Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 23, Pages 33766-33774Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.08.288
Keywords
Graphene oxide; Hydrotalcite; Self-assembly; Polyimide; Energy storage density
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Funding
- National Key R&D Program of China [2017YFB0404700]
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In this study, a nanofiller composed of GO and HT was fabricated and incorporated into the PI matrix to prepare superior nanocomposite films with high energy storage density. Through electrostatic self-assembly, the contact area between graphene oxides was reduced, inhibiting the formation of conductive networks and increasing the energy storage density of the nanocomposite films.
In this paper, the nanofiller consisting of graphene oxide (GO) and organically modified hydrotalcite (HT) was fabricated via the electrostatic self-assembly and further reduced and incorporated into the polyimide (PI) matrix to prepare superior nanocomposite films with high energy storage density. It was observed by transmission electron microscopy (TEM) that the insulating HT facesheets were attached well onto the GO film to form a stable sandwich structure. The synthesized ternary nanocomposite film (1.0 rGO@HT/PI) showed high breakdown strength of 175.9 kV/mm and ultra-high dielectric constant at 10 kHz (epsilon r = 35.4), about 10 folds more than pure PI (epsilon r = 3.4), resulting in a maximum energy storage density of 4.84 J/cm3. On account of electrostatic selfassembly, HT nanosheets can efficiently reduce the contact area between graphene oxides and inhibit the formation of conductive networks, thus maintaining a high level of breakdown strength and increasing the energy storage density of the nanocomposite films.
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