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Synergy of Nano-ZnO and 3D-Graphene Foam Electrodes for Asymmetric Supercapacitor Devices

Toufani, Maryam (2020) Synergy of Nano-ZnO and 3D-Graphene Foam Electrodes for Asymmetric Supercapacitor Devices. [Thesis]

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Official URL: https://risc01.sabanciuniv.edu/record=b2486386 _(Table of contents)

Abstract

Two kinds of electrode materials were produced to fabricate asymmetric supercapacitor devices: (i) Highly defective, n-type wide bandgap semiconductor ZnO nanocrystalline electrodes below 50 nm weresynthesized with the aid of the high energy ball milling technique. (ii) Flexible 3D-graphene foams weresynthesized via the chemical vapor deposition technique. Extensive defect structure analysis was performed via enhanced characterization techniques mainly the spectroscopy ones: electron paramagnetic resonance (EPR), Raman, and photoluminescence (PL). Compared to bulk ZnO electrodes the nanoscale ZnO electrodes revealed a dramatic increase of defect concentration. The surface defect plays a crucial role in the electrochemical performance of supercapacitor devices. Strong decreases in charge transfer resistance were observed for the smallest crystallite size which is 15 nm. This work also shows that synthesis, controlling the defect structures, electronic and electrical characterization and the device production are extremely important to obtain high performance faradaic asymmetric supercapacitors

Item Type:Thesis
Uncontrolled Keywords:Supercapacitor. -- Zinc Oxide. -- Graphene Foam. -- Defect Structure. -- süper kapasitör. -- Zinc Oxide. -- Graphene Foam. -- Kusur.
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
ID Code:41208
Deposited By:IC-Cataloging
Deposited On:02 Nov 2020 16:14
Last Modified:02 Nov 2020 16:14

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