The application relates to the technical field of electrocatalytic reduction of
carbon dioxide, and provides a preparation method and application of a
zinc-
iodine diatomic pair (Zn-I / ICPs)
carbon dioxide electro-reduction catalyst. The
zinc-
iodine diatomic pair is prepared by using
nitrogen-
doped carbon as a carrier and an in-situ gas-capturing MOF method, and the specific steps are as follows: first, ZIF-8 precursors are prepared by using
zinc nitrate hexahydrate and 2-methyl
imidazole as raw materials; then, the ZIF-8 and
potassium iodide are co-pyrolyzed under a
nitrogen atmosphere, the
potassium iodide is used as an
iodine source, zinc and iodine atoms are combined in an atomic dispersion form through a gas-phase
doping mode, and a Zn-I diatomic pair is formed. The preparation method is simple and controllable, in the prepared Zn-I / ICPs, Zn sites and I sites successfully construct a synergistic catalytic center with complementary functions and electronic
coupling, can effectively control an electrochemical microenvironment, accelerate water dissociation and
proton transfer, and simultaneously highly effectively inhibit a
hydrogen evolution
side reaction, and the zinc-iodine diatomic pair can catalyze
carbon dioxide electro-reduction to prepare
carbon monoxide with
high activity and
high selectivity.