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Pt-M metal alloy catalyst prepared by electro-deposition in organic system

A metal alloy and catalyst technology, applied in the field of Pt-M metal alloy catalyst and its preparation, can solve the problems of limiting the breakthrough of cathode noble metal catalysts, limited control methods, single synthesis means, etc., and achieve the improvement of comprehensive utilization efficiency and the reduction of platinum loading , The effect of enhanced catalytic activity

Active Publication Date: 2019-07-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, traditional chemical synthesis is limited by single synthesis methods and limited control methods for components and morphology, which greatly limits further breakthroughs in cathodic noble metal catalysts.
The electrochemical synthesis method overcomes the limitations of the above-mentioned traditional chemical synthesis method, and has a very high advantage in controllability, and has been using electrochemical methods to prepare Pt-M with controllable morphology in organic electrolyte systems. There are few reports on the research of alloy catalysts, and they have considerable development prospects

Method used

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  • Pt-M metal alloy catalyst prepared by electro-deposition in organic system
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  • Pt-M metal alloy catalyst prepared by electro-deposition in organic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The preparation steps of the Pt-M metal alloy nanoparticle catalyst with high catalytic performance of the present embodiment are as follows:

[0056] 1. Use an electronic balance to weigh the corresponding reagents according to a certain quality. The Pt source is chloroplatinic acid, the M metal source is cobalt acetylacetonate precursor salt, the supporting electrolyte is potassium perchlorate, and the inert gas N 2 , added to a certain amount of organic solvent DMF, stirred and mixed, and fully stirred evenly;

[0057] 2. Add the above mixed liquid to molecular sieve to remove water;

[0058] 3. Ultrasonic the above reaction product for 3 minutes to disperse evenly;

[0059] 4. Connect the electrochemical device, the electrode is deposited at different deposition potentials from -1.5V to -2.2V (vs. SCE); the scan rate is 25mV / s, and cyclic voltammetry electrochemical cleaning is performed between 0.55V.

[0060] 6. Using constant current electrodeposition method, c...

Embodiment 2

[0066] The preparation steps of the Pt-M metal alloy nanoparticle catalyst with high catalytic performance in this embodiment are the same as those in Example 1, except that:

[0067] 1. Use an electronic balance to weigh the reagent according to a certain quality. The Pt source is chloroplatinic acid, the M metal source is nickel acetylacetonate precursor salt, the supporting electrolyte is potassium perchlorate, and the inert gas N 2 , added to a certain amount of organic solvent DMF, stirred and mixed, and fully stirred evenly;

[0068] 2. Add the above mixed liquid to molecular sieve to remove water;

[0069] 3. Ultrasonic the above reaction product for 3 minutes to disperse evenly;

[0070] 4. Connect the electrochemical device, the electrode is deposited at different deposition potentials from -1.5V to -2.2V (vs. SCE); the scan rate is 25mV / s, and cyclic voltammetry electrochemical cleaning is performed between 0.55V.

[0071] 6. Using constant current electrodepositio...

Embodiment 3

[0077] The preparation steps of the Pt-M metal alloy nanoparticle catalyst with high catalytic performance in this embodiment are the same as those in Example 1, except that:

[0078] 1. Use an electronic balance to weigh the reagent according to a certain quality. The Pt source is chloroplatinic acid, the M metal source is nickel acetylacetonate precursor salt, the supporting electrolyte is tetrabutylammonium chloride, and the inert gas N 2 , added to a certain amount of organic solvent DMF, stirred and mixed, and fully stirred evenly;

[0079] 2. Add the above mixed liquid to molecular sieve to remove water;

[0080] 3. Ultrasonic the above reaction product for 0.5 minutes to disperse evenly;

[0081] 4. Double-click the electrochemical device, the electrode is deposited at different deposition potentials from -1.5V to -2.2V (vs. SCE); the scan rate is 5mV / s, and cyclic voltammetry electrochemical cleaning is performed between 0.3V .

[0082] 6. Using constant current ele...

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Abstract

The invention discloses a Pt-M metal alloy catalyst prepared by electro-deposition in an organic system. A catalyst conductive carrier is carbon-based, and in an organic solvent, Pt-M metal alloy nanoparticles prepared by co-deposition of Pt-M metal are uniformly dispersed on a surface of the carrier by a physical loading mode; during the preparation process, a Pt source precursor and an M sourceprecursor are dissolved in the organic solvent, and the volume mole concentration of the metal precursor in a mixed solution is (1-20)mmol / L; and moreover, oxygen in the solution is discharged under protection of an inertia atmosphere, deposition under subsequent different deposition potentials is performed, and cycle voltammetry electrochemical cleaning is performed. In the catalyst disclosed bythe scheme of the invention, the purposes of further reducing the platinum-loading quantity of the prepared Pt-M metal alloy nanoparticle catalyst, improving the catalytic activity, greatly improvingthe precious comprehensive utilization efficiency, improving the oxygen-reduction performance and reducing comprehensive cost of the precious metal catalyst are achieved.

Description

technical field [0001] The invention relates to the fields of nanomaterials, electrochemical technology and fuel cell catalysts, in particular to a Pt-M metal alloy catalyst prepared by electrodeposition in an organic system and a preparation method thereof. Background technique [0002] Due to the characteristics of high energy conversion efficiency, no environmental pollution, low noise, and good reliability, fuel cells have developed into a new energy technology with great potential. However, there are still many obstacles to the large-scale application of fuel cell technology in the fields of automobiles, distributed power generation, and portable electronics, among which the high cost of cathode catalysts is the most important challenge. Although non-platinum catalysts have great advantages in cost, their catalytic activity and stability are still far behind platinum-based catalysts. As far as the current situation is concerned, the development of new low-platinum high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M12/08B82Y30/00
CPCB82Y30/00H01M4/921H01M4/926H01M12/08Y02E60/10
Inventor 章俊良李凡沈水云范月恒赵路甜郭杨格
Owner SHANGHAI JIAO TONG UNIV
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