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Three-dimensional porous graphene (3D PG) synthesised using different hydrothermal treatment times was obtained by an environmentally friendly freeze-drying method. The as-prepared 3D PG was characterised by Raman spectroscopy, scanning electron microscopy, thermogravimetric analysis and Brunauer–Emmett–Teller measurement. The results showed that 3D porous graphene synthesised over a shorter hydrothermal...
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