Flexible self-charging supercapacitor based on graphene-Ag-3D graphene foam electrodes

Abstract

A flexible three-dimensional porous graphene foam-based supercapacitor (GFSC) is presented here for energy storage applications. With a novel layered structure of highly conductive electrodes (graphene-Ag conductive epoxy–graphene foam), forming an electrochemical double layer, the GFSC exhibits excellent electrochemical and supercapacitive performance. At a current density of 0.67 mA cm−2, the GFSCs show excellent performance with areal capacitance (38 mF cm−2) about three times higher than the values reported for flexible carbon-based SCs. The observed energy and power densities (3.4 µW h cm−2 and 0.27 mW cm−2 respectively) are better than the values reported for carbon-based SCs. Analyzed under static and dynamic bending conditions, the GFSCs are stable with up to 68% capacitance retention after 25000 charge–discharge cycles. The light-weight, cost-effective fabrication and no self-heating make the GFSCs a promising alternative to conventional source of energy in the broad power density ranging from few nW cm−2 to mW cm−2. In this regard, GFSC was integrated with a flexible photovoltaic cell resulting in a flexible self-charging power pack. This pack was successfully utilized to power continuously a wearable CuO nanorod based chemi-resistive pH sensor.

Citation

Manjakkal, L., Núñez, C. G., Dang, W., & Dahiya, R. (2018). Flexible self-charging supercapacitor based on graphene-Ag-3D graphene foam electrodes. Nano Energy, 51, 604-612. https://doi.org/10.1016/j.nanoen.2018.06.072

• Journal Article Type: Article
• Acceptance Date: Jun 20, 2018
• Online Publication Date: Jun 25, 2018
• Publication Date: 2018-09
• Deposit Date: Jul 19, 2022
• Publicly Available Date: Jul 20, 2022
• Journal: Nano Energy
• Print ISSN: 2211-2855
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 51
• Pages: 604-612
• DOI: https://doi.org/10.1016/j.nanoen.2018.06.072
• Keywords: Supercapacitor, Graphene foam, Self-powered systems, Wearable systems, pH sensor, Energy storage
• Public URL: http://researchrepository.napier.ac.uk/Output/2890696