Application of a powder photocatalyst on the surface of a bipolar membrane in CO2 reduction

Abstract

A bipolar film surface powder state photocatalyst in the application of CO2 reduction is to use the surface-loaded powder state photocatalytic bipolar film as the diaphragm of the cathode chamber and the anode chamber, and the surface of the cation exchange membrane of the bipolar film is loaded with P-type Semiconductor photocatalyst powder; the surface of the anion exchange membrane of the bipolar membrane is loaded with N-type semiconductor photocatalyst powder, the P-type semiconductor photocatalyst powder is used as a cathode, the N-type semiconductor photocatalyst powder is used as an anode, a xenon lamp is used as a light source, and an external voltage is applied Under the action, the photoelectric catalytic CO2 reduction is carried out, and the water oxidation reaction is carried out in the anode chamber. The water dissociation in the middle interface layer of the bipolar membrane not only provides continuous H+ for CO2 reduction, but also does not cause hydrogen evolution reaction due to high H+ concentration. At the same time, the ionic liquid improves the solubility of CO2 and the transfer rate of protons, improving the efficiency of CO2 reduction. .

Description

technical field [0001] The invention relates to a bipolar membrane catalyst in CO 2 The application in reduction, specifically, is an attached powder catalyst in the photoelectrocatalytic reduction of CO 2 The technical solution applied in. Background technique [0002] Semiconductor photocatalysis technology is an effective technical means to convert solar energy into chemical energy, which is of great significance to solve the energy shortage and reduce the pressure of environmental pollution. After years of exploration and accumulation by scientists from various countries, research in this field has made great progress, but overall, the efficiency of photocatalysis using solar energy is still relatively low. One of the main reasons is that the photogenerated electrons-holes cannot be effectively separated and recombined, resulting in a decrease in photocatalytic activity. Scholars at home and abroad have used various methods to separate photogenerated electrons-holes, ...

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Problems solved by technology

[0006] The problem of the present invention lies in the problem that the semiconductor photocatalyst powder is easy to agglomerate and difficult to recycle after the reaction in the prior art, the problem that the semiconductor photocatalyst photogenerated electron-hole separation efficiency is low, the problem that the semiconductor photocatalyst cannot work stably, efficiently and continuously, And provide bipolar film surface powder state photocatalyst in CO 2 Restoring apps

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