期刊
CERAMICS INTERNATIONAL
卷 44, 期 11, 页码 12458-12465出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.04.036
关键词
Graphene-TiO2 nanocomposites; Three-dimensional; Hierarchically porous structure; Hydrogen storage; Hydrogen spillover effect
资金
- Basic and Frontier Research Program of Chongqing Municipality [cstc2016jcyjA0140, cstc2016jcyjA0451]
- National Natural Science Foundation of China [21603020]
- Innovation Team Project of Chongqing Municipal Education Commission [CXTDX201601037]
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 m(2)/g), large pore volume (0.41 cm(3)/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.
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