Journal
NANO ENERGY
Volume 51, Issue -, Pages 604-612Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.06.072
Keywords
Supercapacitor; Graphene foam; Self-powered systems; Wearable systems; pH sensor; Energy storage
Categories
Funding
- EPSRC Engineering Fellowship for Growth - Printable Tactile Skin [EP/M002527/1]
- Scottish Funding Council through SFC-GCRF project on Energy Autonomous Bio-Sensor Patch suited for Affordable Self-Health Monitoring [SFC/AN/15/2016]
- EPSRC [EP/R029644/1, EP/M002527/1] Funding Source: UKRI
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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 mu W 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.
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