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Effective thermal conductivity of MgH<sub>2</sub> compacts containing expanded natural graphite under a hydrogen atmosphere

Author:
Jae-Hyeok Shim  Mirae Park  Young Hyo Lee  Sanggon Kim  Yeon Ho Im  Jin-Yoo Suh  Young Whan Cho  


Journal:
International Journal of Hydrogen Energy


Issue Date:
2014


Abstract(summary):

Abstract Expanded natural graphite (ENG) was added to enhance the effective thermal conductivity of MgH 2 , which is one of the important parameters in the design of MgH 2 -based hydrogen storage tanks. Cylindrical MgH 2 compacts containing up to 20 wt% ENG flakes with various average sizes (20, 50, 200, 350 and 1200 μm) were fabricated to measure the effective thermal conductivity of MgH 2 –ENG mixtures. The radial direction effective thermal conductivity of the compacts was measured under a hydrogen atmosphere up to 70 bar. The conductivity was significantly enhanced by the addition of ENG flakes, reaching 9.3 W m −1  K −1 at 20 wt% ENG at 1 bar of hydrogen. It was observed that hydrogen pressure and the size of ENG flakes influenced the conductivity together with the amount of ENG. As hydrogen pressure increased up to 20 bar, the conductivity continued to increase. On the other hand, the conductivity very slowly increased above 20 bar, exhibiting a saturation tendency. It relatively rapidly increased with increasing average flake size up to 200 μm and then gradually decreased with further increasing size up to 1200 μm, exhibiting the maximum value at an average flake size of 200 μm. This trend might be determined by the competition between the thermal resistance at ENG/MgH 2 interfaces and the formation of conductive networks of ENG flakes. Highlights • The thermal conductivity of MgH 2 –graphite compacts is measured under H 2 pressure. • H 2 pressure up to 20 bar increases the thermal conductivity. • The thermal conductivity reaches the maximum at a graphite flake size of 200 μm.


Page:
349-349


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