Synthesis of three-dimensional hierarchically porous reduced graphene oxide–TiO2 nanocomposite for enhanced hydrogen storage

Three-dimensional hierarchically porous graphene-TiO2 (3D-HPGT) nanocomposites were synthesized through electrostatic assembly method. The obtained 3D-HPGT nanocomposites exhibited hierarchically porous structure with multi-level pores (macro-, meso- and micropores), high specific surface area (705 ...

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Bibliographic Details
Published in:Ceramics international 2018-08, Vol.44 (11), p.12458-12465
Main Authors: Liu, Yurong, Zhang, Zongqiang, Hu, Rong
Format: Article
Language:English
Subjects:
Graphene-TiO2 nanocomposites
Hierarchically porous structure
Hydrogen spillover effect
Hydrogen storage
Three-dimensional
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Summary:Three-dimensional hierarchically porous graphene-TiO2 (3D-HPGT) nanocomposites were synthesized through electrostatic assembly method. The obtained 3D-HPGT nanocomposites exhibited hierarchically porous structure with multi-level pores (macro-, meso- and micropores), high specific surface area (705 m2/g), large pore volume (0.41 cm3/g) and higher hydrogen storage capacity. At the pressure of 5 bar, 3D-HPGT nanocomposite showed a maximum hydrogen capacity of 4.11 and 1.48 wt% at 77 and 298 K, respectively, which were much higher than those of previously reported graphene-based materials. The enhanced hydrogen storage capacities were attributed to the three-dimensional hierarchically porous structure, evenly distributed TiO2 nanoparticles on the graphene nanosheets, strong attachment of TiO2 nanoparticles to the underlying graphene nanosheets, and hydrogen spillover effect originated from TiO2 nanoparticles.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2018.04.036