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Preparation method and application of self-supporting Pd-Ag-Ni ternary metal catalyst

A ternary metal and catalyst technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve problems such as expensive equipment and non-compliance, and achieve the effect of simple operation, few steps, and good application prospects

Inactive Publication Date: 2017-01-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They either require reducing agents and auxiliary agents, or require external heat sources, or require expensive equipment, which do not meet the requirements of the currently advocated green synthesis

Method used

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  • Preparation method and application of self-supporting Pd-Ag-Ni ternary metal catalyst
  • Preparation method and application of self-supporting Pd-Ag-Ni ternary metal catalyst
  • Preparation method and application of self-supporting Pd-Ag-Ni ternary metal catalyst

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Experimental program
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Effect test

Embodiment 1

[0035] 1. Preparation of self-supporting Pd-Ag-Ni ternary metal catalyst (A)

[0036] The commercialized nickel foam was washed with acetone, 1mol / L HCl solution and ultrapure water in turn, and then used; the purified nickel foam was immersed in a solution containing 20mmol / L AgNO 3 In the solution of the precursor, take it out after standing for 10min, rinse it with enough ultrapure water for 3 times, dry it, and set aside; soak the Ag-substituted nickel foam in the solution containing 25mmol / L K 2 PdCl 4 In the solution of the precursor, take it out after standing for 5 minutes, rinse with sufficient ultrapure water for 3 times, dry at room temperature for 30 minutes, and set aside.

[0037] figure 1 It is a flow chart for the preparation of the Pd-Ag-Ni ternary metal catalyst proposed by the present invention. Using commercial porous nickel foam as a self-supporting substrate, the Ni and Ag + Replacement occurs, and then let the generated Ag and [PdCl 4 ] 2- A partia...

Embodiment 2

[0044] 1. Preparation of self-supporting Pd-Ag-Ni ternary metal catalyst (B)

[0045] The commercialized nickel foam was washed with acetone, 1mol / L HCl solution and ultrapure water in turn, and then used; the purified nickel foam was immersed in a solution containing 20mmol / L AgNO 3 In the solution of the precursor, take it out after standing for 10min, rinse it with enough ultrapure water for 3 times, dry it, and set aside; soak the Ag-substituted nickel foam in the solution containing 25mmol / L K 2 PdCl 4 In the solution of the precursor, take it out after standing for 2 minutes, rinse with sufficient ultrapure water for 3 times, dry at room temperature for 30 minutes, and set aside. As determined by ICP-OES, the atomic ratio of Pd to Ag on the Ni surface is 24:76, denoted as Pd 0.24 -Ag 0.76 -Ni.

[0046] 2. Electrocatalytic oxidation of methanol in alkaline environment

[0047] Self-supporting Pd prepared by 0.24 -Ag 0.76 -Ni ternary metal catalyst directly as the w...

Embodiment 3

[0049] 1. Preparation of self-supporting Pd-Ag-Ni ternary metal catalyst (C)

[0050] The commercialized nickel foam was washed with acetone, 1mol / L HCl solution and ultrapure water in turn, and then used; the purified nickel foam was immersed in a solution containing 20mmol / L AgNO 3 In the solution of the precursor, take it out after standing for 10min, rinse it with enough ultrapure water for 3 times, dry it, and set aside; soak the Ag-substituted nickel foam in the solution containing 25mmol / L K 2 PdCl 4 In the solution of the precursor, take it out after standing for 10 minutes, rinse it with enough ultrapure water for 3 times, dry it at room temperature for 30 minutes, and set it aside. As determined by ICP-OES, the atomic ratio of Pd to Ag on the Ni surface is 72:28, denoted as Pd 0.72 -Ag 0.28 -Ni.

[0051] 2. Electrocatalytic oxidation of methanol in alkaline environment

[0052] Self-supporting Pd prepared by 0.72 -Ag 0.28 -Ni ternary metal catalyst directly as...

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Abstract

The invention provides a preparation method and application of a self-supporting Pd-Ag-Ni ternary metal catalyst. The preparation method comprises the following steps: step 1, pretreating nickel foam; step 2, taking the pretreated nickel foam as a substrate, immersing the pretreated nickel foam into an AgNO3 precursor solution, enabling metal Ni and Ag+ to carry out galvanic substitution, forming a metal Ag layer on the surface of foam Ni to obtain Ag substituted nickel foam, cleaning with ultra-pure water, and drying for subsequent use; and step 3, taking out the Ag substituted nickel foam, immersing the Ag substituted nickel foam in a K2PdCl4 precursor solution, enabling metal Ag on the nickel foam in the step 2 and [PdCl4] 2- to carry out partial galvanic substitution, taking out, cleaning with ultra-pure water, and drying to obtain the self-supporting Pd-Ag-Ni ternary metal catalyst. The prepared self-supporting Pd-Ag-Ni ternary metal catalyst has excellent activity to electrocatalytic oxidation of methanol in an alkaline environment, and has good application prospect in the field of low-temperature methanol fuel batteries.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method and application of a self-supporting Pd-Ag-Ni ternary metal catalyst. Background technique [0002] Noble metal catalysts have good acid and alkali resistance, and have been widely used in electrochemical reactions such as oxidation of small molecule alcohols, oxygen reduction, and hydrogen dissolution. Compared with traditional platinum-based catalysts, palladium-based catalysts are richer in resources, relatively lower in cost, and have better activity in the electrocatalytic oxidation of small molecule alcohols. Therefore, in the field of developing low-temperature alcohol fuel cells with high energy conversion efficiency It has great application prospect. [0003] The performance of a catalyst is closely related to its surface chemical composition. Noble metal-based catalysts containing multiple components often exhibit better c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92
CPCH01M4/921Y02E60/50
Inventor 牛湘衡李欣张文驰潘建明何艳芳邱凤仙
Owner JIANGSU UNIV
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