Metal OxideCarbon Composite Materials for Electrochemical Capacitors - PDF
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Metal Oxide/Carbon Composite Materials for Electrochemical Capacitors Applications Kwang-Heon Kim, Sang-Bok Ma, Ji-Young Kim, Jin-Go Kim, Sang-Hoon Park, Seung-Bum Yoon, Seong-Min Bak and Kwang-Bum Kim* National Research Laboratory of Energy Conversion and Storage Materials Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Republic of Korea Electrochemical capacitors (ECs) are expected to be used in hybrid electric vehicles in combination with batteries or fuel cells because of their higher power density than batteries. ECs using electrical double layer capacitance of carbon based materials and pseudocapacitance of transition metal oxides are called electrochemical double layer capacitors (EDLC) and supercapacitors (or pseudocapacitor), respectively. Recently, metal oxide/carbon composite electrodes have been intensively studied for ECs to take full advantage of double-layer capacitance and pseudocapacitance. In metal oxides, the surface or a very thin surface layer is known to participate in the pseudocapacitive reaction since the pseudocapacitive reaction of metal oxide is a surface reaction. Electrode materials with a large surface area and a highly porous structure would effectively combine high energy with high power characteristics required for pseudocapacitors. Materials characterized by a bicontinuous structure of a solid phase surrounding interconnected pores in the range of a few tens of nanometers and high electronic conductivity, would be excellent candidate materials for high-performance supercapacitors. Attaching metal or metal oxide nanoparticles to carbon is of interest to obtaining metal oxide nanoparticle/Carbon composite hybrid materials. This paper presents the novel synthesis methodology and electrochemical characterization of metal oxides electrodes/Carbon composite materials for electrochemical capacitor applications. More details will be discussed at the meeting.nanocomposite will be presented at the meeting.