New! Results 2022

- the fabricated device showed excellent volumetric capacitance of about 5 F cm–3 at the current density of 0.7 mA cm–2, an outstanding volumetric power density of 19.42 W cm–3 with a high energy density of 0.98 mWh cm–3, achieving good cycling stability with a capacitance retention of 61% after 5000 cycles at a high rate of discharge current density, 100 A g–1.

- a modular device is obtained by combining 5 supercapacitor units, using an adhesive conductive epoxydic silver paste to ensure the electric conductivity, displaying 2 contact wires.

Modular device for energy storage containing multiple cells of modified CoHCF-based graphitized porous silicon electrodes.

- the charging/discharging of the modular device has been investigating by galvanostatic measurements, indicating the capacity of the device for outputting high voltages and reaching potentials of 7.5–9 V for a current of 1–2.5×10–5 A. The ratio between discharging and charging time was higher as the working potential window extended, thus it suggests that the most effective charging cycle was obtained for the –9/+9 V potential window with a maximum ratio.

Charging/discharging cycle of the modular device at a current of 10–5 A/ 2.5×10–5 A in different potential windows.

2022 published paper

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Results 2021

- new functional Si-few layers graphene interfaces, raised as thin, few nm film, to work as reliable electrodes for supercapacitors compelling the key performance indicators (KPIs) for Focus Area 2: Power oriented materials for electrochemical capacitors - the SET Plan Roadmap "Materials for Low Carbon Technologies"

- the device delivered the maximum energy density of 213 Wh kg^-1 at a power density of 40.63 kW kg-1 and an energy density of 57.3 Wh kg^-1, even at a high-power density of 1142.2 kW kg^-1 (manuscript in preparation)

Ragone plots for the cobalt containing hexacyanoferrate (CoHCF) on the graphitized porous silicon substrate working as CoHCF/C/Si symmetric supercapacitor.

- the developed device was tested in the operating mode, and a simple circuit was realized where the capacitor charges from a 3 V CR2032 battery and once charged it discharges through a variable resistance to light an LED, as it can be seen in the following video.

2021 published paper

 

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Expected results

- new functional Si-few layers graphene interfaces, raised as thin, few nm film, to work as reliable electrodes for supercapacitors

- supercapacitors compelling the key performance indicators (KPIs) for Focus Area 2: Power oriented materials for electrochemical capacitors - the SET Plan Roadmap "Materials for Low Carbon Technologies"

- intelligent power management of SCs and batteries in order to protect the batteries, thus enhancing their operational life

- strengthen Romanian leadership in the field of energy storage devices

- training PhD students and young researchers in the field of energy storage devices