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Issue 36, 2013
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Reversible hydrogen desorption from LiBH4 catalyzed by graphene supported Pt nanoparticles

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Abstract

The thermally induced de-/rehydrogenation performance of the graphene supported Pt nanoparticles (Pt/G) doped LiBH4 was greatly improved even at very low catalyst content due to a synergetic effect of Pt addition and nanoconfinement in graphene. For the 5 wt% Pt/G doped LiBH4 sample, the onset hydrogen desorption temperature is about 140 °C lower than that of the pure LiBH4. With increasing loading of the Pt/G catalysts in LiBH4 samples, the onset dehydrogenation temperature and the two main desorption peaks from LiBH4 were found to decrease while the hydrogen release amount increased. About 17.8 wt% can be released from the 50 wt% Pt/G doped LiBH4 sample below 500 °C. Moreover, variation of the equilibrium pressure (350–450 °C) indicates that the dehydrogenation enthalpy is reduced from 74 kJ mol−1 H2 for the pure LiBH4 to ca. 48 kJ mol−1 H2 for the 10 wt% Pt/G doped LiBH4, showing improved thermodynamic properties. More importantly, a reversible capacity of ca. 8.1 wt% in the 30th de-/rehydrogenation cycle was achieved under 3 MPa H2 at 400 °C for 10 h, indicating that the Pt/G catalysts play a crucial role in the improvement of the hydrogen uptake reversibility of LiBH4 at lower temperature and pressure conditions. Especially, LiBH4 was reformed and a new product, Li2B10H10, was detected after the rehydrogenation process.

Graphical abstract: Reversible hydrogen desorption from LiBH4 catalyzed by graphene supported Pt nanoparticles

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Publication details

The article was received on 09 Apr 2013, accepted on 02 May 2013 and first published on 02 May 2013


Article type: Paper
DOI: 10.1039/C3DT50933H
Dalton Trans., 2013,42, 12926-12933

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    Reversible hydrogen desorption from LiBH4 catalyzed by graphene supported Pt nanoparticles

    J. Xu, Z. Qi, J. Cao, R. Meng, X. Gu, W. Wang and Z. Chen, Dalton Trans., 2013, 42, 12926
    DOI: 10.1039/C3DT50933H

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