The present invention can limit the size of metal oxide particles to a few nanometers by in-situ growth of nanocrystals in pores using nanoporous organic polymers formed on the basis of covalent bonds, A covalent organic polymer containing metal oxide nanocrystals in the pores of a nanoporous covalent organic polymer capable of controlling the shape of a metal oxide by controlling the dispersing power of the nanoparticles using wettability to different solvents, Oxide nanocomposite structure and a manufacturing method thereof. According to the present invention, it is possible to produce a nanocomposite structure of a covalently bonded organic polymer and a metal oxide having a high degree of dispersion and a controlled size without using a surfactant. The nanocomposite structure produced has excellent capacity at high current density And thus can be economically useful for energy storage and conversion applications.
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