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Fabrication and Characteristic Analysis of Direct Printed Graphene Oxide Based Supercapacitors : 직접 인쇄된 그래핀 옥사이드 수퍼 커패시터의 제작 및 특성분석

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Authors

치아창비

Advisor
이정훈
Major
공과대학 기계항공공학부
Issue Date
2015-02
Publisher
서울대학교 대학원
Keywords
Direct printingGraphene OxidePhotothermal reductionElectrical double layer capacitorSupercapacitor
Description
학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2015. 2. 이정훈.
Abstract
This thesis reports an innovative approach to fabricate flexible interdigitated supercapacitors via the combination of graphene oxide (GO) patterning with an ultra-low-volume liquid dispenser and GO photo-thermal reduction. GO solution is delivered on a specific surface to create a functional nanostructure with high porosity, leading to a printed electrical double layer capacitor or supercapacitor that demonstrates a high energy density. High flexibility in terms of architecture and substrate material makes this energy storage device favorable for intelligent power applications.

21st century sees the continual revolution in the IT world that incessantly alters human life style, especially through the invention of may smart devices. Along with this development, there are increasing needs for electrical energy storage with high energy density that can meet the power demands of new smart circuits. For instance, energy harvesting for remote sensors requires supercapacitors fully integrated with on-chip circuitry. Bulky sandwich structure of a conventional supercapacitors are likely less effective in these applications. Alternative to that complicated structure, the use of porous material in interdigitated configuration on a substrate can be a feasible solution.

A low volume liquid handling instrument was employed in the printing process. It is programmable to deliver GO droplets onto a substrate to achieve a high resolution pattern. This essentially simplifies electrode patterning process because current collector components and masking procedures are avoided. In this manner, GO pattern was interdigitated on a PET film. Photothermal reduction approach was opted to recover the electrical properties of pristine graphene, using a commercial camera flash accessory. Optimization of flash reduction was of paramount importance to induce effective photothermal effect while maintain the integrity of the electrode structure. Through appropriate surface treatment and direct printing approach as well as optimized reduction conditions, supercapacitors can be realized on various substrates such as thin films and other device surfaces.

Device characterization was achieved through electrochemical means. Cyclic voltammetry, galvanostatic charging-discharging test, electrochemical impedance spectroscopy and capacitance retention test were performed and detailed in performance analysis.
Language
English
URI
https://hdl.handle.net/10371/123806
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