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Phosphorus-nickel-palladium co-doped carbon-based composite catalyst and preparation method and application thereof

A composite catalyst and co-doping technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of difficult large-scale commercial application, limited reserves, and expensive Pt catalysts, and achieve excellent electrocatalytic performance, The effect of low price and abundant raw materials

Active Publication Date: 2019-02-01
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pt catalysts used to catalyze the oxygen reduction reaction (ORR) at the cathode of fuel cells are expensive and have limited reserves, so it is difficult to carry out large-scale commercial applications

Method used

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  • Phosphorus-nickel-palladium co-doped carbon-based composite catalyst and preparation method and application thereof
  • Phosphorus-nickel-palladium co-doped carbon-based composite catalyst and preparation method and application thereof
  • Phosphorus-nickel-palladium co-doped carbon-based composite catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Preparation of dimethylglyoxime nickel / palladium

[0083] (1) Weigh about 20.7 mg (±1 mg) of potassium tetrachloropalladate and 150 mg of nickel sulfate and dissolve them in 400 mL of tertiary water, and place them on a magnetic stirrer to fully stir to obtain a light green transparent solution.

[0084] (2) Weigh about 146 mg (±1 mg) of dimethylglyoxime and dissolve it in 12 mL of ethanol, ultrasonically dissolve it quickly, and add NaOH dropwise to adjust to pH=9-10.

[0085] (3) Under the stirring of a magnetic stirrer, the dimethylglyoxime solution was added dropwise to the solution, and a red precipitate was formed rapidly.

[0086] (4) The red precipitate was separated by suction filtration, washed three times with distilled water and ethanol respectively, and finally placed in an oven at 80°C for drying for 12 hours to obtain a red product, which was marked as dimethylglyoxime nickel / palladium such as figure 1 shown.

Embodiment 2

[0088] Using the dimethylglyoxime nickel / palladium obtained in Example 1 as a precursor, the catalyst of the present invention was prepared

Embodiment 3

[0105] Comparing the catalytic performance of catalysts with different compositions

[0106] Disperse 2 mg of the catalysts obtained in Example 2, Comparative Example 1 and Comparative Example 2 into a mixed solution of 800 μL of water and 200 μL of isopropanol respectively, and ultrasonically disperse them uniformly to obtain 2 mg mL of -1 catalyst dispersion. When studying the catalytic performance, it is necessary to first drop 15 μL (dropwise three times, 5 μL each time) of the three catalysts obtained in this patent onto the RDE electrode (S=0.1256cm). 2 ), after being completely dried, 2 μL of 0.5% Nafion solution was finally added dropwise, and its ORR electrocatalytic performance was measured on a CHI 832B electrochemical workstation. For the above electrocatalytic performance tests, Ag / AgCl (3M NaCl) electrode was used as the reference electrode, Pt wire electrode (diameter 0.5mm) was used as the counter electrode, the scan rate was 10mV / s, and the electrolyte was 0.1M...

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Abstract

The invention belongs to the technical field of new energy materials and relates to a phosphorus-nickel-palladium co-doped carbon-based composite catalyst and a preparation method and application thereof. A preparation process includes steps: subjecting metal salt and dimethylglyoxime to reaction to obtain a precursor being one of dimethylglyoxime nickel, dimethylglyoxime palladium or palladium-doped dimethylglyoxime nickel, wherein the metal salt refers to bivalent nickel or palladate; decomposing sodium hypophosphite to obtain hydrogen phosphide and phosphate, and subjecting a product obtained through direct chemical reaction of hydrogen phosphide and the precursor to chemical reaction to acid soaking to obtain the phosphorus-nickel-palladium co-doped carbon-based composite catalyst. Thecatalyst has excellent catalytic performances and is effective in an electro-catalysis process; under the joint action of phosphorus-nickel-palladium co-doping, better effects than those of nickel-phosphorus doping and palladium-phosphorus doping are achieved; in cathodic oxygen reduction reaction in an ORR electro-catalysis process, high electron transfer quantity, low hydrogen peroxide yield, high catalyst stability and excellent methanol tolerance are realized.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, in particular to a phosphorus-nickel-palladium co-doped carbon-based composite non-platinum catalyst using dimethylglyoxime nickel / palladium as a precursor, and also relates to a preparation method of the catalyst and its use in alkali Application of Electrocatalytic Oxygen Reduction Reaction in Natural Electrolytes Background technique [0002] With the increasingly severe world energy crisis, the development of clean, efficient and sustainable energy has become an urgent task. In recent years, fuel cells have gradually shown their importance due to their high efficiency and environmental friendliness. Pt catalysts for catalyzing the oxygen reduction reaction (ORR) at the cathode of fuel cells are expensive and have limited reserves, so large-scale commercial applications are difficult. Therefore, in order to improve the competitiveness of fuel cells, we must first reduce their co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/96
CPCH01M4/8647H01M4/96Y02E60/50
Inventor 李海波董雪
Owner LIAOCHENG UNIV
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