Oxygen reduction electrocatalyst and preparation method thereof

An electrocatalyst and peroxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of expensive fuel cells and reduce H2O2 Yield, low cost, effect of increasing active site density

Active Publication Date: 2013-09-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main problem affecting the large-scale commercialization of fuel cells is that a large amount of platinum catalyst must be used, especially the cathode oxygen reduction reaction, which makes fuel cells very expensive

Method used

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  • Oxygen reduction electrocatalyst and preparation method thereof
  • Oxygen reduction electrocatalyst and preparation method thereof
  • Oxygen reduction electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Carbon black screening: Dissolve 2g of Ketjenblack EC600JD carbon black (KJ600 for short) in 300mL of deionized water, and sonicate for 1h. Pass through a 100-200 mesh sieve, and sonicate again for 1 hour. Mechanical stirring further makes the carbon black evenly dispersed in water. Store at a low temperature of 0-10°C for later use. Thermogravimetric results for carbon black, see Figure 4 , curve 1.

[0064] (2) Grafting of carbon black: weigh 0.1-2.4g p-aminobenzenesulfonic acid (p-NH 2 -Ph-SO 3 H) Powdery solid, add 50-100mL ultra-pure water, under the low temperature condition of 0-10 ℃, slowly add 1M NaOH solution cooled by ice water in advance, dissolve p-aminobenzenesulfonic acid under constant stirring, and obtain p-aminobenzenesulfonic acid Sodium (p-NH 2 -Ph-SO 3 Na). Slowly add 1M HCl solution cooled by ice water dropwise while stirring to obtain milky white p-aminobenzenesulfonic acid (p-NH 2 -Ph-SO 3 H) Suspension, and make the solution acidi...

Embodiment 2

[0077] See Table 1 for specific conditions and results.

[0078] Table 1

[0079]

[0080] The change of the carbon black carrier has a significant effect on the activity and the yield of hydrogen peroxide.

Embodiment 3

[0082] See Table 2 for specific conditions and results.

[0083] Table 2

[0084]

[0085] The amount of aminobenzenesulfonic acid derivatives will affect the effect of wrapping.

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Abstract

The invention relates to an oxygen reduction electrocatalyst and a preparation method thereof and relates to a catalyst. The oxygen reduction electrocatalyst is prepared from the following raw materials: a metal source, a nitrogen source, carbon black, inorganic acid and peroxide, as well as sulfanilic acid, inorganic base and reduced iron powder. One preparation method comprises the following steps of: dissolving the carbon black in water for ultrasonic screening, and carrying out ultrasonic treatment and dispersion treatment; encapsulating the carbon black by a polymer; washing the encapsulated carbon black; adding water and a ferric slat into a dried solid, carrying out rotary evaporation, drying and rough grinding to obtain a powdery solid the ingredient of which is iron doped polymer encapsulated carbon black; carrying out primary thermal treatment; pickling the resulting product; carrying out secondary thermal treatment on the pickled product to obtain the electrocatalyst. Another preparation method comprises the following steps of: dissolving the carbon black in water for ultrasonic screening, and carrying out ultrasonic treatment and dispersion treatment; carrying out carbon black grafting; encapsulating the carbon black by a polymer; washing the encapsulated carbon black; adding water and a ferric slat into a dried solid, carrying out rotary evaporation, drying and rough grinding to obtain a powdery solid the ingredient of which is iron doped polymer encapsulated grafted carbon black; carrying out primary thermal treatment; pickling the resulting product; carrying out secondary thermal treatment on the pickled product to obtain the electrocatalyst. The electrocatalyst is excellent in performance, low in cost, and easy in mass production.

Description

technical field [0001] The invention relates to a catalyst, in particular to an oxygen reduction electrocatalyst and a preparation method thereof. Background technique [0002] Hydrogen energy is known as the ultimate clean energy for mankind. The heat of combustion per kilogram of hydrogen is about three times that of gasoline, and the product of combustion is water, which is the cleanest energy in the world. Hydrogen can be produced from water, the most abundant resource on Earth. Vigorously developing new energy vehicles is a major strategic move to deal with global energy shortages and environmental pollution. Among many new energy vehicles, fuel cell vehicles are considered to be an important direction for the sustainable development of the future automotive industry because of their advantages such as zero emissions, high efficiency, diversified fuel sources, and renewable energy. Ideal scenario for climate change. The U.S. Department of Energy believes that there ...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J31/28
CPCY02E60/50
Inventor 周志有汪强孙世刚陈声培
Owner XIAMEN UNIV
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