A kind of cathode catalyst for fuel cell and preparation method thereof

A cathode catalyst, fuel cell technology

Active Publication Date: 2016-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, replacing it with expensive Au, the cost is high
The preparation process is required to be carried out in an anhydrous and oxygen-free system, and the operating conditions are very strict; carbonyl compounds are used, which are highly toxic

Method used

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  • A kind of cathode catalyst for fuel cell and preparation method thereof
  • A kind of cathode catalyst for fuel cell and preparation method thereof
  • A kind of cathode catalyst for fuel cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 27mgCuCl respectively 2 2H 2 O and 467mg of hexadecyltrimethylammonium bromide were dissolved in 20ml of deionized water to obtain solution A; high-purity nitrogen gas was introduced into A to saturate for 30 minutes, 120mg of XC72 carbon carrier was added, ultrasonically mixed evenly, and added under vigorous stirring 108 mg KBH 4 , to obtain slurry B; 1ml of PtCl with a concentration of 5.6mgPt / ml 4 Mix the aqueous solution and 117mg of cetyltrimethylammonium bromide in 10ml of deionized water, and stir evenly to obtain solution C; add solution C to the slurry B aged for 4 hours under stirring, and react for 4 hours under the protection of high-purity nitrogen gas; Then add 20ml of isopropanol and stir for 4 hours to obtain slurry D; centrifugally wash slurry D, vacuum dry at 60°C for 10 hours, and grind to obtain solid powder E; 2 / N 2 (Volume ratio 1:5) After the atmosphere was heat treated at 300 degrees for 5 hours, it was treated in a perchloric acid so...

Embodiment 2

[0039] Weigh 54mgCuCl respectively 2 2H 2 O and 1.58g of dodecyltrimethylammonium bromide were dissolved in 40ml of deionized water to obtain solution A; high-purity nitrogen gas was introduced into A for saturation for 30 minutes, 30mg of KB300 carbon carrier was added, ultrasonically mixed evenly, and stirred vigorously Add 250mgKBH 4 , to obtain slurry B; 4.5ml concentration of 5.6mgPt / ml K 2 PtCl 4 Mix the aqueous solution and 395mg of dodecyltrimethylammonium bromide in 10ml of deionized water, and stir evenly to obtain solution C; add solution C to the slurry B aged for 5 hours under stirring, and react for 5 hours under the protection of high-purity nitrogen gas; Then add 30ml of isopropanol, stir for 3 hours to obtain slurry D; centrifugally wash slurry D, dry in vacuum at 60°C for 6 hours, grind to obtain solid powder E; treat in a hydrochloric acid solution with a pH of 1 for 4 hours, filter and wash, After vacuum drying at 60°C for 6 hours, a shell-type Pt / C cat...

Embodiment 3

[0041] Weigh 27mgCuCl respectively 2 2H 2 O and 467mg of hexadecyltrimethylammonium bromide were dissolved in 20ml of deionized water to obtain solution A; high-purity argon gas was passed into A for saturation for 30 minutes, 60mg of XC72 carbon carrier was added, ultrasonically mixed evenly, and added under vigorous stirring 34mgNaBH 4 , to obtain slurry B; 1ml of PtCl with a concentration of 5.6mgPt / ml 4 aqueous solution and 1ml of K at a concentration of 2mgPd / ml 2 PdCl 6 The aqueous solution was mixed in 10ml of deionized water, and stirred evenly to obtain solution C; under stirring, solution C was added to the slurry B aged for 4 hours, and reacted for 4 hours under the protection of high-purity argon; then 20ml of isopropanol was added, and the slurry was obtained after stirring for 4 hours Material D; slurry D was centrifugally washed, dried in vacuum at 60 degrees for 10 hours, and ground to obtain solid powder E; solid powder E was 2 / Ar (volume ratio 1:4) atmo...

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Abstract

The invention relates to a cathode catalyst for a fuel cell and a preparation method thereof. The cathode catalyst is a vacant shell-type carbon-supported Pt-based nano-catalyst. The cathode catalyst comprises Pt or a Pt-transition metal alloy as an active component and has the general formula of Pt or PtMx. In the general formula, M represents Ag, Au, Ru, Rh, Pd, Os or Ir, and x is greater than or equal to 0.05 and less than or equal to 0.95. The cathode catalyst has the particle size of 10-100nm and shell thickness of 1-20nm. The cathode catalyst has high Pt-based component utilization rate. Compared with the conventional carbon-supported Pt-based nano-catalyst, the cathode catalyst is free of a nonreactive Pt-based component in the traditional nano-particle under the premise of effectively retaining a surface-effective Pt-based active component, and improves a Pt-based component utilization rate. The vacant shell structure induces lattice distortion of the Pt-based component so that electron regulation and control effects are obtained and the Pt-based component undergoing the catalytic reaction has high catalytic activity.

Description

technical field [0001] The invention relates to the field of electrocatalysts for fuel cells, in particular to a loaded electrocatalyst and a preparation method thereof, which can be used as a cathode catalyst in proton exchange membrane fuel cells. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy directly into electrical energy. Fuel cells have the advantages of high energy conversion efficiency, easy start-up, and little environmental pollution, and are considered to be one of the best clean energy technologies in the future. Especially proton exchange membrane fuel cells (PEMFCs), because it can be used as a power source for electric vehicles and a portable mobile power source, has been highly valued by governments and enterprises all over the world in recent years. [0003] So far, the most widely used catalyst for PEMFC is Pt / C catalyst. Due to the scarcity and high price of Pt resources, the cost of PEMFC remains ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B01J23/42B01J23/44B01J23/46B01J23/52
CPCH01M4/926Y02E60/50
Inventor 张华民许壮钟和香柳丝丝
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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