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Zinc oxide-based carbon dioxide reduction electrocatalyst and preparation method thereof

An electrocatalyst, carbon dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon monoxide, physical/chemical process catalyst, etc., can solve the complicated synthesis process, high starting potential, and harsh conditions for carbon dioxide chemical conversion reaction and other problems, to achieve the effect of simple preparation method, low onset potential and excellent catalytic effect

Inactive Publication Date: 2018-05-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon dioxide is the most stable oxidation state of carbon, and requires high energy to be activated and then reduced, making the chemical conversion reaction conditions of carbon dioxide harsh
However, the starting potential of the material for electrochemical reduction of carbon dioxide is relatively high, and the synthesis process is relatively cumbersome.

Method used

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  • Zinc oxide-based carbon dioxide reduction electrocatalyst and preparation method thereof
  • Zinc oxide-based carbon dioxide reduction electrocatalyst and preparation method thereof
  • Zinc oxide-based carbon dioxide reduction electrocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Add 0.5 mol Zn(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to obtain 10 mL of Zn(NO 3 ) 2 solution, 4 mol KOH was dissolved in deionized water to obtain 10 mL of KOH solution with a concentration of 4 mol / L. At a stirring rate of 600 rpm, the Zn(NO 3 ) 2 The solution was added dropwise to the KOH solution until the Zn(NO 3 ) 2 The entire solution is transferred;

[0029] (2) Place the above suspension in an airtight container at 50 o C was reacted for 12 h, and the precipitate obtained by the reaction was washed with absolute ethanol and deionized water successively and centrifuged, and the washing was stopped when the pH value of the centrifuged solution reached 7.5. o C was dried in vacuum for 9 h to obtain dandelion-like ZnO nanomaterials.

[0030] The zinc oxide nanomaterials provided in the above embodiments of the present invention were characterized by XRD and SEM. figure 1 It is the XRD characterization result, the peak position of each crys...

Embodiment 2

[0034] (1) Add 0.5 mol Zn(CH 3 COO) 2 Dissolved in deionized water to obtain 10 mL of Zn(CH 3 COO) 2 solution, 4 mol KOH was dissolved in deionized water to obtain 10 mL of KOH solution with a concentration of 4 mol / L. At a stirring rate of 600rpm, the Zn(CH 3 COO) 2 The solution is directly poured into the KOH solution;

[0035] (2) Put the above suspension in an airtight container at 40 o C was reacted for 10 h, and the precipitate obtained by the reaction was washed with absolute ethanol and deionized water successively and centrifuged, and the washing was stopped when the pH value of the centrifuged liquid reached 7.5. o C was dried in vacuum for 9 hours to obtain flaky zinc oxide nanomaterials.

Embodiment 3

[0037] (1) Add 0.5 mol ZnCl 2 Dissolve in deionized water to obtain 10 mL of ZnCl with a concentration of 0.5 mol / L 2 solution, 4 mol KOH was dissolved in deionized water to obtain 10 mL of KOH solution with a concentration of 4 mol / L. At a stirring rate of 600 rpm, the ZnCl 2 The solution was added dropwise to the KOH solution until the ZnCl 2 The entire solution is transferred;

[0038] (2) Put the above suspension in an airtight container at 60 o C was reacted for 15 h, and the precipitate obtained by the reaction was washed successively with absolute ethanol and deionized water and centrifuged, and the washing was stopped when the pH value of the centrifuged solution reached 7.5. o C was dried in vacuum for 9 h to obtain rod-shaped zinc oxide nanomaterials.

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Abstract

The invention provides a zinc oxide-based carbon dioxide reduction electrocatalyst and a preparation method thereof. The catalyst is prepared from a chemical composition, i.e., ZnO, and is a dandelion-shaped particle with the particle size being 2.0 to 3.4mu m, wherein the hexagonal-prism ZnO forming the dandelion-shaped particle has the diameter being 60 to 90nm and the length being 1.0 to 1.7mum. According to the zinc oxide-based carbon dioxide reduction electrocatalyst and the preparation method thereof provided by the invention, the dandelion-shaped nano-zinc oxide is prepared through a liquid phase precipitation method. The invention has the advantages that the novel zinc oxide-based carbon dioxide reduction electrocatalyst with the characteristics of low initial potential, small tafel slope, favorable stability, higher selectivity and the like is provided, and meanwhile, the preparation method provided by the invention is simple in preparation process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of metal oxide nanomaterial preparation, and in particular relates to a zinc oxide-based carbon dioxide reduction electrocatalyst and a preparation method thereof. Background technique [0002] The resource utilization of carbon dioxide can not only greatly reduce greenhouse gas emissions, reduce the serious impact of the greenhouse effect, but also obtain products with high industrial added value. Carbon dioxide is the most stable oxidation state of carbon, and requires high energy to be activated and then reduced, making the chemical conversion reaction conditions of carbon dioxide harsh. The electrocatalytic reduction of carbon dioxide has mild reaction conditions. While effectively reducing the activation energy of the carbon dioxide reaction, it also has the advantages of controllable reaction conversion degree, adjustable product selectivity, green raw materials and products, and no pollution. It provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/02C01B32/40B01J35/00
CPCB01J23/06B01J35/50B01J35/40
Inventor 路艳罗姜俏杨文胜陈旭
Owner BEIJING UNIV OF CHEM TECH
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