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Ag@Cu2O core-shell structure nanosphere catalyst as well as preparation method and application thereof

A core-shell structure and nanosphere technology, applied in the field of electrocatalysis, can solve the problems of limited practical application and commercialization, slow electron transfer kinetics, low product selectivity, etc., achieve excellent C2+ selectivity, easy to control the preparation process, The effect of enhancing selectivity

Pending Publication Date: 2022-02-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high reaction overpotential, slow electron transfer kinetics, and low product selectivity limit the practical application and commercialization of copper-based catalyst electrocatalytic reduction of carbon dioxide technology.

Method used

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  • Ag@Cu2O core-shell structure nanosphere catalyst as well as preparation method and application thereof
  • Ag@Cu2O core-shell structure nanosphere catalyst as well as preparation method and application thereof
  • Ag@Cu2O core-shell structure nanosphere catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Provides an Ag@Cu 2 The preparation method of O core-shell structure nanosphere catalyst specifically comprises the following steps:

[0034] 1) Preparation of silver nanosphere inner core

[0035] Weigh 0.5g of PVA and dissolve it in 50ml of deionized water to obtain a 1% PVA aqueous solution, add 16.987mg of AgNO to the 1% PVA aqueous solution 3 And fully stirred at room temperature for 2 hours to ensure that the silver salt and the PVA aqueous solution are fully mixed, and 2ml 30% hydrazine hydrate is added to the above mixed solution to obtain a silver nanosphere dispersion;

[0036] 2) Preparation of Ag@Cu 2 O core-shell nanospheres

[0037] With the silver nanosphere dispersion that step 1) obtains, add 24.16mg Cu (NO 3 ) 2 ·3H 2 O and fully stirred at room temperature for 2 hours to ensure that the copper salt and the silver nanosphere dispersion were fully mixed, and 4ml of 30% hydrazine hydrate reducing agent was added to the above mixture, centrifuged, w...

Embodiment 2

[0044] (Compared with Example 1, we have changed the amount of copper salt added to preparation step 1) PVA aqueous solution concentration, preparation step 2)

[0045] Provides an Ag@Cu 2 The preparation method of O core-shell structure nanosphere catalyst specifically comprises the following steps:

[0046] 1) Preparation of silver nanosphere inner core

[0047] Weigh 1g of PVA and dissolve it in 50ml of deionized water to obtain a 2% PVA aqueous solution, add 16.987mg of AgNO to the 2% PVA aqueous solution 3 And fully stirred at room temperature for 2 hours to ensure that the silver salt and the PVA aqueous solution are fully mixed, and 2ml 30% hydrazine hydrate is added to the above mixed solution to obtain a silver nanosphere dispersion;

[0048] 2) Preparation of Ag@Cu 2 O core-shell nanospheres

[0049] With the silver nanosphere dispersion that step 1) obtains, add 48.32mg Cu (NO 3 ) 2 ·3H 2 O and fully stirred at room temperature for 2 hours to ensure that the ...

Embodiment 3

[0054] (Compared with Example 2, we have changed the amount of copper salt added in preparation step 2))

[0055] Provides an Ag@Cu 2 The preparation method of O core-shell structure nanosphere catalyst specifically comprises the following steps:

[0056] 1) Preparation of silver nanosphere inner core

[0057] With embodiment 2 preparation step 2);

[0058] 2) Preparation of Ag@Cu 2 O core-shell nanospheres

[0059] With the silver nanosphere dispersion that step 1) obtains, add 72.48mg Cu (NO 3 ) 2 ·3H 2 O and fully stirred at room temperature for 2 hours to ensure that the copper salt and the silver nanosphere dispersion were fully mixed, and 4ml of 30% hydrazine hydrate reducing agent was added to the above mixture, centrifuged, washed, and dried to obtain Ag@Cu 2 O core-shell structured nanosphere electrocatalysts.

[0060] Figure 6 Ag@Cu prepared for Example 3 2 The transmission diagram of O core-shell structure nanospheres, it can be seen from the figure that ...

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Abstract

The invention belongs to the technical field of electro-catalysis, and particularly relates to an Ag@Cu2O core-shell structure nanosphere catalyst and a preparation method and application thereof. The catalyst takes silver nanospheres as an inner core and loose porous cuprous oxide as a shell. The preparation method comprises the following steps: 1) dissolving PVA in water to obtain a PVA aqueous solution, adding silver salt into the PVA aqueous solution, fully stirring at normal temperature, and then adding a reducing agent to obtain a silver nanosphere dispersion liquid; and 2) adding copper salt into the silver nanosphere dispersion liquid, fully stirring at normal temperature, adding a reducing agent, centrifuging, washing and drying to obtain the Ag@Cu2O core-shell structure nanosphere electrocatalyst. Synergistic series catalysis between copper and silver catalysts is provided through a core-shell structure, more copper reaction active sites are exposed through coating of a copper shell layer on the surfaces of the silver nanospheres, adsorption of CO intermediates on the active sites is facilitated, C-C coupling is promoted, and the selectivity of the silver nanospheres to multi-carbon products is improved.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to an Ag@Cu 2 O core-shell structure nanosphere catalyst and its preparation method and application. Background technique [0002] Since the industrial revolution, the excessive use of fossil fuels such as coal and oil has caused a sharp increase in the carbon dioxide content in the atmosphere, which makes human beings face the severe challenge of global climate change while on the verge of depletion of fossil fuels. It has become a broad consensus of the international community to reduce greenhouse gas emissions, accelerate the formation of green development methods and lifestyles, and build an ecological civilization and a beautiful earth. China even proposes to strive to peak carbon dioxide emissions by 2030 and strive to achieve carbon neutrality by 2060. [0003] Electrochemical reduction of carbon dioxide, using renewable energy to generate electricity, converts car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/093C25B3/03
CPCC25B11/093C25B3/03
Inventor 于卿杜慧爽张莹许晖李华明
Owner JIANGSU UNIV
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