Carbon-supported platinum nano-catalyst, preparation method thereof, catalyst layer and proton exchange membrane fuel cell

A nano-catalyst and proton exchange membrane technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of low catalytic efficiency, low production efficiency, and low platinum loading, and achieve high catalytic efficiency and high production efficiency , reduce the effect of reunion

Pending Publication Date: 2021-11-26
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, it is necessary to provide a method for preparing a carbon-supported platinum nanocatalyst that does not use any organic surfactant or complexing agent and can simultaneously achieve high metal loading and high dispersion, so as to solve the problem of existing carbo

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  • Carbon-supported platinum nano-catalyst, preparation method thereof, catalyst layer and proton exchange membrane fuel cell
  • Carbon-supported platinum nano-catalyst, preparation method thereof, catalyst layer and proton exchange membrane fuel cell
  • Carbon-supported platinum nano-catalyst, preparation method thereof, catalyst layer and proton exchange membrane fuel cell

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preparation example Construction

[0049] The preparation method of described carbon-supported platinum nano-catalyst comprises the following steps:

[0050] Step S1: providing a strong base, a chlorine-containing platinum source, a carbon carrier, and water, wherein the molar ratio of the strong base to the chlorine-containing platinum source is 3-10:1;

[0051] Step S2: mixing the strong base, the chlorine-containing platinum source, the carbon carrier, and water to obtain a dispersion, wherein the pH of the dispersion is 11-14;

[0052] Step S3: drying the dispersion to obtain carbon-supported platinum precursor powder; and

[0053] Step S4: placing the carbon-supported platinum precursor powder in a reducing gas, and performing heat treatment to obtain a carbon-supported platinum nanocatalyst, wherein the carbon-supported platinum nanocatalyst includes a carbon support, and uniformly and dispersedly anchored Platinum nanoparticles on the carbon support.

[0054] In at least one embodiment, the chlorine-co...

Embodiment 1

[0110] Provide 1.5mL sodium hydroxide aqueous solution, 1.0mL chloroplatinic acid aqueous solution, and 160mg carbon black, wherein, the concentration of the sodium hydroxide in the described sodium hydroxide aqueous solution is 0.8mol / L, the chlorine in the described chloroplatinic acid aqueous solution The concentration of platinum acid is 0.2mol / L;

[0111] Mixing the sodium hydroxide aqueous solution and the chloroplatinic acid aqueous solution to obtain a precursor aqueous solution with a pH value of 13;

[0112] Carrying out ultrasonic treatment for the first time to described precursor aqueous solution, wherein, the time of described first ultrasonic treatment is 5min;

[0113] Immersing the carbon black in an aqueous precursor solution to obtain a dispersion;

[0114] Mix the dispersion for 30 minutes at a rotational speed of 200 rpm, and then perform a second ultrasonic treatment on the dispersion, wherein the time of the second ultrasonic treatment is 10 minutes;

...

Embodiment 2

[0121] The difference from Example 1 includes: the concentration of sodium hydroxide in the aqueous solution of sodium hydroxide is 0.6mol / L, the pH value of the aqueous precursor solution is 12, and the carbon-supported platinum nanocatalyst of Example 1 is The platinum content is 30%.

[0122] Other steps are the same as in Embodiment 1 and will not be repeated.

[0123] ginseng image 3 and Figure 4 , in the carbon-supported platinum nanocatalyst of Example 2, the platinum nanoparticles are evenly dispersed on the carbon black, and the particle diameter of the platinum nanoparticles is relatively small, about 2-4 nm.

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Abstract

A preparation method of a carbon-supported platinum nano-catalyst comprises the following steps: providing a strong base, a chlorine-containing platinum source, a carbon carrier and water, with the molar ratio of the strong base to the chlorine-containing platinum source being (3-10): 1; mixing the strong base, the chlorine-containing platinum source, the carbon carrier and water to obtain a dispersion liquid with the pH value of 11-14; drying the dispersion liquid to obtain carbon-supported platinum precursor powder; and placing the carbon-supported platinum precursor powder in a reducing gas, and heating to obtain the carbon-supported platinum nano-catalyst. The carbon-supported platinum nano-catalyst comprises a carbon carrier and platinum nano-particles uniformly and dispersedly anchored on the carbon carrier. The invention also provides a carbon-supported platinum nano catalyst, a catalyst layer and a proton exchange membrane fuel cell. The preparation method of the carbon-supported platinum nano-catalyst provided by the invention has the advantages of simple process, low cost, no pollution, high production efficiency, high catalytic efficiency, high platinum loading capacity, clean surface and good platinum nano-particle dispersity.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a carbon-supported platinum nanocatalyst, a preparation method of the carbon-supported platinum nanocatalyst, a catalyst layer using the carbon-supported platinum nanocatalyst, and a proton exchange using the catalyst layer membrane fuel cell. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) uses hydrogen as fuel, and uses electrochemical reactions to directly convert the chemical energy stored in hydrogen and oxygen into electrical energy. It has high energy density, long cruising range, clean environmental protection, and It has outstanding characteristics such as fast start-up at room temperature, and has large-scale application prospects in the automotive field. It is considered to be the most ideal new energy technology in the 21st century. PEMFC includes catalytic layer, proton exchange membrane, gas diffusion layer and bipolar plate, etc. The w...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92H01M8/10
CPCH01M4/8878H01M4/8882H01M4/926H01M8/10Y02E60/50Y02P70/50
Inventor 卢晴晴干林李佳杜鸿达康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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