A method for
mass production of high-quality hollow carbon
nanocages comprises the following steps: 1) light
magnesium carbonate or
magnesium carbonate is added into a
reaction tube and spread evenly, the tube is put into a tubular furnace, air is pumped out of the tube,
inert gas such as N2 and Ar is injected; the
reaction temperature is increased to 670 DEG C-900 DEG C, (C) source vapor is introduced, and reaction is carried out for 5 to 240 minutes under the protection of 10-500sccm
inert gas
atmosphere; the (C) source gas is led to the reaction area of the tubular furnace by the
inert gas flow, carbonized on the surfaces of nano particles generated in situ, and covered to form a MgO@C structure; after the reaction, the temperature inside the
reaction tube drops to the
room temperature under the protection of the
inert gas; 2)
powder is collected from the
reaction tube, dipped in sufficient
hydrochloric acid or sulphuric acid for 5 to 720 minutes to remove the kernel of MgO, filtered, washed to neutrality by using deionized water, and dried to obtain the hollow carbon
nanocages; and 3) the
magnesium salt filtrate is recycled. The
nanocages prepared by the method have high purity, and the price for the precursor is low, thereby facilitating
recovery and reuse.