomers, we consider different solvents such as glycerol, propylene glycol (PG), isopropyl alcohol (IPA), and N-methyl-2-pyrrolidinone (NMP). Experimental results demonstrated that the NMP CL showed the highest WU at 90% relative humidity, presenting 1.23, 1.27, and 1.28 times higher than that of the glycerol, PG, and IPA CL, respectively. Furthermore, the microstructure and phase images of the CLs revealed that the main-chain mobility governs the clustering behaviors among the Nafion agglomerates, whereas the side-chain mobility determines the ion-clustering behavior within the Nafion agglomerate. From the electrochemical performances, it was observed that the main- and side-chain mobility are related to the electrochemically active area and the proton-conduction pathway, respectively.
URI
https://www.sciencedirect.com/science/article/pii/S0169433219307330?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/107212
ISSN
0169-4332; 1873-5584
DOI
10.1016/j.apsusc.2019.03.113
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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