Metal OxideCarbon Composite Materials for Electrochemical Capacitors - PDF

							      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.