In Gyoo Kim - Highly Reduced Graphene Oxide for Supercapacity

Session 17: Power Technology

Highly Reduced Graphene Oxide for Supercapacitor by Combining UV Irradiation and Thermal Treatment
Wednesday, June 21, 2017 
5:00 PM - 5:20 PM

The supercapacitor (SC) has merits of fast response, high power density, and long life time. It can be used for a fast charger, a power backup device, a power stabilizer, energy harvesting devices, etc. In order to improve energy density of SC for competing with lithium-ion battery (LIB), it needs to increase specific surface area and electrical conductivity of electrode materials and one of the most convincing candidates is graphene. The graphene is fabricated as an electrode of SC, which has been resulted of the form of graphene oxide (GO) film. In this study, we report the fast and simple processes of GO reduction, which recover the physical properties of graphene, including photo and thermal reduction techniques. The photo reduction method has advantages of reducing GO within several milliseconds, which consumes less energy and is able to deoxidize GO adhered to any substrates, effectively. Furthermore, it increases specific surface area and surface roughness of GO film. But, it has a limit in reducing all parts of GO film with GO adhered to a substrate and it can be solved by combining the thermal reduction process. The structural change as a result of the reduction processes of GO films were analyzed by FT-IR, X-ray spectroscopy and Raman spectroscopy and the electrical properties by four point probe method. The electrochemical properties of supercapacitors were measured by cyclic voltammetry.

 

Speaker's Biography

I.G. Kim received the Ph.D. degree in physics from Korea University, Seoul, Korea, and has more than 15 years of experience in III-V semiconductor and silicon photonics based photonic device research. He is currently the research staff at Electronics and Telecommunications Research Institute, Daejeon, Korea. He has authored or coauthored more than 90 publications including conference proceedings and holds more than 20 patents within the fields of semiconductor optical devices. His present research interests include electrode materials for supercapacitors.  

 


SPEAKER
In Gyoo Kim
ETRI