Amorphous copper tin oxide nano material and preparation method and application thereof
The amorphous copper-tin oxide nanomaterials are prepared by composite of stannate ions and copper ions, which solves the problems of low activity and low efficiency of tin-based catalysts in CO2 electrocatalytic reduction reaction, and achieves efficient preparation of formic acid, simplifies the preparation process and reduces costs.
Patent Information
- Application Number
- CN202510650463.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2025-08-12
AI Technical Summary
The existing tin-based catalysts have few active sites in the CO2 electrocatalytic reduction reaction, insufficient adsorption and activation ability of CO2 molecules, and have high energy consumption and long cycles, making it difficult to prepare macroscopicly, resulting in low CO2RR reaction activity and Faraday formic acid.
Amorphous copper-tin oxide nanomaterials were prepared by composite stannate ions and copper ions. They were stirred at room temperature and dried at 55°C to 60°C to form an amorphous structure, increasing active sites and improving conductivity, promoting dissociation of H2O molecules, and enhancing the activation ability of CO2 and H2O molecules.
Within the potential range of -0.8V to -1.3V, the Faraday efficiency of formic acid reaches 66.5% to 94.87%, which solves the problems of low activity and low efficiency of tin-based catalysts, and the preparation process is simple, low cost and green and environmentally friendly.
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Figure CN120463233A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of CO2 efficient conversion, and in particular to an amorphous copper-tin oxide nanomaterial and a preparation method and application thereof. Background Art
[0002] Overreliance on non-renewable fossil fuels has resulted in massive CO2 emissions, disrupting the natural carbon balance and accelerating the greenhouse effect, leading to a series of environmental problems that seriously threaten Earth's ecology and human survival. Currently, atmospheric CO2 concentrations have risen from 280 ppm before the Industrial Revolution to approximately 420 ppm today. To address the catastrophic impacts of rising CO2 concentrations on the environment and climate, scientists are focusing on developing effective technologies to reduce atmospheric CO2 concentrations.
[0003] The efficient conversion of CO2 utilizes the physical and chemical properties of CO2 itself and transforms CO2 gas into valuable chemicals or fuels through a variety of catalytic processes. This can not only effectively alleviate the environmental problems caused by the increasing amount of CO2, but also provide high-value-added fuels or chemicals, which has important practical application value.
[0004] CO2 is a linear molecule with a C=O bond energy of 750-804 kJ / mol. This high bond energy makes CO2 thermodynamically stable and kinetically relatively inert in chemical transformations. Activating the C=O bond and achieving efficient CO2 conversion under mild conditions is of great scientific research value. CO2 electrocatalytic reduction (CO2RR) is a highly promising carbon-negative technology due to its mild reaction conditions, controllable reaction process, and energy efficiency.
[0005] Currently, no fewer than 16 reduction products have been identified that can be generated through the CO2RR reaction. Among these, the conversion of carbon dioxide into formic acid (or formates) is considered one of the most promising pathways for industrialization. Formate is widely used in the leather and pharmaceutical industries, and its economic value as a feedstock for animal husbandry is considerable. Formate is considered an excellent hydrogen storage carrier, providing raw material for direct formic acid fuel cells, which can power small portable electronic devices like mobile phones, as well as larger stationary power sources and vehicles.
[0006] Due to the environmental friendliness and low cost of metallic tin, researchers have been exploring how to use metallic tin and its oxides as catalysts in the production of formate. However, the preparation of existing tin-based catalysts typically involves high-temperature hydrothermal (solvothermal) methods, high-temperature calcination, or electrochemical deposition. These processes are characterized by long preparation cycles, high energy consumption, and difficulty in large-scale production. Furthermore, the prepared tin-based catalysts have few active sites, insufficient adsorption and activation capabilities for CO2 molecules, and lack of activation capabilities for H2O molecules. This results in low CO2RR activity and low Faradaic efficiency for the formic acid product. Summary of the Invention
[0007] The present invention provides an amorphous copper-tin oxide nanomaterial, a preparation method, and an application thereof. The present invention prepares the copper-tin oxide nanomaterial by compounding stannate ions with copper ions. The copper-tin oxide nanomaterial is applied to a reaction of catalyzing the reduction of CO2 to generate formic acid or formate, achieving an excellent catalytic effect. Due to the introduction of the copper element and the amorphous structure of the copper-tin oxide nanomaterial, the number of exposed active sites is increased, the adsorption and activation capabilities of CO2 molecules, and the activation capabilities of H2O molecules are enhanced, thereby solving the technical problems of low CO2RR activity and low formic acid Faradaic efficiency existing in tin-based catalysts.
[0008] The first object of the present invention is to provide a method for preparing an amorphous copper tin oxide nanomaterial, comprising the following steps: 2- Cu was added to the source aqueous solution 2+ The source aqueous solution was stirred at room temperature to obtain amorphous copper tin oxide nanomaterials.
[0009] As a preferred embodiment, the SnO3 2- With Cu 2+ The molar ratio is 1:0.8~1.2.
[0010] As a preferred embodiment, the SnO3 2- Source aqueous solution and Cu 2+ The concentration of the source aqueous solution is 0.1mol / L~1mol / L, and the SnO3 2- With Cu 2+ The molar ratio is 1:1.
[0011] As a preferred embodiment, the stirring time at room temperature is 10 min to 60 min.
[0012] As a preferred embodiment, the SnO3 2- The source is sodium stannate or potassium stannate.
[0013] As a preferred embodiment, the Cu 2+ The source is copper nitrate or copper chloride.
[0014] As a preferred embodiment, after stirring at room temperature, a precipitate is obtained, washed, and dried at 55° C. to 60° C. to obtain an amorphous copper-tin oxide nanomaterial.
[0015] The second object of the present invention is to provide an amorphous copper-tin oxide nanomaterial prepared by the above preparation method.
[0016] A third object of the present invention is to provide an amorphous copper tin oxide nanomaterial for use in catalyzing CO2 to produce formic acid and / or formate, wherein the Faradaic efficiency of formic acid is 66.5% to 94.87% within a potential range of -0.8 V to -1.3 V vs. RHE (relative to reversible hydrogen electrode).
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] The present invention provides an amorphous copper-tin oxide nanomaterial. The amorphous copper-tin oxide nanomaterial is obtained by combining stannate ions with copper ions. Because the amorphous copper-tin oxide nanomaterial has a large number of defect structures and coordinatively unsaturated surface atoms, it can provide abundant catalytic reaction active sites when used as a catalyst. Furthermore, the introduction of copper not only improves the electrical conductivity of the copper-tin oxide nanomaterial but also promotes the dissociation of H2O molecules, providing protons for the reduction of CO2. This enhances the adsorption and activation of CO2 molecules and the activation of H2O molecules, thereby effectively resolving the technical problems of low CO2RR activity and low formic acid Faradaic efficiency associated with tin-based catalysts.
[0019] The invention has the characteristics of low cost, simple preparation process, green preparation process without involving toxic and harmful substances, short preparation cycle and easy large-scale preparation. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is an XRD comparison chart of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention and the copper-tin oxide nanomaterial prepared in Comparative Example 3.
[0021] Figure 2 These are the TEM images and selected area electron diffraction patterns of the amorphous copper tin oxide nanomaterial prepared in Example 1 of the present invention; wherein, Figure A is 20 nm, Figure B is 5 nm, and Figure C is a selected area electron diffraction pattern.
[0022] Figure 3 This is the X-ray photoelectron spectrum of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention; wherein, Figure A is Sn 3d and Figure B is Cu 2p.
[0023] Figure 4This is an SEM image of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention.
[0024] Figure 5 This is the EDS mapping diagram of the O element of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention.
[0025] Figure 6 This is the EDS mapping diagram of the Cu element of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention.
[0026] Figure 7 This is the EDS mapping diagram of the Sn element of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention.
[0027] Figure 8 This is the XRD pattern of the copper-tin oxide nanomaterial prepared in Comparative Example 1 of the present invention.
[0028] Figure 9 This is the XRD pattern of the copper-tin oxide nanomaterial prepared in Comparative Example 2 of the present invention.
[0029] Figure 10 FIG2 is a diagram of the apparatus for performing CO2RR testing in an H-type electrolytic cell according to the present invention.
[0030] Figure 11 The representative spectrum of the liquid phase product was analyzed using nuclear magnetic resonance spectroscopy (H spectroscopy) for the present invention.
[0031] Figure 12 This is a diagram showing the catalytic performance of the amorphous copper tin oxide nanomaterial prepared in Example 1 of the present invention for electrocatalytic reduction of CO2 to produce formic acid.
[0032] Figure 13 This is a catalytic performance diagram of the copper-tin oxide nanomaterial prepared in Comparative Example 1 of the present invention for electrocatalytic CO2 reduction to produce formic acid.
[0033] Figure 14 This is a diagram showing the catalytic performance of the copper-tin oxide nanomaterial prepared in Comparative Example 2 of the present invention for electrocatalytic CO2 reduction to produce formic acid.
[0034] Figure 15 Catalytic performance diagram of the copper tin oxide nanomaterial prepared in comparative example 3 of the present invention for electrocatalytic CO2 reduction to produce formic acid DETAILED DESCRIPTION
[0035] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention is further described below with reference to specific examples and accompanying drawings. However, the examples are not intended to limit the present invention. The following experimental and detection methods are conventional methods unless otherwise specified; the reagents and raw materials are commercially available unless otherwise specified.
[0036] Regarding the problems mentioned in the background technology of the present invention: First, existing tin-based catalysts have few active sites, insufficient adsorption and activation capabilities for CO2 molecules, and lack the ability to activate H2O molecules, resulting in low CO2RR reaction activity and the Faradaic efficiency of formic acid products; Second, the preparation process of existing tin-based catalysts usually involves high-temperature hydrothermal (solvothermal), high-temperature calcination or electrochemical deposition preparation methods, which have the problems of long preparation cycle, high energy consumption, and difficulty in large-scale preparation. Based on the above-mentioned technical problems, the present invention provides an amorphous copper tin oxide nanomaterial and its preparation method and application.
[0037] The technical contents of the present invention are analyzed and explained in detail below.
[0038] The present invention first provides a method for preparing an amorphous copper tin oxide nanomaterial, comprising the following steps: 2- Cu was added to the source aqueous solution 2+ The source aqueous solution was stirred at room temperature for 10 min to 60 min to obtain amorphous copper tin oxide nanomaterials.
[0039] In order to obtain amorphous copper tin oxide nanomaterials, the SnO3 2- With Cu 2+ The molar ratio of SnO3 is 1:0.8~1.2. 2- With Cu 2+ When the molar ratio of copper tin oxide to formic acid is 1:1, the amorphous copper tin oxide nanomaterial prepared therefrom has the best effect on catalyzing CO2 to produce formic acid and / or formate.
[0040] It should be noted that the SnO3 2- The source is sodium stannate or potassium stannate; the Cu 2+ The source is copper nitrate or copper chloride.
[0041] In order to obtain nanomaterials with a higher yield and higher purity, the process is stirred at room temperature to obtain a precipitate, which is then washed and dried at 55° C. to 60° C. to obtain an amorphous copper-tin oxide nanomaterial.
[0042] The above-mentioned amorphous copper tin oxide nanomaterial is applied to catalyze the production of formic acid and / or formate from CO2 at -0.8V to -1.3V (relative to the reversible hydrogen electrode, V RHE) potential range, the Faradaic efficiency of formic acid is 66.5% to 94.87%.
[0043] The technical effects of the present invention are described in detail below through specific embodiments and comparative examples.
[0044] Example 1
[0045] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0046] According to SnO3 2- With Cu 2+ To 10 mL of 1 mol / L sodium stannate aqueous solution was quickly poured 10 mL of 1 mol / L copper chloride aqueous solution at a molar ratio of 1:1, and the mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 °C for 24 h to obtain amorphous copper tin oxide nanomaterials.
[0047] Example 2
[0048] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0049] According to SnO3 2- With Cu 2+ To 100 mL of a 1 mol / L sodium stannate aqueous solution was quickly poured 80 mL of a 1 mol / L copper chloride aqueous solution at a molar ratio of 1:0.8. The mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 °C for 24 h to obtain an amorphous copper tin oxide nanomaterial.
[0050] Example 3
[0051] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0052] According to SnO3 2- With Cu 2+ To 100 mL of a 1 mol / L sodium stannate aqueous solution was quickly poured 120 mL of a 1 mol / L copper chloride aqueous solution at a molar ratio of 1:1.2. The mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 °C for 24 h to obtain an amorphous copper tin oxide nanomaterial.
[0053] Example 4
[0054] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0055] According to SnO32- With Cu 2+ To 10 mL of a 0.5 mol / L sodium stannate aqueous solution was quickly poured 10 mL of a 0.5 mol / L copper chloride aqueous solution at a molar ratio of 1:1. The mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 55 °C for 24 h to obtain amorphous copper tin oxide nanomaterials.
[0056] Example 5
[0057] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0058] According to SnO3 2- With Cu 2+ To 10 mL of 1 mol / L sodium stannate aqueous solution was quickly poured 10 mL of 1 mol / L copper chloride aqueous solution in a molar ratio of 1:1, and the mixture was stirred at room temperature for 20 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 °C for 24 h to obtain amorphous copper tin oxide nanomaterials.
[0059] Example 6
[0060] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0061] According to SnO3 2- With Cu 2+ To 10 mL of a 1 mol / L sodium stannate aqueous solution was quickly poured 10 mL of a 1 mol / L copper chloride aqueous solution at a molar ratio of 1:1.1, and the mixture was stirred at room temperature for 60 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 ° C for 24 h to obtain an amorphous copper tin oxide nanomaterial.
[0062] Example 7
[0063] A method for preparing an amorphous copper-tin oxide nanomaterial comprises the following steps:
[0064] According to SnO3 2- With Cu 2+ To 10 mL of a 1 mol / L potassium stannate aqueous solution was quickly poured 10 mL of a 1 mol / L copper nitrate aqueous solution at a molar ratio of 1:1, and the mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 °C for 24 h to obtain amorphous copper tin oxide nanomaterials.
[0065] In order to further illustrate the technical effects of the present invention, the present invention also provides a comparative example, which is as follows:
[0066] Comparative Example 1
[0067] Compared with Example 1, the difference is that SnO3 2- With Cu 2+ The molar ratio was adjusted from 1:1 to 2:1.
[0068] A method for preparing a copper-tin oxide nanomaterial comprises the following steps:
[0069] According to SnO3 2- With Cu 2+ 2:1 molar ratio, 10 mL, 1 mol / L copper chloride aqueous solution was quickly poured into 20 mL, 1 mol / L sodium stannate aqueous solution, and continued stirring at room temperature for 10 min to obtain a sky blue solid precipitate, which was washed three times with deionized water and dried in an oven at 60 ° C for 24 h to obtain copper tin oxide nanomaterials.
[0070] Comparative Example 2
[0071] Compared with Example 1, the difference is that SnO3 2- With Cu 2+ The molar ratio was adjusted from 1:1 to 1:2.
[0072] A method for preparing a copper-tin oxide nanomaterial comprises the following steps:
[0073] According to SnO3 2- With Cu 2+ To 10 mL of 1 mol / L sodium stannate aqueous solution was quickly poured 20 mL of 1 mol / L copper chloride aqueous solution at a molar ratio of 1:2. The mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The solid precipitate was washed three times with deionized water and dried in an oven at 60 °C for 24 h to obtain copper tin oxide nanomaterials.
[0074] Comparative Example 3
[0075] Compared with Example 1, the difference is that the amorphous copper tin oxide nanomaterial is calcined at 600° C. for 2 h.
[0076] A method for preparing a copper-tin oxide nanomaterial comprises the following steps:
[0077] According to SnO3 2- With Cu 2+In a molar ratio of 1:1, 10 mL of a 1 mol / L aqueous solution of sodium stannate was quickly poured into 10 mL of a 1 mol / L aqueous solution of copper chloride, and the mixture was stirred at room temperature for 10 min to obtain a sky blue solid precipitate. The precipitate was washed three times with deionized water and dried in an oven at 60 ° C for 24 h to obtain an amorphous copper tin oxide nanomaterial. The amorphous copper tin oxide nanomaterial was then calcined in a muffle furnace at 600 ° C for 2 h to obtain a copper tin oxide nanomaterial.
[0078] The morphology of the amorphous copper tin oxide nanomaterial prepared by the present invention and the effect of electrocatalysis of CO2 to produce formic acid and / or formate were characterized and tested, and the results are as follows.
[0079] The XRD patterns of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention and the copper-tin oxide nanomaterial prepared in Comparative Example 3 are as follows: Figure 1 As shown by Figure 1 It can be seen that the product of Example 1 is an amorphous structure and does not produce a crystalline state; while in Comparative Example 3, the amorphous copper-tin oxide nanomaterial prepared in Example 1 is calcined at a high temperature to produce a crystalline state.
[0080] The TEM image and selected area electron diffraction image of the amorphous copper tin oxide nanomaterial of Example 1 of the present invention are as follows: Figure 2 As shown. Figure 2 It can be seen that the microscopic morphology of the prepared material is amorphous nanoparticles.
[0081] Figure 3 This is the X-ray photoelectron spectrum of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention; wherein, Figure A is Sn 3d and Figure B is Cu 2p. Figure 3 It can be seen that the valence states of Cu and Sn in the prepared materials are +2 and +4 oxidation states, respectively.
[0082] The SEM image of the amorphous copper tin oxide nanomaterial prepared in Example 1 of the present invention is as follows: Figure 4 As shown in Figure 2, the EDS distribution of O, Cu and Sn elements in amorphous copper-tin oxide nanomaterials is as follows: Figures 5 to 7 .
[0083] Figure 8 and Figure 9 The XRD patterns of the copper tin oxide nanomaterials prepared in Comparative Examples 1 and 2 of the present invention are shown respectively. Figure 8 and Figure 9 It can be seen that by changing SnO3 2- With Cu 2+ The molar ratio of the copper tin oxide nanomaterials is converted into a crystalline state, thereby having a greater impact on the effect of electrocatalytic CO2 to produce formic acid and / or formate.
[0084] CO2RR test process and formic acid product detection
[0085] 1. CO2RR Testing Process
[0086] 1. Prepare the Working Electrode
[0087] In the CO2 electrocatalytic reduction test conducted in an H-type electrolytic cell, the working electrode is usually a mixture of a catalyst and a conductive agent, added to a solvent containing a Nafion binder, configured into a catalyst ink, and then the catalyst ink is drop-coated on the electrode.
[0088] Preparation of catalyst ink:
[0089] First, grind the catalyst into 200-400 mesh powder, weigh 2 mg of catalyst and 0.5 mg of conductive carbon black and place them in a 1.5 mL centrifuge tube, add 200 μL of anhydrous methanol or anhydrous ethanol solvent (containing 5% Nafion solution) with a pipette, and ultrasonically disperse in an ultrasonic machine for 1 hour to obtain a black slurry.
[0090] Preparation of working electrode:
[0091] The glassy carbon electrode used was L-shaped and 4 mm in diameter. Before use, the electrode was polished with chamois leather, soaked in dilute nitric acid, and then rinsed with copious amounts of deionized water to obtain a clean surface. Using a pipette, 10 μL of the catalyst ink was dropped onto the glassy carbon electrode, forming a single droplet covering the entire surface. The working electrode was then air-dried for 2 hours.
[0092] 2.CO2RR test and formic acid product analysis
[0093] The CO2RR test was carried out in an H-type electrolytic cell, such as Figure 10 As shown. A three-electrode system is formed by combining the prepared working electrode with a platinum counter electrode and a silver-silver chloride reference electrode. The Ag / AgCl reference electrode used is filled with a saturated KCl solution. In the following, the potential of the working electrode is converted to the potential relative to the reversible hydrogen electrode (VRHE) using the following formula:
[0094] E(vs.RHE)=E(vs.Ag / AgCl)-0.198-0.059×pH
[0095] An H-type electrolytic cell was used, with the working and reference electrodes located on the cathode side of the cell and the counter electrode on the anode side. The electrolyte volume in each cell was 20 mL, and the two cells were separated by a pretreated Nafion 117 proton exchange membrane. The Nafion 117 membrane was pretreated as follows: first, the cut Nafion 117 membrane was treated in a 5% H2O2 aqueous solution at 80°C for 1 hour, then soaked in deionized water for 0.5 hour, then treated in a 5% H2SO4 solution at 80°C for 1 hour, and then soaked in deionized water for 0.5 hour before use.
[0096] Before the test, 99.99% carbon dioxide gas was continuously introduced for 30 minutes. In order to study the selectivity of CO2 electrocatalytic reduction reaction products as a function of applied potential and determine the optimal CO2 electrocatalytic reduction reaction potential, the material was subjected to a 30-minute constant potential chronoamperometric test at different potentials. The gas phase products of CO2RR were analyzed using online gas chromatography. After the reaction, the liquid phase products were analyzed using nuclear magnetic resonance spectroscopy (hydrogen spectrum). Representative spectra are shown below. Figure 11 The results showed that formic acid was the only liquid product.
[0097] Figure 12 、 Figures 13 to 15 The catalytic performance graphs for the electrocatalytic reduction of CO₂ to produce formic acid using the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention and the copper-tin oxide nanomaterials prepared in Comparative Examples 1 to 3 are shown. The comparison shows that the Faradaic efficiency of the amorphous copper-tin oxide nanomaterial prepared in Example 1 of the present invention for the production of formic acid and / or formate from CO₂ is higher than that of the copper-tin oxide nanomaterials prepared in Comparative Examples 1 to 3 for the production of formic acid and / or formate from CO₂.
[0098] In summary, the amorphous copper-tin oxide nanomaterial prepared by the present invention possesses a large number of defect structures and coordinatively unsaturated surface atoms, providing abundant catalytic reaction active sites when used as a catalyst. Furthermore, the introduction of copper not only improves the electrical conductivity of the copper-tin oxide nanomaterial but also promotes the dissociation of H₂O molecules, providing protons for the reduction of CO₂. This enhances the adsorption and activation of CO₂ molecules, as well as the activation of H₂O molecules. This effectively addresses the technical issues of low CO₂RR activity and low formic acid Faradaic efficiency associated with tin-based catalysts.
[0099] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.
Claims
1. A method for preparing an amorphous copper-tin oxide nanomaterial, characterized in that: The following steps are involved: To SnO3 2- Cu was added to the source aqueous solution 2+ The source aqueous solution was stirred at room temperature to obtain amorphous copper tin oxide nanomaterials.
2. The preparation method according to claim 1, characterized in that The SnO3 2- With Cu 2+ The molar ratio is 1:0.8~1.
2.
3. The preparation method according to claim 2, characterized in that The SnO3 2- With Cu 2+ The molar ratio is 1:
1.
4. The preparation method according to claim 1, characterized in that The stirring time at room temperature is 10 min to 60 min.
5. The preparation method according to claim 1, characterized in that The SnO3 2- The source is sodium stannate or potassium stannate.
6. The preparation method according to claim 1, characterized in that The Cu 2+ The source is copper nitrate or copper chloride.
7. The preparation method according to claim 1, characterized in that After stirring at room temperature, a precipitate is obtained, which is washed and dried at 55° C. to 60° C. to obtain an amorphous copper-tin oxide nanomaterial.
8. An amorphous copper-tin oxide nanomaterial, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 7.
9. Use of the amorphous copper-tin oxide nanomaterial according to claim 8 in catalyzing CO2 to produce formic acid and / or formate.