Copper-based tandem catalytic electrode as well as preparation process and application thereof

Abstract

The invention relates to an electrode material and belongs to the field of electrochemistry. A copper-based tandem catalytic electrode comprises a first catalytic layer with capture-reduction-aggregation effects for reducing CO2 into CO products and further comprises a second catalytic layer for reducing CO generated by the first catalytic layer into C2 + products, and the first catalytic layer and the second catalytic layer are in tandem catalysis and jointly reduce CO2 into the C2 + products. The first catalyst layer is a copper-based metal organic framework grown on a copper hydroxide nanowire array, and the second catalyst layer is a polished copper substrate and a copper hydroxide nanowire array grown on the substrate. The copper-based tandem catalyst decouples each step in a complex reaction path through concerted catalysis among multiple components, can effectively regulate and control the selectivity of a carbon-based product, can improve the reaction rate of CO2RR, can efficiently reduce carbon dioxide molecules in a system, and the prepared product is relatively low in hydrogen content and relatively low in cost. And the electrocatalytic carbon dioxide reduction efficiency is remarkably improved.

Description

technical field [0001] The invention relates to electrochemical catalysis, in particular to a copper-based series catalytic electrode and its preparation process and application. Background technique [0002] Electrochemical CO 2 Reduction reaction (CO 2 RR), which can be achieved by adding CO 2 Converting into valuable chemicals and fuels to close the man-made carbon cycle and store intermittent renewable energy, in addition, the technology can effectively mitigate the greenhouse effect caused by excessive carbon dioxide emissions while maintaining carbon neutrality. For practical applications, we need the CO 2 Conversion to carbon-based products with high reduction states other than CO and formate, such as hydrocarbons and alcohol oxygenates with higher energy density. However, high reduction potentials and poor selectivity usually limit their high yields of reduced carbon products due to multiple electron-proton transfer steps. [0003] Among many metal catalysts, Cu...

AI Technical Summary

Problems solved by technology

However, high reduction potential and poor selectivity usually limit their high yields of reduced carbon products due to multiple electron-proton transfer steps

[0003] Among many metal catalysts, Cu is currently the only one that can convert CO 2 Revert to C 2+ The metal of the product, but the Cu catalyst has problems such as poor selectivity; and the slow C-C coupling kinetics on the pure Cu catalyst surface hinders the application of production technology for industrial-level multi-carbon products

Images