Enhanced discharge energy density of rGO/PVDF nanocomposites: The role of the heterointerface
Journal article
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. https://doi.org/10.1063/1.5026180
| Authors | Zhang, Y, Wang, Y, Qi, S, Dunn, S, Dong, H and Button, T |
|---|---|
| Abstract | 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. |
| Year | 2018 |
| Journal | Applied Physics Letters |
| Journal citation | 112 (20), pp. 202904-202904 |
| Publisher | AIP |
| Digital Object Identifier (DOI) | https://doi.org/10.1063/1.5026180 |
| Publication dates | |
| 16 May 2018 | |
| Publication process dates | |
| Deposited | 09 Jan 2019 |
| Accepted | 01 Apr 2018 |
| Accepted author manuscript | License File Access Level Open |
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