Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 1, Pages 1185-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04835
Keywords
Reversible hydrogen storage; Liquid organic hydrogen carrier; Biphenyl; Diphenylmethane; Catalytic dehydrogenation; Fuel cell
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Funding
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT, and Future Planning [2015M1A2A2074688]
- New AMP
- Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry AMP
- Energy, Republic of Korea [20153030041030]
- KIST institutional program - Korea Institute of Science and Technology [2E28272]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20153030041030] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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