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Carbon-coated PtPdIr/C oxygen reduction electrocatalyst as well as preparation method and application thereof

An electrocatalyst and carbon-coated technology, which is applied in the fields of energy materials and electrochemistry, can solve problems affecting service life, shedding, agglomeration, etc., and achieve improved heating efficiency, prevention of shedding and agglomeration, high oxygen reduction catalytic activity and stability Effect

Pending Publication Date: 2021-07-20
SHAOYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the technical problems that the fuel cell catalysts in the prior art are prone to fall off and agglomerate in the harsh operating environment of the fuel cell and affect the service life, the purpose of the present invention is to provide a carbon-coated PtPdIr / C oxygen reduction electrocatalyst And its preparation method and application

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  • Carbon-coated PtPdIr/C oxygen reduction electrocatalyst as well as preparation method and application thereof
  • Carbon-coated PtPdIr/C oxygen reduction electrocatalyst as well as preparation method and application thereof

Examples

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Embodiment 1

[0037] Embodiment 1 (comparative example)

[0038] A kind of preparation method of the PtPdIr / C catalyst without carbon coating of the present embodiment, described method specifically comprises the following steps:

[0039] (1) the nano-carbon black ultrasonic dispersion of 50mg is dispersed in deionized water, forms the nano-carbon black dispersion liquid; Chloroplatinic acid (H 2 PtCl 6 ) dissolved in deionized water to form H at a concentration of 0.01M 2 PtCl 6 solution; sodium chloropalladate (Na 2 PdCl 4 ) dissolved in deionized solution to form Na at a concentration of 0.01M 2 PdCl 4 solution; the chloroiridic acid (H 2 IrCl 6 ) dissolved in deionized solution to form H at a concentration of 0.01M 2 IrCl 6 solution; then 3mL of the H 2 PtCl 6 solution, 6mL of the Na 2 PdCl 4 solution, 3mL of the H 2 IrCl 6 The solution is sequentially added to the nano-carbon black dispersion, and ultrasonically mixed evenly to obtain a reaction precursor;

[0040] (2)...

Embodiment 2

[0046] A method for preparing a carbon-coated PtPdIr / C oxygen reduction electrocatalyst of this embodiment, the method specifically includes the following steps:

[0047] (1) the nano-carbon black ultrasonic dispersion of 50mg is dispersed in deionized water, forms the nano-carbon black dispersion liquid; Chloroplatinic acid (H 2 PtCl 6 ) dissolved in deionized water to form H at a concentration of 0.01M 2 PtCl 6 solution; sodium chloropalladate (Na 2 PdCl 4 ) dissolved in deionized solution to form Na at a concentration of 0.01M 2 PdCl 4 solution; the chloroiridic acid (H 2 IrCl 6 ) dissolved in deionized solution to form H at a concentration of 0.01M 2 IrCl 6 solution; then 3mL of the H 2 PtCl 6 solution, 3mL of the Na 2 PdCl 4 solution, 3mL of the H 2 IrCl 6 The solution is sequentially added to the nano-carbon black dispersion, and ultrasonically mixed evenly to obtain a reaction precursor;

[0048] (2) Transfer the reaction precursor obtained in step (1) t...

Embodiment 3

[0054] A method for preparing a carbon-coated PtPdIr / C oxygen reduction electrocatalyst of this embodiment, the method specifically includes the following steps:

[0055] (1) the nano-carbon black ultrasonic dispersion of 50mg is dispersed in deionized water, forms the nano-carbon black dispersion liquid; Chloroplatinic acid (H 2 PtCl 6 ) dissolved in deionized water to form H at a concentration of 0.01M 2 PtCl 6 solution; sodium chloropalladate (Na 2 PdCl 4 ) dissolved in deionized solution to form Na at a concentration of 0.01M 2 PdCl 4 solution; the chloroiridic acid (H 2 IrCl 6 ) dissolved in deionized solution to form H at a concentration of 0.01M 2 IrCl 6 solution; then 3mL of the H 2 PtCl 6 solution, 1.5mL of the Na 2 PdCl 4 solution, 4mL of the H 2 IrCl 6 The solution is sequentially added to the nano-carbon black dispersion, and ultrasonically mixed evenly to obtain a reaction precursor;

[0056] (2) Transfer the reaction precursor obtained in step (1)...

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Abstract

The invention discloses a carbon-coated PtPdIr / C oxygen reduction electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of energy materials and electrochemistry. The preparation method comprises the following steps: firstly, mixing a platinum source solution, a palladium source solution, an iridium source solution and a nano carbon carrier dispersion liquid, carrying out ultrasonic treatment to uniformly disperse the mixture, then transferring an obtained reaction precursor into a microwave high-pressure reaction kettle, carrying out constant-temperature reaction at 150-200 DEG C for 90-150 minutes, cooling to room temperature, centrifuging a sample, washing, and carrying out vacuum freeze drying to obtain the PtPdIr / C catalyst, and carrying out surface carbon coating on the obtained PtPdIr / C catalyst by adopting an electrochemical vapor deposition (CVD) technology to obtain the carbon-coated PtPdIr / C catalyst. The prepared carbon-coated PtPdIr / C catalyst is low in Pt content, the surface-coated carbon layer can effectively prevent Pt-based alloy nanoparticles from being dissolved or agglomerated under the working condition of a fuel cell, and the carbon-coated PtPdIr / C catalyst has high activity and stability.

Description

technical field [0001] The invention belongs to the technical fields of energy materials and electrochemistry, and in particular relates to a carbon-coated PtPdIr / C oxygen reduction electrocatalyst and a preparation method and application thereof. Background technique [0002] Carbon nanomaterials are currently the most widely used support materials for fuel cell catalysts due to their low price, high electrical conductivity, and their surface can provide sufficient loading sites for platinum-based nanoparticles. However, under the cathode operating conditions of proton exchange membrane fuel cells, carbon materials will be severely corroded, and the electrochemical oxidation reaction (COR) of carbon is thermodynamically favorable at potentials higher than 0.2V. When the operating temperature is less than 100 °C and the cell potential is lower than 1.0 V, the COR kinetics are slow; however, if the potential is higher than 1.0 V, the carbon oxidation reaction rate becomes qui...

Claims

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Application Information

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IPC IPC(8): H01M4/92
CPCH01M4/926H01M4/921Y02E60/50
Inventor 邓晓婷尹绍峰
Owner SHAOYANG UNIV
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