Methanol can be decomposed to yield h2 that may be the alternative fuels for automobiles and fuel cells. the feasibility study for catalytic decomposition of methanol (dm) to co and h2 with (CU-ZnO)@c core- And yolk-shell nanoreactors was, therefore, carried out. the relatively low activation energy (ea), low reaction temperature, and high yields of h2 with the core-shell or yolk-shell nanoreactors were found, which may be associated with the fact of high collision frequency between CU-ZnO active species and methanol within the confined nanoreactors. the data obtained from the component fitted x-ray absorption near edge structure spectra suggest that metallic copper (CU) in the nanoreactors can promote the formation of h2 from the catalytic dm reaction. in addition, the reactivity of dm catalyzed by the nanoreactors increases with an increase of the zno fractions in the CU-ZnO encapsulated in carbon-shell.