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Composite anode electrocatalyst for direct methanol fuel cell

A technology for methanol fuel cells and electrocatalysts, applied in battery electrodes, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. The impact of catalyst performance and other issues, to achieve the effect of simple preparation process, improve anti-poisoning performance, and reduce anode polarization

Inactive Publication Date: 2008-11-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this technology is cumbersome, and heat treatment is required at the end, and the influence of metal oxide crystal structure on catalyst performance is not investigated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepared catalyst, its component and percentage by weight are: Pt 20%, M 1-X N X o 2 17.5%, C 62.5%. Wherein M is Ce, N is Sr, and x is 0.02.

[0015] The specific method is: dissolve 8.406 grams of citric acid in 30 grams of water, then add 10 grams of ethylene glycol, place it on a magnetic stirrer and stir it fully for 1 hour, then add 4.256 grams of cerium nitrate and 0.042 grams of strontium nitrate, and heat to volatilize Remove moisture. The gel-like crystal precursor obtained after volatile moisture was placed in a high-temperature furnace, heated at a heating rate of 5°C / min in an air atmosphere, and fired at a constant temperature of 500°C for 180min, and then naturally cooled to room temperature to obtain a particle size of 5 Pale yellow Ce between -15nm 0.98 Sr 0.02 o 2 powder. Will Ce 0.98 Sr 0.02 o 2 After mixing the powder and C according to the mass ratio of 1:3.570, adding deionized water, stirring, filtering and drying to obtain the carrier....

Embodiment 2

[0017] Prepared catalyst, its component and percentage by weight are: Pt 20%, M 1-X N X o 2 17.3%, C 62.7%. Wherein M is Ce, N is Sr, and x is 0.05.

[0018] The specific method is: dissolve 8.406 grams of citric acid in 30 grams of water, then add 10 grams of ethylene glycol, place it on a magnetic stirrer and stir it fully for 1 hour, then add 4.125 grams of cerium nitrate and 0.106 grams of strontium nitrate, and heat to volatilize Remove moisture. The gel-like crystal precursor obtained after volatile moisture was placed in a high-temperature furnace, heated at a heating rate of 5°C / min in an air atmosphere, and fired at a constant temperature of 500°C for 180min, and then naturally cooled to room temperature to obtain a particle size of 5 Pale yellow Ce between -15nm 0.95 Sr 0.05 o 2 powder. Will Ce 0.95 Sr 0.05 o 2 After mixing the powder and C according to the mass ratio of 1:3.626, adding deionized water, stirring, filtering and drying to obtain the carrier....

Embodiment 3

[0020] Prepared catalyst, its component and percentage by weight are: Pt 20%, M 1-X N X o 2 17.1%, C62.9%. Wherein M is Ce, N is Sr, and x is 0.08.

[0021]The specific method is: dissolve 8.406 grams of citric acid in 30 grams of water, then add 10 grams of ethylene glycol, and place it on a magnetic stirrer to fully stir. After 1 hour, add 3.995 grams of cerium nitrate and 0.169 grams of strontium nitrate respectively, and heat Evaporate to remove moisture. The gel-like crystal precursor obtained after volatile moisture was placed in a high-temperature furnace. In an air atmosphere, the temperature was raised at a heating rate of 5°C / min, and it was fired at a constant temperature of 700°C for 300min, and then naturally cooled to room temperature. Pale yellow Ce between -15nm 0.92 Sr 0.08 o 2 powder. Will Ce 0.92 Sr 0.08 o 2 After mixing the powder and C according to the mass ratio of 1:3.683, adding deionized water, stirring, filtering and drying to obtain the ca...

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PUM

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Abstract

The invention relates to a direct methanol fuel cell used anode catalyst which contains the following constituents (by weight percent): 20%-40% of Pt, 17.1%-34.2% of M1-xNxO2-Delta and 25.8%-62.9% of C, wherein x is mol ratio between 0.02 and 0.08, M is Zr or Ce, and N is transition metal or alkaline-earth metal. The catalyst accelerator in the catalyst of the invention is the improved doped metal oxide with stronger bi-functional effects compared with the un-doped metal oxide, the methanol oxidative current is higher than the common carbon supported platinum or un-improved similar composite catalyst, the efficiency of the direct methanol fuel cell used anode catalyst is improved, and the preparation process is simpler, thereby being suitable for scale-up production.

Description

technical field [0001] The invention relates to a catalyst in the technical field of fuel cells, in particular to a composite anode electrocatalyst for direct methanol fuel cells. Background technique [0002] Fuel cells have been proven to be the next generation of large-scale development and application of energy conversion devices due to their cleanliness, high efficiency, environmental protection and safety. After their technology is mature and industrialized, they will have a profound impact on human life. Among many fuel cells, direct methanol fuel cells are receiving more and more attention. Compared with other fuel cells, direct methanol fuel cells have the advantages of simple structure, high energy density, short start-up time, and reliable operation. The most important thing is that methanol, the fuel used for power generation, is rich in sources, cheap in price, convenient in storage and easy to add. Therefore, direct methanol fuel cell, as a portable mobile po...

Claims

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Application Information

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IPC IPC(8): B01J23/63H01M4/92
CPCY02E60/50
Inventor 林茂财余晴春
Owner SHANGHAI JIAO TONG UNIV
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