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Multifunctional Nafion/CeO~2~ Dendritic Structures for Enhanced Durability and Performance of Polymer Electrolyte Membrane Fuel Cells by Jiwoo Choi; Je Hyeon Yeon; Seung Ho Yook; Sungsoo Shin; Jin Young Kim; Mansoo Choi; Segeun Jang is a Engineering article available to read on EtoBox.

What is Multifunctional Nafion/CeO~2~ Dendritic Structures for Enhanced Durability and Performance of Polymer Electrolyte Membrane Fuel Cells about?

The development of a novel approach to achieve high-performance and durable fuel cells is imperative for the further commercialization of proton-exchange (or polymer electrolyte) membrane fuel cells (PEMFCs). In this work, multifunctional dendritic Nafion/CeO 2 structures were introduced onto the cathode side of the interface between a membrane and a catalyst layer through electrospray deposition. The dendritic structures enlarged the interfacial contact area between the membrane and the catalyst layer and formed microscale voids between the catalyst layer and gas diffusion medium. This improved the PEMFC performance through the effective utilization of the catalyst and enhanced mass transport of the reactant. Especially, under lowhumidity conditions, the hygroscopic effect of CeO 2 nanoparticles also boosted the power density of PEMFCs. In addition to the beneficial effects on the efficiency of the PEMFC, the incorporation of CeO 2 , widely known as a radical scavenger, effectively mitigated the free-radical attack on the outer surface of the membrane, where chemical degradation is initiated by radicals formed during PEMFC operation. These multifunctional effects of the dendritic

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Author

Jiwoo Choi; Je Hyeon Yeon; Seung Ho Yook; Sungsoo Shin; Jin Young Kim; Mansoo Choi; Segeun Jang

Publisher

American Chemical Society (ACS)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)