Copper-based catalyst, preparation method thereof, catalytic electrode for electrocatalytic reduction of carbon dioxide and application

The invention provides a copper-based catalyst, a preparation method thereof, a catalytic electrode for electrocatalytic reduction of carbon dioxide and application, and relates to the technical field of catalysts. The preparation method comprises the following steps: firstly providing a mixture A formed by a copper-containing compound, low-carbon alcohol, water and optional C3N4, then adding hydrogen peroxide into the mixture A for ultraviolet irradiation, and separating and drying a precipitate formed in the mixture A after ultraviolet irradiation to obtain the copper-based catalyst. The invention also provides the copper-based catalyst which is prepared by adopting the preparation method, and the copper-based catalyst has a uniform structure or composition with specific morphology, so that the copper-based catalyst can provide high-activity sites for deep reduction of carbon dioxide into a multi-carbon product through electro-catalysis, and the selectivity of the copper-based catalyst to the product is fur