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Method for regulating and controlling structure of carbon-supported PtCu3 alloy catalyst

An alloy catalyst, carbon-supported technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as lack of regulation

Pending Publication Date: 2022-06-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems such as the lack of regulation and control of the crystal phase structure of Pt-Cu alloy nanoparticles in the prior art, and provides a method of regulating and controlling the carbon-loaded PtCu 3 Alloy catalyst structure method, that is, by adding PtCu nanoparticles in N 2 Gas or N 2 / H 2 Heat treatment in mixed gas atmosphere for different time to achieve PtCu 3 The crystalline phase of the disordered PtCu 3 Alloy - Ordered PtCu 3 Alloy regulation and regulation to generate Pt-rich surface and Pt-poor interior structure

Method used

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  • Method for regulating and controlling structure of carbon-supported PtCu3 alloy catalyst
  • Method for regulating and controlling structure of carbon-supported PtCu3 alloy catalyst
  • Method for regulating and controlling structure of carbon-supported PtCu3 alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: a kind of regulation carbon-supported PtCu 3 The method of alloy catalyst structure, the concrete steps are as follows:

[0027] (1) Add Pt / C powder to Cu(NO 3 ) 2 Mix evenly in the aqueous solution, ultrasonic immersion for 30min to obtain a mixed solution; Pt accounts for 20wt.% in the Pt / C powder, C is single-layer graphene, Cu(NO 3 ) 2 The concentration of the aqueous solution is 0.2mol / L, and the Pt and Cu(NO) in the Pt / C powder 3 ) 2 The molar ratio of Cu in is 1:3;

[0028] (2) using liquid nitrogen to freeze the mixed solution obtained in step (1) for 72h to obtain a mixed solid; wherein the air pressure of the freezing treatment is 27MPa, and the temperature is -43°C;

[0029] (3) the mixed solid obtained in step (2) is placed in N 2 The temperature was uniformly heated to 800 °C in the air and heat treated at a constant temperature for 30 min, 60 min and 90 min respectively. 2 Cooled to room temperature in air to obtain PtCu on carbon 3 ...

Embodiment 2

[0032] Embodiment 2: a kind of regulation carbon-supported PtCu 3 The method of alloy catalyst structure, the concrete steps are as follows:

[0033] (1) Add Pt / C powder to CuCl 2 Mix evenly in the aqueous solution, ultrasonic immersion for 40min to obtain a mixed solution; in which Pt accounts for 20wt.% in the Pt / C powder, C is a multi-walled carbon nanotube with a diameter of 5-100nm, CuCl 2 The concentration of the aqueous solution is 0.2mol / L, and the Pt and CuCl in the Pt / C powder 2 The molar ratio of Cu in is 1:3;

[0034] (2) The mixed solution obtained in step (1) is subjected to freezing treatment for 72h to obtain a mixed solid; wherein the air pressure of the freezing treatment is 30MPa, and the temperature is -40°C;

[0035] (3) the mixed solid obtained in step (2) is placed in N 2 The temperature was increased to 800 °C at a constant rate in the air and heat treated at a constant temperature for 60 min. 2 Cooled to room temperature in air to obtain PtCu on c...

Embodiment 3

[0037] Embodiment 3: a kind of regulation carbon-supported PtCu 3 The method of alloy catalyst structure, the concrete steps are as follows:

[0038] (1) Add Pt / C powder to CuCl 2 The aqueous solution was mixed uniformly, and the mixed solution was obtained by ultrasonic immersion for 60min; in which Pt accounted for 20wt.% in the Pt / C powder, C was nanoporous carbon, and CuCl 2 The concentration of the aqueous solution is 0.2mol / L, and the Pt and CuCl in the Pt / C powder 2 The molar ratio of Cu in is 1:3;

[0039] (2) freezing the mixed solution obtained in step (1) for 75h to obtain a mixed solid; wherein the air pressure of the freezing treatment is 33MPa, and the temperature is -33°C;

[0040] (3) the mixed solid obtained in step (2) is placed in N 2 The temperature was uniformly heated to 800 °C in the air and heat treated at a constant temperature for 30 min, 60 min and 90 min respectively. 2 Cooled to room temperature in air to obtain PtCu on carbon 3 alloy catalys...

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Abstract

The invention relates to a method for regulating and controlling the structure of a carbon-supported PtCu3 alloy catalyst, and belongs to the technical field of carbon-supported PtCu3 alloy catalysts. The preparation method comprises the following steps: adding Pt / C powder into a copper salt aqueous solution, uniformly mixing, and carrying out ultrasonic impregnation for 30-60 minutes to obtain a mixed solution; freezing the mixed solution to obtain a mixed solid; and placing the mixed solid in N2 gas or N2 / H2 mixed gas, heating to 800-1000 DEG C at a constant speed, carrying out constant-temperature heat treatment, and cooling to room temperature in the N2 gas atmosphere to obtain the carbon-supported PtCu3 alloy catalyst with an ordered and / or disordered structure, thereby realizing regulation and control of the structure of the carbon-supported PtCu3 alloy catalyst. According to the method, the PtCu nanoparticles are subjected to heat treatment in the atmosphere of N2 gas or N2 / H2 mixed gas for different times, so that regulation and control of disordered PtCu3 alloy-ordered PtCu3 alloy of a crystal phase of PtCu3 are achieved, and a structure with the surface rich in Pt and the interior poor in Pt is generated through regulation and control.

Description

technical field [0001] The present invention relates to a kind of regulating carbon-supported PtCu 3 Method for alloy catalyst structure, belonging to carbon-supported PtCu 3 The technical field of alloy catalysts. Background technique [0002] The anode and cathode catalysts of proton exchange membrane fuel cells (PEMFCs) usually employ platinum (Pt)-based catalysts, in which the reaction rate of cathode oxygen reduction reaction (ORR) is much slower than that of anode hydrogen oxidation (HOR), requiring more of platinum (Pt) to promote the cathodic reaction. However, Pt resources are scarce and expensive, resulting in high cost of Pt-based catalysts. The preparation of Pt-M alloy catalysts by alloying Pt with 3d transition metals (such as: M=Fe, Co, Cu and Ni, etc.) can reduce the cost, and at the same time control the size, morphology and crystal phase of Pt-based alloy nanoparticles structure to improve the ORR activity and stability of the catalyst. [0003] Ordere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/88H01M4/926Y02E60/50
Inventor 杨喜昆韩馥旭
Owner KUNMING UNIV OF SCI & TECH
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