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  Graphene-Based Three-Dimensional Frameworks and Thin Films for High Performance Supercapacitors  
Dr. Zhong-Shuai Wu:Max-Planck Institute for Polymer Research
    Graphene-based materials has attracted wide attention for supercapacitors because ofits advantageous features such as large surface area, good flexibility, good chemical and thermal stability, wide potential windows, rich surface chemistry, etc.In this talk, a simplified prototype device of high-performance all solid-state supercapacitors (ASSSs) based on 3D nitrogen and boron co-doped monolithic graphene aerogels (BN-GAs) will be present.The device possesses an electrode-separator-electrolyte integrated structure, in which the GAs serve as additive/binder-free electrodes and a polyvinyl alcohol (PVA)/H2SO4 gel as solid-state electrolyte and thinner separator. The as-prepared GAs show 3D interconnected frameworks with a macroporous architecture, which are favorable for ion diffusion and electron transport in bulk electrode.As a consequence, the resulting BN-GAs based device exhibits show high specific capacitance (~ 62 F g-1), good rate capability, and enhanced energy density (~8.65 Wh kg-1) or power density (~1600 W kg-1). Secondly, we will show the designed fabrication of novel graphene-based 3D frameworks with hierarchical macro- and meso-porous structures. Theinterconnected macropores are derived from hydrothermally assembled 3D graphene aerogels (GAs) while themesopores are generated by the silica networks uniformly grown on the surface of graphene, which render it a promising template for creating various 3D porous materials, such as GA basedmesoporous carbons (GA-MC) and metal oxide hybrids (GA-Co3O4, GA-RuO2). Benefiting from the integration of meso- and macro-porous structures, 3D GA-MC manifestsoutstanding specific capacitance (226 F g-1), high rate capability and excellent cycling stability (no capacitance lossafter 5000 cycles) when it is applied in electrochemical capacitors. Thirdly, the methane plasma reduced graphene-based thin films and CVD graphene for flexible and miniaturized micro-supercapacitors will be present.
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