Enhanced discharge energy density of rGO/PVDF nanocomposites: The role of the heterointerface
Zhang, Y, Wang, Y, Qi, S, Dunn, S, Dong, H and Button, T (2018). Enhanced discharge energy density of rGO/PVDF nanocomposites: The role of the heterointerface. Applied Physics Letters. 112 (20), pp. 202904-202904.
|Authors||Zhang, Y, Wang, Y, Qi, S, Dunn, S, Dong, H and Button, T|
Recent reports of conductive-filler/polymer composites with large dielectric permittivity (K) make them potential candidates for flexible capacitors. Hence, an interesting question is how these high K composites behave under a strong electric field strength. In this letter, we use in-situ-reduced graphite oxide (rGO)/poly(vinylidene fluoride) (PVDF) nanocomposites as an example to study the energy storage behaviour of high K materials. We show the dielectric behaviour contrasts between weak and strong fields. High K materials inevitably become more lossy with increasing field strength. Simultaneously, we reveal that the in-situ reduction temperature can affect the energy storage performance. Improved energy storage performance is achieved for a nanocomposite reduced at a moderate temperature. When reduced at 160 °C, a device with an rGO volume fraction of 1.5 vol. % displayed a discharge energy density of 0.67 J/cm3 at 50 MV/m. This was 2.9 times greater than pure PVDF. We develop a model to explain this behaviour that proposes a reduced electrical contrast of the rGO/PVDF heterointerface minimising the recombination of localized charge carriers. Our results indicate, simultaneously, the potential and limitation of high K nanocomposites and shed light on the optimisation of the design and fabrication of high discharge energy density flexible capacitors for microelectronic devices.
|Journal||Applied Physics Letters|
|Journal citation||112 (20), pp. 202904-202904|
|Digital Object Identifier (DOI)||doi:10.1063/1.5026180|
|16 May 2018|
|Publication process dates|
|Deposited||09 Jan 2019|
|Accepted||01 Apr 2018|
|Accepted author manuscript|
CC BY 4.0
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