CN113458408A - Electrocatalysis with nano-wire structure and carbon dioxide reduction function and preparation method thereof - Google Patents

Electrocatalysis with nano-wire structure and carbon dioxide reduction function and preparation method thereof Download PDF

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CN113458408A
CN113458408A CN202110626403.7A CN202110626403A CN113458408A CN 113458408 A CN113458408 A CN 113458408A CN 202110626403 A CN202110626403 A CN 202110626403A CN 113458408 A CN113458408 A CN 113458408A
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solution
stirring
carbon dioxide
dioxide reduction
electrocatalyst
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常方方
刘永鹏
苗瑞芳
杨林
白正宇
张庆
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Henan Normal University
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    • B22F9/00Making metallic powder or suspensions thereof
    • B22F9/16Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • C25B11/04Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/073Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
    • C25B11/075Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
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Abstract

The invention discloses an electrocatalyst with an electrocatalytic carbon dioxide reduction function and a preparation method thereof, wherein the electrocatalyst has a nanowire structure and comprises the following specific steps: dissolving chloroauric acid, copper chloride dihydrate and glucose in water, and stirring and mixing uniformly to obtain a solution A; dissolving oleylamine in water, and stirring and mixing uniformly to obtain a solution B; adding the solution A into the solution B at room temperature, performing ultrasonic treatment for 30min, stirring and mixing uniformly at room temperature, transferring the suspension obtained by stirring into a high-pressure reaction kettle lined with polytetrafluoroethylene, performing sealed reaction at 120 ℃, and then performing centrifugal washing with ethanol and deionized water respectively at 10000rpm to obtain the carbon dioxide reduction function electrocatalyst. Au-Cu nanowire junction synthesized by the inventionHas excellent electrocatalytic CO2The synthetic method has simple operation, high reaction efficiency and low energy consumption.

Description

Electrocatalysis with nano-wire structure and carbon dioxide reduction function and preparation method thereof
Technical Field
The invention belongs to the technical field of electrocatalysis carbon dioxide reduction, and particularly relates to an electrocatalysis carbon dioxide reduction function electrocatalyst with a nanowire structure and a preparation method thereof.
Background
Excess CO emitted from fossil fuel combustion2Causing serious global environmental problems such as greenhouse effect, forest fire, melting of icebergs, and the like. Catalytic reduction of CO2The conversion of the carbon dioxide into a series of valuable products is the relief of excessive CO in the atmosphere2One of the ways of (1). The carbon dioxide reduction reaction may be carried out by thermal catalysis, photocatalysis, electrocatalysis or biocatalysis, but wherein CO is produced as a result of the electrocatalysis2Compared with other catalytic modes, the reaction has the advantages of mild conditions, simple and easily-operated reaction device, low cost and the like, and is concerned by more and more researchers. Ideal CO2The RR electrocatalyst has the characteristics of excellent activity, high selectivity, stability and the like, and most importantly, the RR electrocatalyst can inhibit the hydrogen evolution reaction so as to realize the high-efficiency and high-selectivity catalytic reduction of CO2. Therefore, an efficient electrocatalyst was developed to electrocatalytic CO2One of the important problems to be solved in the technical field of reductive catalyst synthesis.
Recently, it has been found that alloyed nanomaterials are effective in increasing CO2One of the methods of catalytic activity and selectivity of electrocatalytic reduction. In addition, the Au-Cu nano alloy catalyst is more favorable for guiding CO2Besides converting into target products and inhibiting side reactions, the catalyst is more economical and applicable than a single noble metal catalyst. The Au-Cu nanowire has large specific surface area and quantum confinement effect, can be in better contact with electrolyte, and has good CO2RR activity. In addition, the Au-based alloy has higher faraday efficiency than a single metal such as Au or Cu.
Noble metal nanocatalysts are widely used in many important fields of contemporary organic chemistry, fine chemistry, fuel cells, and the like. The price and rare reserves of precious metals limit their practical application. In order to solve these problems, many studies have been focused on reducing the amount of noble metal used and improving the utilization rate of the noble metal. Alloying of noble metals with non-noble metals is one of the ways to reduce the loading of noble metals and can significantly improve the catalytic activity and selectivity of the catalyst. Such as Au, Pt, Ag, Pd and their alloys, and can be used as high-efficiency catalyst. Metal nanowires are of particular interest due to their unique electrical, optical, and catalytic properties. And compared with bulk materials, one-dimensional nanowire materials are better in performance. Due to the large specific surface area and the quantum confinement effect of the one-dimensional nanowire material, the nanowire material has unique electrical, thermal, mechanical and optical properties.
Disclosure of Invention
The invention solves the technical problem of providing an electrocatalyst with an electrocatalytic carbon dioxide reduction function of a nanowire structure and a preparation method thereof.
The invention adopts the following technical scheme for solving the technical problems, and the electro-catalyst with the nano-wire structure and the electro-catalytic carbon dioxide reduction function and the preparation method thereof are characterized by comprising the following specific steps:
step S1: dissolving chloroauric acid, copper chloride dihydrate and glucose in water, and stirring and mixing uniformly to obtain a solution A;
step S2: dissolving oleylamine in water, and stirring and mixing uniformly to obtain a solution B;
step S3: adding the solution A into the solution B at room temperature, performing ultrasonic treatment for 30min, stirring and mixing uniformly at room temperature, transferring the suspension obtained by stirring into a high-pressure reaction kettle lined with polytetrafluoroethylene, performing sealed reaction at 120 ℃, and then performing centrifugal washing with ethanol and deionized water respectively at 10000rpm to obtain the carbon dioxide reduction function electrocatalyst which is in a uniform-diameter nanowire structure and has an average diameter of 20-30 nm.
Further limiting, the feeding molar ratio of the chloroauric acid to the copper chloride dihydrate in the step S1 is 1: 1.
Further, the sealing reaction time in step S3 is 12 h.
Compared with the prior art, the invention has the following beneficial effects:
1. the Au-Cu nanowire structure synthesized by the method has excellent electrocatalytic CO2The synthetic method has simple operation, high reaction efficiency and low energy consumption.
2. The Au-Cu electrocatalyst has a uniform diameter nanowire structure, has a large specific surface area and a quantum confinement effect, can be in better contact with an electrolyte, and has excellent CO2RR activity, can effectively improve the electrocatalytic activity of the catalyst.
3. In the invention, glucose is used as a reducing agent, oleylamine is used as a guiding agent, and the Au-Cu nanowire is formed.
4. Au-Cu electrocatalytic CO with nanowire structure synthesized by using method2 The reduction catalyst can not only improve the stability and prevent agglomeration, but also the catalytic activity of Au-Cu is higher than that of pure Au or pure Cu, which is due to the electronic effect and synergistic effect among different metals. Therefore, the method has wide application prospect in the electrocatalytic reduction catalyst technology.
Drawings
FIG. 1 shows Au prepared in example 1 of the present invention25Cu75TEM image of the nanowires;
FIG. 2 shows Au prepared in example 2 of the present invention50Cu50TEM image of the nanowires;
FIG. 3 shows Au prepared in example 3 of the present invention75Cu25TEM image of the nanowires;
FIG. 4 is a graph showing electrochemical properties of products obtained in example 1, example 2 and example 3 of the present invention.
Detailed Description
The present invention is described in further detail below with reference to examples, but it should not be construed that the scope of the above subject matter of the present invention is limited to the following examples, and that all the technologies realized based on the above subject matter of the present invention belong to the scope of the present invention.
Example 1
Cupric chloride dihydrate (11.625 mg), chloroauric acid (9.37 mg), and glucose (15.8 mg) were added to 5 mL of water and mixed uniformly to obtain a uniform solution a. Dissolve 160. mu.L oleylamine in 3 mL water and mix well to obtain solution B. The solution A was added to the solution B for 30min under sonication at room temperature, followed by stirring overnight. The suspension obtained by stirring was transferred to a 25 mL autoclave lined with polytetrafluoroethylene, and the autoclave was sealed at 120 ℃ for 12 hours. Thereafter, the Au — Cu nanowires were obtained by centrifugation three to four times with a certain volume of ethanol and deionized water, respectively, at 10000rpm, and dispersed in ethanol for future use.
Supporting Au-Cu nanowires on carbon to prepare Au25Cu75 NWs/C catalyst, which is then activated. Briefly, Vulcan XC-72 carbon was dispersed in ethanol by sonication and 4 mg Au was added by stirring25Cu75NWs was added to the carbon suspension. The mixed solution is ultrasonically and uniformly coated on the surface of a carbon paper electrode, an H-shaped electrolytic cell system is adopted, the performance of the catalyst is measured through an electrochemical workstation, and the electrical property test result is shown in figure 4.
Example 2
Cupric chloride dihydrate (7.75 mg), chloroauric acid (18.74 mg), and glucose (15.8 mg) were added to 5 mL of water and mixed uniformly to obtain a uniform solution a. Dissolve 160. mu.L oleylamine in 3 mL water and mix well to obtain solution B. The solution A was added to the solution B for 30min under sonication at room temperature, followed by stirring overnight. The suspension obtained by stirring was transferred to a 25 mL autoclave lined with polytetrafluoroethylene, and the autoclave was sealed at 120 ℃ for 12 hours. Thereafter, the Au — Cu nanowires were obtained by centrifugation three to four times with a certain volume of ethanol and deionized water, respectively, at 10000rpm, and dispersed in ethanol for future use.
Preparation of Au by loading Au-Cu nanowire on carbon50Cu50 NWs/C catalyst, which is then activated. Briefly, Vulcan XC-72 carbon was dispersed in ethanol by sonication and 4 mg Au was added by stirring50Cu50 NWs was added to the carbon suspension. The mixed solution is ultrasonically and uniformly coated on the surface of a carbon paper electrode, and an H-shaped electrolytic cell system is adopted and passes through an electrochemical workstationThe performance of the catalyst was measured, and the results of the electrical property test are shown in FIG. 4
Example 3
Cupric chloride dihydrate (3.875 mg), chloroauric acid (28.11 mg), and glucose (15.8 mg) were added to 5 mL of water and mixed well to obtain a homogeneous solution a. Dissolve 160. mu.L oleylamine in 3 mL water and mix well to obtain solution B. The solution A was added to the solution B for 30min under sonication at room temperature, followed by stirring overnight. The suspension obtained by stirring was transferred to a 25 mL autoclave lined with polytetrafluoroethylene, and the autoclave was sealed at 120 ℃ for 12 hours. Thereafter, the Au — Cu nanowires were obtained by centrifugation three to four times with a certain volume of ethanol and deionized water, respectively, at 10000rpm, and dispersed in ethanol for future use.
Preparation of Au by loading Au-Cu nanowire on carbon75Cu25NWs/C catalyst, which is then activated. Briefly, Vulcan XC-72 carbon was dispersed in ethanol by sonication and 4 mg Au was added by stirring75Cu25NWs was added to the carbon suspension. The mixed solution is ultrasonically and uniformly coated on the surface of a carbon paper electrode, an H-shaped electrolytic cell system is adopted, the performance of the catalyst is measured through an electrochemical workstation, and the electrical property test result is shown in figure 4
The foregoing embodiments illustrate the principles, principal features and advantages of the invention, and it will be understood by those skilled in the art that the invention is not limited to the foregoing embodiments, which are merely illustrative of the principles of the invention, and that various changes and modifications may be made therein without departing from the scope of the principles of the invention.

Claims (3)

1. An electrocatalysis with a nanowire structure and a carbon dioxide reduction function and a preparation method thereof are characterized by comprising the following specific steps:
step S1: dissolving chloroauric acid, copper chloride dihydrate and glucose in water, and stirring and mixing uniformly to obtain a solution A;
step S2: dissolving oleylamine in water, and stirring and mixing uniformly to obtain a solution B;
step S3: adding the solution A into the solution B at room temperature, performing ultrasonic treatment for 30min, stirring and mixing uniformly at room temperature, transferring the suspension obtained by stirring into a high-pressure reaction kettle lined with polytetrafluoroethylene, performing sealed reaction at 120 ℃, and then performing centrifugal washing with ethanol and deionized water respectively at 10000rpm to obtain the carbon dioxide reduction function electrocatalyst which is in a uniform-diameter nanowire structure and has an average diameter of 20-30 nm.
2. The electrocatalytic carbon dioxide reduction functional electrocatalyst of nanowire structure and the preparation method thereof according to claim 1, characterized in that: in the step S1, the feeding molar ratio of the chloroauric acid to the copper chloride dihydrate is 1: 1.
3. The electrocatalytic carbon dioxide reduction functional electrocatalyst of nanowire structure and the preparation method thereof according to claim 1, characterized in that: the sealing reaction time in step S3 was 12 h.
CN202110626403.7A 2021-06-04 2021-06-04 Electrocatalysis with nano-wire structure and carbon dioxide reduction function and preparation method thereof Pending CN113458408A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115142075A (en) * 2022-07-14 2022-10-04 电子科技大学 Preparation method of ZnO nanowire catalyst with controllable crystal face

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CN107639235A (en) * 2017-09-07 2018-01-30 浙江工业大学 A kind of preparation method and applications of golden copper nano-wire material
WO2018140226A1 (en) * 2017-01-24 2018-08-02 The Regents Of The University Of California Conductive core-shell metal nanowires for transparent conductors
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WO2018140226A1 (en) * 2017-01-24 2018-08-02 The Regents Of The University Of California Conductive core-shell metal nanowires for transparent conductors
WO2019034623A1 (en) * 2017-08-16 2019-02-21 Rhodia Operations Process for the manufacture of metal nanowires
CN107639235A (en) * 2017-09-07 2018-01-30 浙江工业大学 A kind of preparation method and applications of golden copper nano-wire material
CN108470603A (en) * 2018-04-23 2018-08-31 天津大学 A kind of preparation method of copper nano-wire transparent electrode
CN111229253A (en) * 2020-03-14 2020-06-05 北京工业大学 Electro-catalytic reduction of CO2Preparation method of nano Cu-Au alloy catalyst as energy source

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Publication number Priority date Publication date Assignee Title
CN115142075A (en) * 2022-07-14 2022-10-04 电子科技大学 Preparation method of ZnO nanowire catalyst with controllable crystal face

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