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Metal particle-amorphous diamond composite anode for fuel cell and preparation method thereof

A technology of amorphous diamond and metal particles, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that hinder the use of amorphous diamond films, poor conductivity of amorphous diamond films, and low catalytic activity of films, and achieve long-term catalytic ability Stable, good chemical stability, excellent anti-adsorption ability

Inactive Publication Date: 2012-07-18
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amorphous diamond film prepared by physical vapor deposition technology has poor conductivity, and the resistivity is as high as 10. 7 ~10 8 Ωcm, the catalytic activity of the film is low, which hinders the use of amorphous diamond film as a fuel cell anode material

Method used

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  • Metal particle-amorphous diamond composite anode for fuel cell and preparation method thereof
  • Metal particle-amorphous diamond composite anode for fuel cell and preparation method thereof
  • Metal particle-amorphous diamond composite anode for fuel cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The platinum metal particle-phosphorus-doped amorphous diamond composite anode of this embodiment can be obtained through the following steps:

[0036] (1) Put the high-purity carbon target and the substrate after ultrasonic cleaning into the vacuum chamber of the filtered cathodic vacuum arc system, and use argon ions to etch the substrate surface for 10 minutes to remove the oxide layer on the substrate surface;

[0037] (2) Pass into working gas in vacuum chamber, and this working gas contains phosphine 10sccm, argon 10sccm;

[0038] (3) Use the graphite cathode to excite the discharge of the high-purity carbon target to generate carbon plasma. The carbon plasma bombards the phosphine gas in the vacuum chamber under the action of the -200V pulsed negative bias accelerating electric field to ionize it, and the generated carbon, phosphorus, and hydrogen The mixed plasma is deposited together on the substrate to form phosphorus-doped amorphous diamond film;

[0039] (4...

Embodiment 2

[0043] The difference between this example and Example 1 is that, during the preparation process of the platinum metal particles-phosphorus-doped amorphous diamond composite anode, the working gas fed into the vacuum chamber is 30 sccm, including 20 sccm of phosphine and 10 sccm of argon. Through the secondary ion mass spectrometry test, the platinum nanoparticle-phosphorus-doped amorphous diamond composite anode of the present embodiment is composed of 63.3% carbon, 5.8% phosphorus, 8.8% oxygen, 13.6% hydrogen and 8.5% by mass percentage. % platinum composition. Increasing the flow rate of phosphine in the working gas can increase the phosphorus content in the phosphorus-doped amorphous diamond film, and further improve the conductivity of the film. The deposition amount of platinum nanoparticles on the surface of phosphorus-doped amorphous diamond film also increased correspondingly. The diameter of platinum nanoparticles varied in the range of 6.5-39.4nm, mainly distributed...

Embodiment 3

[0046] The difference between this example and example 1 is that during the preparation process of the platinum metal particles-phosphorus-doped amorphous diamond composite anode, the working gas is 10 sccm of phosphine and 0 sccm of argon gas into the vacuum chamber; The deposition potential of electroplated platinum metal particles on the phosphorus amorphous diamond film is -0.6V, and the deposition time is 20s. According to the secondary ion mass spectrometry test, the composite anode of this embodiment is made of 58.7% carbon, 6.3% phosphorus, 9.3% oxygen, 14.0% hydrogen and 11.7% platinum in terms of mass percentage. The diameter of platinum nanoparticles varies in the range of 5.8-38.9nm, mainly distributed in the range of 8-15nm, and the particle density is 1.3×10 12 piece / cm 2 . This shows that the more negative the deposition potential, the more favorable the deposition of platinum nanoparticles on the surface of phosphorus-doped amorphous diamond film, and the gre...

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Abstract

The invention discloses a metal particle-amorphous diamond composite anode for a fuel cell and a preparation method thereof. In the anode, a doped amorphous diamond film and metal nanoparticles are deposited on a substrate of the anode in sequence from bottom to top, wherein the doped amorphous diamond film contains carbon, hydrogen, oxygen and a current carrier doping agent; the current carrier doping agent is any one of boron, nitrogen or phosphorus; the metal nanoparticles are any one or any more than two alloys of platinum, ruthenium or palladium; and the composite anode comprises the following components in percentage by mass: 58.7 to 77.5 percent of carbon, 0 to 14.0 percent of hydrogen, 6.4 to 15.3 percent of oxygen, 1.7 to 8.5 percent of current carrier doping agent, and 3.2 to 13.4 percent of metal nanoparticles. The metal particle-amorphous diamond composite anode has simple preparation technology, can be used as an anode material of alcohol fuel cells, and has good catalytic capability.

Description

technical field [0001] The invention relates to an anode for a fuel cell and a preparation method thereof. Background technique [0002] Fuel cells have become an ideal power source for portable electronic devices and electric vehicles due to their abundant fuel sources, simple structure, adjustable volume and mass, convenient storage, and environmental friendliness. At present, alcohol fuel cells working at room temperature usually use noble metals, such as Pt / C particles, as catalysts, and use methanol and ethanol as fuels to directly convert chemical energy into electrical energy. However, the preparation process of Pt / C catalysts is complicated, and usually involves washing, filtering, drying, heat treatment, repeated pH adjustment, etc., the process is difficult to control, and the preparation cycle is long. Harmful reducing agents such as formaldehyde are also used in the preparation process, causing a certain degree of pollution to the environment. In addition, alco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88
CPCY02E60/50
Inventor 刘爱萍唐为华李超荣姜平
Owner ZHEJIANG SCI-TECH UNIV
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