Cost-effective porous-organic-polymer-based electrolyte membranes with superprotonic conductivity and low activation energy

Title
Cost-effective porous-organic-polymer-based electrolyte membranes with superprotonic conductivity and low activation energy
Authors
김진영김종민이경아강동원강민정문민규최종혁김효진김대원홍창섭
Issue Date
2020-01
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 8, NO 3-1153
Abstract
For real-world applications of proton exchange membrane fuel cells (PEMFCs), potential electrolyte materials with high proton conductivity should possess activation energy as low as possible so that good conductivity can be achieved even at low operating temperatures. It is desirable and yet challenging to devise such materials with very low activation energy (<0.1 eV) while maintaining high conductivity. In this work, we have prepared phloroglucinol-based porous organic polymers (POPs) 1S1M, 1S2M, and 1S3Mvia post-synthetic impregnation of sulfuric acid into the pores. The superprotonic conductivity of 1S1M is 2.35 × 10?1 S cm?1 at 70 °C and 90% relative humidity (RH), with a significantly low activation energy of 0.075 eV. The conductivity exceeds that observed for POP-based conductors and is even superior to that of Nafion. Proton-conducting mixed matrix membranes (1S1MP, 1S2MP, and 1S3MP) composed of these powders and poly(vinylidene fluoride) have been fabricated via a drop casting method. 1S3MP exhibits a high proton conductivity of 2.13 × 10?2 S cm?1 at 80 °C and 90% RH. To the best of our knowledge, the activation energy (0.039 eV) of 1S3MP is the lowest recorded value among those for any proton conductive materials. The membrane, which is easy to fabricate and scalable for mass production, is durable over 3 weeks with invariant conductivity.
URI
http://pubs.kist.re.kr/handle/201004/72672
ISSN
2050-7488
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE