A High-Capacity, Reversible Liquid Organic Hydrogen Carrier: H2-Release Properties and an Application to a Fuel Cell

Munjeong Jang, Young Suk Jo, Won Jong Lee, Byeong Soo Shin, Hyuntae Sohn, Hyangsoo Jeong, Seong Cheol Jang, Sang Kyu Kwak, Jeong Won Kang, Chang Won Yoon

Research output: Contribution to journalArticle

4 Citations (Scopus)

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-H2 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.

Original languageEnglish
Pages (from-to)1185-1194
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number1
DOIs
Publication statusPublished - 2019 Jan 7

Keywords

  • Biphenyl
  • Catalytic dehydrogenation
  • Diphenylmethane
  • Fuel cell
  • Liquid organic hydrogen carrier
  • Reversible hydrogen storage

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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