A High-Capacity, Reversible Liquid Organic Hydrogen Carrier: H-2-Release Properties and an Application to a Fuel Cell

Authors
Jang, MunjeongJo, Young SukLee, Won JongShin, Byeong SooSohn, HyuntaeJeong, HyangsooJang, Seong CheolKwak, Sang KyuKang, Jeong WonYoon, Chang Won
Issue Date
2019-01
Publisher
American Chemical Society
Citation
ACS Sustainable Chemistry & Engineering, v.7, no.1, pp.1185 - 1194
Abstract
Hydrogen storage in the form of a liquid chemical is an important issue that can bridge the gap between sustainable hydrogen production and utilization with a fuel cell, which is one of the essential sectors in the hydrogen economy. Herein, the application of a potential liquid organic hydrogen carrier, consisting of biphenyl and diphenylmethane, is demonstrated as a safe and economical hydrogen storage material. The presented material is capable of a reversible storage and release of molecular hydrogen with 6.9 wt % and 60 g-H-2 L-1 of gravimetric and volumetric hydrogen storage capacities, respectively, presenting superior properties as a hydrogen carrier. Equilibrium conversion and the required enthalpies of dehydrogenation are calculated using a density functional theory. Experimentally, dehydrogenation conversion of greater than 99% is achieved, producing molecular hydrogen with greater than 99.9% purity, with negligible side reactions; this is further confirmed by nuclear magnetic resonance spectroscopy. Less than 1% of the material is lost after cyclic tests of hydrogenation and dehydrogenation were conducted consecutively nine times. Finally, a dehydrogenation system is designed and operated in conjunction with a polymer electrolyte membrane fuel cell that can generate greater than 0.5 kW of electrical power in a continuous manner, proving its capability as a promising liquid organic hydrogen carrier.
Keywords
CHEMICAL HYDRIDES; STORAGE; DEHYDROGENATION; TRANSPORT; FUTURE; Reversible hydrogen storage; Liquid organic hydrogen carrier; Biphenyl; Diphenylmethane; Catalytic dehydrogenation; Fuel cell
ISSN
2168-0485
URI
https://pubs.kist.re.kr/handle/201004/120555
DOI
10.1021/acssuschemeng.8b04835
Appears in Collections:
KIST Article > 2019
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