Carbon dioxide electrochemical reduction copper indium bimetallic co-doped organic framework catalyst and its preparation method and application

Abstract

The invention discloses a carbon dioxide electrochemical reduction catalyst and its preparation method and application. The method comprises: dissolving copper salt and indium salt in a solvent at the same time, adding dimethylimidazole and benzenetricarboxylic acid at the same time, and mixing uniformly to form a precursor Then transfer the precursor solution to the reaction kettle for hydrothermal reaction, cool naturally, centrifuge, wash with methanol, and dry to obtain the precursor; place the prepared precursor in a tube furnace and feed nitrogen for 1 The calcination is carried out for ~3 hours, the calcination temperature is 250-450° C., and the calcination time is 4-24 hours to obtain a carbon dioxide electrochemical reduction catalyst. The invention significantly improves the specific surface area of ​​the catalyst, increases the electrochemical reduction catalytic activity of the catalyst for carbon dioxide reduction, and effectively inhibits the hydrogen evolution reaction. In particular, the catalytic activity, selectivity and current density of the electrocatalytic reduction of carbon dioxide to formic acid and carbon monoxide can be effectively improved by effectively regulating the anion species and doping concentration of different indium-doped precursors.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction catalysts, in particular to a co-doped bimetallic organic framework carbon dioxide electrochemical reduction catalyst and its preparation method and application. Background technique [0002] Since the industrial revolution, the rapid expansion of population and the massive burning of fossil fuels have made the concentration of carbon dioxide in the atmosphere higher and higher, which has reached 411ppm at present. Excessive accumulation of carbon dioxide will cause many environmental problems such as greenhouse effect and sea level rise. Therefore, how to control and reduce the content of carbon dioxide in the atmosphere has become the focus of research and attention. One of the effective means is to convert carbon dioxide into usable energy fuels and chemicals through electrochemical reactions. However, due to the extremely stable C=O double bond in the carbon ...

AI Technical Summary

Problems solved by technology

This catalyst has been applied to electrochemical devices such as lithium-ion batteries [J.Mater.Chem.A.1, 11126(2013)] and carbon dioxide electrochemical conversion [Nanoscale.11, 4911(2019)]. However, the current The catalytic activity and selectivity are poor, and the obtained current density is low, resulting in low final energy efficiency

To solve the above problems, copper-based catalysts with doped other metals can be used, however, multi-metal co-doped metal-organic framework carbon dioxide electrocatalysts with better electrochemical performance than single metal-organic frameworks have not been reported.

Images