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Porous Ag@Cu2O nano cell material, preparation method and application thereof

A nano-cell technology, applied in the fields of materials science and electrochemistry, to suppress the hydrogen evolution reaction

Pending Publication Date: 2021-12-21
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, at greater than 100mA cm -2 Under the total current density of the system, selectivity to methane of more than 50% is rarely reported

Method used

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  • Porous Ag@Cu2O nano cell material, preparation method and application thereof
  • Porous Ag@Cu2O nano cell material, preparation method and application thereof
  • Porous Ag@Cu2O nano cell material, preparation method and application thereof

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preparation example Construction

[0038] The present invention also provides the porous Ag@Cu 2 The preparation method of O nanometer cell material, comprises the following steps:

[0039] (1) Synthetic silver nanocube;

[0040] (2) Preparation of growth solution: disperse the silver nanocubes prepared in step (1) in polyvinylpyrrolidone aqueous solution, stir and mix evenly at high speed, then add copper nitrate trihydrate and ammonium sulfate, and stir to reach equilibrium;

[0041] (3) Porous Ag@Cu 2 The formation of 0 nano-compartment: sodium hydroxide aqueous solution is added dropwise to the growth solution prepared in the step (2), after the dropwise addition, continue to stir, then ascorbic acid is added dropwise in the above-mentioned solution, stop after a certain hour of rapid stirring, Obtain the porous Ag@Cu 2 O nanocompartment material.

[0042] In one embodiment of the present invention, the size of the silver nanocubic particles described in step (1) is 60-80 nm, preferably 68-72 nm, more p...

Embodiment 1

[0057] Preparation of a Porous Ag@Cu for Electrocatalytic Carbon Dioxide Reduction 2 O nano-compartment catalyst material:

[0058] (1) Add 5ml of ethylene glycol (EG) to a 25ml reaction flask in advance, and heat it at 105°C for 10 minutes, then add 250μl of EG solution of 60mM hydrochloric acid;

[0059] (2) After the above solution was stirred for 5 minutes, within 10 seconds, 5ml of 200mM AgNO 3 The EG solution was added thereto. After stirring for another 5 minutes, inject 5 ml of 120 mM polyvinylpyrrolidone (PVP) EG solution within 10 s;

[0060] (3) After the reaction was exposed to the air for 6 hours, the vial was capped and sealed, and the temperature was raised to 140° C. for another 10 minutes. The whole process of mechanical stirring is always kept at 1000rpm to achieve effective gas exchange;

[0061] (4) After the reaction was completed, the reaction was immediately quenched in an ice bath for 20 minutes, and the collected product was washed successively wit...

Embodiment 2

[0070] Preparation of a Porous Ag@Cu for Electrocatalytic Carbon Dioxide Reduction 2 O nano-compartment catalyst material:

[0071] (1) Add 5ml of ethylene glycol (EG) to a 25ml reaction flask in advance, and heat it at 105°C for 10 minutes, then add 250μl of EG solution of 60mM hydrochloric acid;

[0072] (2) After the above solution was stirred for 5 minutes, within 10 seconds, 5ml of 200mM AgNO 3 The EG solution was added thereto. After stirring for another 5 minutes, inject 5 ml of 120 mM polyvinylpyrrolidone (PVP) EG solution within 10 s;

[0073] (3) After the reaction was exposed to the air for 6 hours, the vial was capped and sealed, and the temperature was raised to 140° C. for another 10 minutes. The whole process of mechanical stirring is always kept at 1000rpm to achieve effective gas exchange;

[0074] (4) After the reaction was completed, the reaction was immediately quenched in an ice bath for 20 minutes, and the collected product was washed successively with ...

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Abstract

The invention relates to a porous Ag@Cu2O nano cell material, a preparation method and application thereof. According to the preparation method, firstly, silver nanocubes are synthesized, the silver nanocubes are dispensers in a mixed aqueous solution of copper nitrate and ammonium sulfate. Then precipitator sodium hydroxide is added, and due to the existence of the ammonium sulfate, copper hydroxide in the solution is difficult to self-nucleate and grow, and ammonium ions can reversibly change the copper hydroxide into copper ions again. Silver has a work function lower than that of copper and can serve as a nucleation site of copper hydroxide, so that copper hydroxide microcrystals selectively grow on the surfaces of the silver nanocubes. Then, ascorbic acid is added to reduce microcrystals growing on the surfaces of the silver nanocubes into cuprous oxide microcrystals and amorphous phases, and a target product is obtained after proper curing. The preparation method is environment-friendly, the preparation process is simple and easy to operate, and industrial production is facilitated; and the obtained product can effectively improve methane selectivity and current density in the electro-catalysis process, and has wide application prospects in the electro-catalysis field.

Description

technical field [0001] The invention belongs to the field of material science and electrochemical technology, in particular to a porous Ag@Cu 2 O nanocompartment material and its preparation method and application. Background technique [0002] Electroreduction of carbon dioxide (CO2) driven by renewable energy 2 RR) is the CO 2 A promising strategy for conversion to carbon-neutral fuels and commodity chemicals. According to current literature reports, CO 2 There are various products from C1 to C3 in RR. However, CO 2 RR techno-economic analysis shows that commercial CO 2 The RR system requires the working current density to be much higher than 100mA cm -2 can be economically viable, however at greater than 100mA cm -2 Requirements, only carbon monoxide (CO) with considerable selectivity Formic acid (FE>80%) and ethylene (70% FE). [0003] Methane is CO 2 The simplest hydrocarbon product in RR is also a widely used fuel and chemical feedstock. However, methane h...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F1/00C25B11/093B82Y30/00B82Y40/00C25B1/23C25B3/03C25B3/26
CPCC25B11/093B82Y30/00B82Y40/00C25B1/23C25B3/03C25B3/26
Inventor 熊力堃张文轩韩生
Owner SHANGHAI INST OF TECH
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