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신현석

Shin, Hyeon Suk
Lab for Carbon and 2D Materials
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AA′-Stacked Trilayer Hexagonal Boron Nitride Membrane for Proton Exchange Membrane Fuel Cells

Author(s)
Yoon, Seong InSeo, Dong-JunKim, GwangwooKim, MinsuJung, Chi-YoungYoon, Young-GiJoo, Sang HoonKim, Tae-YoungShin, Hyeon Suk
Issued Date
2018-11
DOI
10.1021/acsnano.8b06268
URI
https://scholarworks.unist.ac.kr/handle/201301/25200
Fulltext
https://pubs.acs.org/doi/10.1021/acsnano.8b06268
Citation
ACS NANO, v.12, no.11, pp.10764 - 10771
Abstract
Hexagonal boron nitride (h-BN) and graphene have emerged as promising materials for proton exchange membranes because of their high proton conductivity and chemical stability. However, the defects and grain boundaries generated during the growth and transfer of two-dimensional materials limit their practical applicability. Here, we report the fabrication of membrane electrode assemblies using large-area single-oriented AA′-stacked trilayer h-BN (3L-BN), which exhibits very few defects during the growth and transfer, as a proton exchange membrane for use in fuel cell systems. The fuel cell based on AA′-stacked 3L-BN showed a H2 permeation current density as low as 2.69 mA cm-2 and an open circuit voltage (OCV) as high as 0.958 V; this performance is much superior to those for cells based on Nafion (3.7 mA cm-2 and 0.942 V, respectively) and single-layer h-BN (10.08 mA cm-2 and 0.894 V, respectively). Furthermore, the fuel cell with the AA′-stacked 3L-BN membrane almost maintained its original performance (OCV, maximum power density, and H2 permeation current density) even after 100 h of an accelerated stress test at 30% RH and 90 °C, while the fuel cells with the Nafion and single-layer BN membranes exhibited severely deteriorated performances. The stability of the cell based on the AA′-stacked 3L-BN membrane was better because the membrane prevented gas crossover and suppressed the generation of reactive radicals during cell operation.
Publisher
AMER CHEMICAL SOC
ISSN
1936-0851
Keyword (Author)
hexagonal boron nitrideAA&apos-stackingproton exchange membrane2D material-based composite membranehigh thermal and chemical stability
Keyword
HYDROGEN ISOTOPESGRAPHENEDEGRADATIONSEPARATIONTRANSPORTNAFION

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