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Carbon nitrogen nano fiber loaded platinum ruthenium nano particle electrode catalyst and preparation method

An electrode catalyst, nanoparticle technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as increasing process difficulty, preparation cost, and environmental pollution

Inactive Publication Date: 2008-10-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification processes inevitably increase the process difficulty and preparation cost, and cause environmental pollution

Method used

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  • Carbon nitrogen nano fiber loaded platinum ruthenium nano particle electrode catalyst and preparation method
  • Carbon nitrogen nano fiber loaded platinum ruthenium nano particle electrode catalyst and preparation method
  • Carbon nitrogen nano fiber loaded platinum ruthenium nano particle electrode catalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: 0.1g carbon-nitrogen nanofiber is uniformly dispersed in the ethylene glycol 100% (general 10-100%) solution of 50mL chloroplatinic acid and ruthenium chloride, Pt and Ru content are respectively 0.015g and 0.008g ( The molar ratio is 1:1), stirring for 1-4 hours, jumping the pH to 12-14, then raising the temperature to 100-180°C, reacting for 0.5-5h, filtering, washing, and vacuum-drying at 60°C to obtain platinum ruthenium supported by carbon-nitrogen nanofibers Nanoparticles, denoted as Pt 1.0 Ru 1.0 / CN x . TEM observation ( Figure 4 ), the particle size of the platinum ruthenium nanoparticles is distributed in the range of 1 to 15 nm. Inductively coupled plasma mass spectrometry analysis showed that the loaded nanoparticles were platinum and ruthenium, and the molar ratio of the two was approximately 1:1. Approximate results were obtained when using Pt and Ru contents of 0.0075 g and 0.008 g, respectively (molar ratio 0.5:1).

Embodiment 2

[0019] 1) Evenly disperse 0.1g of carbon-nitrogen nanofibers in 50mL of ethylene glycol solution of chloroplatinic acid, with a Pt content of 0.015g, stir for 1-4h, ultrasonicate for 5-30min, and adjust the pH to 12-14. Then place it in a microwave oven, irradiate at 500W for 200s, filter, wash, and dry to obtain platinum-ruthenium nanoparticles supported by carbon-nitrogen nanofibers, denoted as Pt / CN x . TEM observation ( Figure 5 ), the particle size distribution of platinum nanoparticles is in the range of 1-15nm. High-resolution transmission electron microscope photos ( Image 6 ) and X-ray diffraction spectrum ( Figure 7 ) diffraction peaks indicate that the loaded nanoparticles are platinum nanoparticles. When a single platinum acetate or potassium chlororuthenate is used, or ruthenium particles are the same as above.

[0020] 2) Using the platinum nanoparticles supported by the carbon-nitrogen nanofibers as a catalyst for the catalytic reaction of anodic oxidati...

Embodiment 3

[0021] Embodiment 3: 0.1g carbon-nitrogen nanofiber is uniformly dispersed in the aqueous solution of 50mL chloroplatinic acid and ruthenium chloride, Pt and Ru content are respectively 0.015g and 0.008g (molar ratio is 1: 1), stir 4h, then Slowly add (such as dropwise) the mixed solution of sodium borohydride and sodium hydroxide with a concentration of 0.05mol / L (generally 0.01~0.15mol / L) and 0.01mol / L (generally 0.005~0.03mol / L) respectively until the reaction The pH value of the system is 11 (generally 10-12), and a product similar to Example 1 is obtained after 1 hour of reaction (generally 0.5-3 hours). Approximate results were obtained when using Pt and Ru contents of 0.0075 g and 0.008 g, respectively (molar ratio 0.5:1).

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Abstract

The invention provides an electrode catalyst with carbon-nitrogen nanometer fiber loading platinum-ruthenium nanometer particle. The carbon-nitrogen nanometer fiber is dispersed in solution containing platinum salt and ruthenium salt; a reducing agent is adopted for reduction; the electrode catalyst with carbon-nitrogen nanometer fiber loading platinum-ruthenium nanometer particle is gained after purification; the diameter of the carbon-nitrogen nanometer fiber ranges from 5nm to 300nm; the N / C atomic ratio is 0.01-0.25 and marked as CNx; wherein, x ranges from 0.01 to 0.25; the particle size of the platinum-ruthenium nanometer particle is 0.1-15nm; the proportion of the content (wt%) of the platinum or / and ruthenium nanometer particle and the carbon-nitrogen nanometer fiber mass is 1%-100%:1; the molar ratio of the platinum salt and the ruthenium salt is m:n; wherein, m ranges from 0.5 to1 and n ranges from 0 to1; the used reducing agent is ethylene glycol, sodium borohydride, potassium borohydride or nitrogen.

Description

technical field [0001] The invention relates to a carbon-nitrogen nanofiber-loaded platinum-ruthenium nanoparticle electrode catalyst and a preparation method. Background technique [0002] Proton exchange membrane fuel cells and direct methanol fuel cells are ideal civilian and military portable power sources and electric vehicle marine power sources. Both batteries use carbon-supported platinum-based nanoparticles as electrode catalysts. In order to improve the performance of the fuel cell and reduce the cost, the carbon carrier of the electrode catalyst needs to have the following properties: high stability to prevent the corrosion of carbon and the loss of platinum-based nanoparticles; moderate specific surface area to facilitate the dispersion of platinum-based nanoparticles and Diffusion of reactants; good electrical conductivity to ensure rapid charge transfer; sufficient active sites for immobilizing platinum-based nanoparticles, and achieving high dispersion and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/42B01J23/46B01J35/06H01M4/92
CPCY02E60/50
Inventor 马延文胡征姜淑娟陈懿
Owner NANJING UNIV
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