The application belongs to the technical field of
zinc ion batteries, and specifically discloses a
zinc negative
electrode and application of the
zinc negative
electrode in a
zinc ion battery, wherein the zinc negative
electrode comprises zinc material, the surface of the zinc material is coated with a protective layer, the protective layer is composed of a
heterojunction material, a binder and an
organic solvent, the
mass ratio of the
heterojunction material, the
organic solvent and the binder is 7:2:1, the
heterojunction material is a Cu2O / CuO heterojunction, the preparation method of the Cu2O / CuO heterojunction is as follows: taking alkaline
copper chloride as a precursor and glucose as a
reducing agent, the Cu2O / CuO heterojunction is generated in an alkaline hydrothermal
system through one-step reaction, and then the Cu2O / CuO heterojunction is purified through hot
water washing, the heterojunction material contains
oxygen vacancies at the Cu2O / CuO interface, and the heterojunction interface forms a built-in
electric field and a
band bending. 2+ The Cu2O / CuO heterojunction protective layer of the application is driven by a built-in
electric field, is functionalized by
oxygen vacancies, and is self-aligned by a band, and the above-mentioned three mechanisms are synergized, so that the Zn 2+ full-path fast transportation, which is significantly better than existing single-phase or physical mixed protective
layers.