To provide a composite in which manganese oxide nanoparticles in diameter of 100 nm or less are supported on carbon in a highly dispersed manner.
Composite powder having a precursor of manganese oxide nanoparticles supported on carbon in a highly dispersed manner is treated by rapid heating in a nitrogen atmosphere to progress crystallization of metal oxide, whereby manganese oxide nanoparticles are supported on carbon in a highly dispersed manner. The precursor of manganese oxide nanoparticles and the carbon nanoparticles supporting thereof are prepared by a mechanochemical reaction which imparts shear stress and centrifugal force to the reactant in a revolving reactor. It is desirable that the rapid heating treatment in a nitrogen atmosphere be carried out at 250°C to 600°C. The heated composite is further pulverized to eliminate the aggregation thereof, thereby making the dispersity of manganese oxide nanoparticles more uniform. Carbon nanofiber or Ketjenblack may be used as carbon.
NAOI KAZUKO
YONEKURA DAISUKE
TAMAMITSU KENJI
K & W LTD
UNIV TOKYO AGRICULTURE