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Preparation method and application of nano-copper catalyst

A catalyst and nano-copper technology, which is applied to the preparation of nano-copper catalysts, and the preparation field of ultra-stable nano-copper prepared by electrochemical deposition, achieves the effects of simple preparation method, inhibiting surface copper from being oxidized, and improving selectivity

Active Publication Date: 2022-04-05
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods have made some progress in improving the product selectivity of copper-based catalysts for CO2RR, but they still face great challenges in maintaining the performance stability of copper-based catalysts.

Method used

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  • Preparation method and application of nano-copper catalyst
  • Preparation method and application of nano-copper catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The preparation concentration is 0.1mol L -1 Potassium bicarbonate solution, 0.01mol copper formate and 0.02mol sodium tartrate were dissolved in 100mL potassium bicarbonate solution to obtain a precursor solution.

[0031] (2) Place the carbon paper in the precursor solution in step (1), and use 50mL min -1rate into CO 2 Gas, apply 0.1Acm -2 A constant current was used to obtain a nano-copper catalyst after electrochemical reduction for 5 min.

[0032] figure 1 It is the scanning electron microscope image of the nano-copper catalyst prepared in Example 1. The nano-copper is in the shape of stacked particles, and the particle size is about 80-120nm.

[0033] figure 2 It is the electrocatalytic reduction CO of the nanometer copper catalyst prepared in embodiment 1 2 Performance diagram, it can be seen that the nano-copper catalyst can convert CO 2 Electrocatalytic conversion into a variety of high value-added C 2 The product has a Faraday efficiency of 71.3%...

Embodiment 2

[0036] (1) The preparation concentration is 0.1mol L -1 Potassium bicarbonate solution, 0.01mol copper acetate and 0.02mol sodium sulfonate were dissolved in 100mL potassium bicarbonate solution to obtain a precursor solution.

[0037] (2) Place the carbon paper in the precursor solution in step (1), and use 50mL min -1 rate into CO 2 Gas, apply 0.1A cm -2 A constant current was used to obtain a nano-copper catalyst after electrochemical reduction for 5 min.

Embodiment 3

[0039] (1) The preparation concentration is 0.1mol L -1 Potassium bicarbonate solution, 0.01mol copper acetylacetonate and 0.02mol sodium carboxylate were dissolved in 100mL potassium bicarbonate solution to obtain a precursor solution.

[0040] (2) Place the carbon paper in the precursor solution in step (1), and use 50mL min -1 rate into CO 2 Gas, apply 0.1A cm -2 A constant current was used to obtain a nano-copper catalyst after electrochemical reduction for 5 min.

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Abstract

The invention discloses a preparation method and application of a nano-copper catalyst. The method comprises the following steps: (1) preparing a bicarbonate solution, and dissolving an organic acid salt and a copper salt precursor in the bicarbonate solution; and (2) placing a conductive substrate in the solution obtained in the step (1), introducing at least one of N2 and CO2 gases, and simultaneously performing electrochemical reduction to obtain the nano-copper catalyst. The preparation method of the catalyst is simple, mild in condition and easy to operate. In the electrochemical reduction preparation process of the copper catalyst, the organic anions can be coordinated with copper on the surface of the catalyst and are induced to form an oriented crystal face, so that the stability and activity of the nano-copper catalyst are improved. When the nano-copper catalyst is applied to the process of electrocatalytic reduction of CO2, organic anions coordinated on the surface of the nano-copper catalyst can stabilize the valence state of surface copper and inhibit structural recombination of the catalyst in the electrocatalytic process, so that the nano-copper catalyst has excellent electrocatalytic reduction performance and stability of CO2.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a preparation method and application of a nano-copper catalyst, and relates to a preparation method and application of ultra-stable nano-copper based on electrochemical deposition. Background technique [0002] CO 2 The environmental problems caused by excessive emissions have aroused widespread concern worldwide, and the CO 2 Resource utilization is an important way to solve this problem. Among them, the use of renewable energy to convert CO 2 electrocatalytic reduction (CO 2 RR) is an effective method for high value-added chemicals and has become a research hotspot in the field of catalysis. Due to CO 2 Molecules are difficult to activate in the electrocatalytic process and there is a competitive hydrogen evolution reaction (HER), and the reaction process involves multi-step proton-electron coupling, making CO 2 RR faces many challenges such as large overpotential and low product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/075C25B3/01C25C1/12B82Y40/00
CPCY02P10/20
Inventor 朱英方鸣伟
Owner BEIHANG UNIV
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