Preparation method and application of Z-type heterojunction composite catalyst

Abstract

The invention belongs to the technical field of photoelectrocatalysis carbon dioxide reduction, and discloses a preparation method of a Z-type heterojunction composite catalyst, which comprises the following steps: dispersing potassium hextantalate in an absolute ethyl alcohol solution of cobalt phthalocyanine, stirring, carrying out ultrasonic treatment, and evaporating absolute ethyl alcohol; and calcining the obtained solid product at 300 DEG C for 2 hours to obtain the K8Ta6O19 / CoPc composite catalyst. Polyacid K8Ta6O19 rich in oxygen vacancies is introduced into cobalt phthalocyanine, and two semiconductors form a Z-type heterojunction, so that the electron-hole recombination rate can be effectively reduced, the carrier migration rate is improved, more oxygen vacancies and larger electrochemical activity surface area are contained, more active sites can be provided, and strong interaction with CO2 molecules is generated; therefore, the photoelectrocatalysis carbon dioxide reduction performance of the catalyst is greatly improved.

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