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Porous noble metal-based membrane electrode as well as preparation method and application thereof

A precious metal and pore technology, applied in the direction of electrodes, battery electrodes, metal material coating technology, etc., can solve the problems of complicated treatment process, high loss of precious metals, difficulty in removing intermediate reactants, etc.

Pending Publication Date: 2021-05-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned defects in the prior art, the present invention provides a method for preparing a porous noble metal-based membrane electrode based on double-field coupling, which solves the problems of long reaction time, complicated treatment process, Difficult to remove intermediate reactants, high loss of precious metals, poor uniformity, etc.

Method used

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  • Porous noble metal-based membrane electrode as well as preparation method and application thereof
  • Porous noble metal-based membrane electrode as well as preparation method and application thereof
  • Porous noble metal-based membrane electrode as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0058] A. Soak the graphite fiber cloth in 0.5mol / L H at 30°C 2 SO 4 In the solution for 5 minutes, after cleaning and dehydrating with deionized water and absolute ethanol at room temperature, then dry at 50°C for 10 minutes under normal pressure to obtain a pretreated carbonaceous carrier;

[0059] B. Place the carbonaceous carrier obtained in step A in an ion beam sputtering device, heat it to 350°C and keep it warm at 8.0×10 - 3 In the vacuum of Pa, 7.5 sccm of high-purity Ar was introduced, the sputtering screen pressure was controlled to 2.5kV, and the beam current was 70mA. The ion beam sputtered the Pt target containing Ni for 20min, and then naturally cooled to room temperature in the same vacuum degree. Obtain carbon-supported PtNi alloy catalyst;

[0060] C. Immerse the carbon-supported PtNi composite catalyst obtained in step B in an electrolytic cell with a 0.5mol / L HCl solution at 60°C for 60 minutes of electrochemical corrosion; then wash with deionized water...

Embodiment 2

[0064] A. Soak the graphite fiber cloth in 0.8mol / L H at 40°C 2 SO 4 In the solution for 10 minutes, after cleaning and dehydrating with deionized water and absolute ethanol at room temperature, and then drying at 60°C for 20 minutes under normal pressure to obtain a pretreated carbonaceous carrier;

[0065] B. Place the carbonaceous carrier obtained in step A in an ion beam sputtering device, heat it to 250°C and keep it warm at 1.5×10 - 2 In a vacuum of Pa, 8.5 sccm of high-purity Ar is introduced, the sputtering screen pressure is 2.0kV, the beam current is 50mA, the ion beam sputters the Pt target containing Ti for 30min, and then it is naturally cooled to room temperature in the same vacuum degree. Obtain carbon-supported PtTi alloy catalyst;

[0066] C. Immerse the carbon-supported PtTi composite catalyst obtained in step B in an electrolytic cell equipped with a 1.0mol / L HCl solution at 50°C for 90 minutes of electrochemical corrosion, during which the ultrasonic pow...

Embodiment 3

[0070]A. Immerse conductive carbon paper in 1.0mol / L H at 50°C 2 SO 4 In the solution for 5 minutes, after cleaning and dehydrating with deionized water and absolute ethanol at room temperature, then dry at 80°C for 15 minutes under normal pressure to obtain a pretreated carbonaceous carrier;

[0071] B. Place the carbonaceous carrier obtained in step A in an ion beam sputtering device, heat it to 350°C and keep it warm at 1.0×10 - 2 In the vacuum of Pa, 8.0sccm high-purity Ar was introduced, the sputtering screen pressure was controlled to 3.0kV, and the beam current was 100mA. The ion beam sputtered the Pt target containing Ni for 15min, and then cooled naturally to room temperature in the same vacuum degree. Obtain carbon-supported PtNi alloy catalyst;

[0072] C. Immerse the carbon-supported PtNi composite catalyst obtained in step B in an electrolytic cell equipped with a 0.2mol / L HCl solution at 40°C for 30 minutes of electrochemical corrosion, during which the ultras...

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Abstract

The invention provides a porous noble metal-based membrane electrode and a preparation method and application thereof. The method comprises the following steps that noble metal serves as a main catalytic phase, transition metal elements serve as an alloy phase, a noble metal-based membrane catalyst is prepared on the surface of a carbon carrier, dealloying treatment is carried out through the mechanical and electrochemical double-field coupling effect, and the porous noble metal-based membrane electrode is obtained. According to the method for preparing the porous noble metal-based membrane electrode based on the double-field coupling effect, the carbon-loaded noble metal-based catalyst membrane is firstly synthesized and prepared, then the carbon-loaded noble metal-based catalyst membrane is subjected to ultrasonic-assisted electrochemical corrosion, the oxidation precipitation atomic weight of the alloy on the surface of the catalyst is controlled by adjusting the concentration, the temperature, the time and the ultrasonic power density of corrosive liquid so as to obtain an open pore structure, and the electrochemical activity specific surface area of the surface of the membrane electrode can be remarkably increased, so that the porous noble metal-based membrane electrode directly applied to the technical field is prepared. The method has the advantages of short flow, low cost, no intermediate reactant pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of water electrolysis-organic electrocatalytic reduction coupling and the technical field of converting low-carbon oxides into fuels, and specifically relates to a porous noble metal-based membrane electrode prepared based on double-field coupling and its preparation method and application. Background technique [0002] The hydrogenation reaction of organic matter is an important process in the production fields of food, chemical industry, energy, etc., and its combination with electrolysis of water may become the main method of hydrogen production in the future. The reaction conditions are mild, and there is no need to provide additional hydrogen sources; electrochemical reduction of low-carbon oxides (such as CO 2 etc.) can not only store intermittent renewable energy, but also can be converted into important raw materials in chemical fuel production (such as CH 4 etc.), it is extremely important to meet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/18C23C14/46C23C14/58C25F3/02C25F3/06C25F3/08C25B11/081C25B11/065C25B3/26H01M4/88H01M4/92H01M4/96
CPCC23C14/185C23C14/46C23C14/5873C25F3/02C25F3/06C25F3/08H01M4/8871H01M4/96H01M4/921H01M4/926H01M2004/8689Y02E60/50
Inventor 杨滨方留党蔡佳贤封赟昊李旭东
Owner KUNMING UNIV OF SCI & TECH
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