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Method for preparing proton-exchange membrane fuel cell oxygen reduction catalyst based on PtNi (111) octahedral single crystal nanoparticles

A proton exchange membrane, fuel cell technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Shortening lattice spacing, avoiding agglomeration, and good monodispersity

Inactive Publication Date: 2015-10-28
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on Pt-based bimetallic oxygen reduction catalysts mainly focuses on alloys and spherical nanoparticles with core-shell structure. Although the catalytic activity of Pt / C catalysts has improved, it is far from meeting the requirements of commercialization.

Method used

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  • Method for preparing proton-exchange membrane fuel cell oxygen reduction catalyst based on PtNi (111) octahedral single crystal nanoparticles
  • Method for preparing proton-exchange membrane fuel cell oxygen reduction catalyst based on PtNi (111) octahedral single crystal nanoparticles
  • Method for preparing proton-exchange membrane fuel cell oxygen reduction catalyst based on PtNi (111) octahedral single crystal nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Example 1: Weigh 39.3 mg of platinum acetylacetonate and 77.1 mg of nickel acetylacetonate, and put them into 50 mL of N,N-dimethylformamide to fully dissolve, wherein the atomic ratio of Pt:Ni is 1:3. The mixture was placed in an autoclave, heated in an oven at 120°C for 42 hours, the resulting solution was cooled to room temperature and then 50 mL of n-hexane was added, ultrasonicated for 3 hours and the temperature of the water bath was controlled not to exceed 30°C. Then the above-mentioned highly dispersed sol was added dropwise to the 28.2 mg conductive carbon black solution in the form of back titration, after stirring for 48 hours, static filtration, and alternate cleaning with deionized water and ethanol, and finally placed in a vacuum oven at 60 °C for 6 hours. The catalytic oxidation source (ORR) activity value of this product is about 1.50A / mg.

Embodiment 2

[0026] Example 2: Weigh 39.3 mg of platinum acetylacetonate and 51.4 mg of nickel acetylacetonate, and put them into 37.5 mL of N,N-dimethylformamide to fully dissolve, wherein the atomic ratio of Pt:Ni is 1:2. The mixture was placed in an autoclave, heated in an oven at 120°C for 42 hours, the resulting solution was cooled to room temperature and then 25 mL of n-hexane was added, ultrasonicated for 3 hours and the temperature of the water bath was controlled not to exceed 30°C. Then the above-mentioned highly dispersed sol was added dropwise to 34.0 mg conductive carbon black solution in the form of back titration, stirred for 48 hours, statically filtered, and the resulting product was washed alternately with deionized water and ethanol, and finally placed in a vacuum oven at 60 °C for 6 hours. The resulting product had an oxidative origin (ORR) activity of about 0.95 A / mg.

Embodiment 3

[0027] Example 3: 39.3 mg of platinum acetylacetonate and 25.7 mg of nickel acetylacetonate were weighed and put into 25 mL of N,N-dimethylformamide to fully dissolve, wherein the atomic ratio of Pt:Ni was 1:1. The mixture was placed in an autoclave, heated in an oven at 120°C for 42 hours, the resulting solution was cooled to room temperature and then 50 mL of n-hexane was added, ultrasonicated for 3 hours and the temperature of the water bath was controlled not to exceed 30°C. Then the above-mentioned highly dispersed sol was added dropwise to 40.0 mg conductive carbon black solution in the form of back titration, stirred for 48 hours, filtered statically, and the resulting product was washed alternately with deionized water and ethanol, and finally placed in a vacuum oven at 60 °C for 6 hours. The resulting product had an oxidative origin (ORR) activity of approximately 0.7 A / mg.

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Abstract

The invention discloses a method for preparing a proton-exchange membrane fuel cell oxygen reduction catalyst based on PtNi (111) octahedral single crystal nanoparticles, which mainly solves the problem in the prior art that a conventional single-Pt catalyst or a Pt-based catalyst based on bimetallic spherical core-shell-structured nanoparticles is low in activity and poor in Pt atomic efficiency. Meanwhile, the influence factor and the synthesis optimization condition for morphology-controlled PtNi (111) octahedral single crystal nanoparticles are obtained. According to the technical scheme of the invention, platinum acetylacetonate and nickel acetylacetonate are adopted as metal salt precursors, and N, N-dimethylformamide (DMF) is adopted as a crystal face growth control agent. Through the heating reduction process, morphology-controlled PtNi (111) octahedral single crystal nanoparticles are obtained. The morphology-controlled PtNi (111) octahedral single crystal nanoparticles are subjected to ultrasonic dispersion in n-hexane, and then the well dispersed sol is slowly added onto the conductive carbon black of high specific surface area drop by drop through the residual titration process. Therefore, the electro-catalysis specific activity of the obtained oxygen reduction catalyst is high up to 1.5 A / mg Pt, and is improved by 9-10 times compared with that of conventional commercial Pt / C catalysts.

Description

technical field [0001] The invention relates to a method for preparing a proton exchange membrane fuel cell cathode oxidation procatalyst. The PtNi(111) nano single crystal octahedral bimetallic fuel cell catalyst prepared by the method has high oxygen reduction activity, reduces the Pt content and increases the Pt atom utilization rate. Background technique [0002] The limitedness and non-renewability of fossil fuels and the pollution caused by their combustion are becoming more and more serious. As a clean energy alternative, hydrogen energy proton exchange membrane fuel cell technology has outstanding advantages such as zero pollution and high energy power. According to the prediction of authoritative experts, PEMFC will usher in a blowout development in the automotive field within 5 to 10 years: 2016 to 2020 is the market introduction period of PEMFC automobiles, and its large-scale commercialization will be realized after 2020. The potential commercialization of this f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 刘锋段骁赵云昆顾永万栗云彦胡晋铨杨冬霞贺小昆桓源峰
Owner 昆明贵研催化剂有限责任公司
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