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Method for preparing anode catalyst of direct methanol fuel cell

A methanol fuel cell and catalyst technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the catalytic activity of the catalyst cannot be fully utilized, it is difficult to achieve uniform dispersion and molecular scale, small ratio Surface area and other issues, to achieve good application prospects, good electrocatalytic oxidation activity and efficiency, high specific surface area effect

Inactive Publication Date: 2013-03-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent ZL200810116155.6 prepared Pt-SnO 2 / C anode catalyst, but due to SnO 2 It is a semiconductor, the conductivity is not good, and SnO 2 With a small specific surface area, the catalytic activity of the catalyst cannot be fully exerted
In addition, the SnO 2 Mixing directly with carbon black makes it difficult to achieve uniform dispersion and molecular-scale contact

Method used

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  • Method for preparing anode catalyst of direct methanol fuel cell
  • Method for preparing anode catalyst of direct methanol fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 2.0 g of SnCl 4 ·5H 2 O, 0.05 g SbCl 3 and 3.0 g of carbon black were dissolved in 200 ml of absolute ethanol, and stirred well. Then NaOH solution was added dropwise to the mixed solution until pH=9.0. After two hours of reaction, it was filtered, washed three times with absolute ethanol, dried at 100°C in an air atmosphere for 2 hours, and then calcined in a muffle furnace at 600°C for 2 hours to obtain an ATO / C mixture. Take 3.0 g H 2 PtCl 6 ·xH 2 O was dissolved in 100 ml of ethylene glycol containing 0.1 M, and reacted in an inert gas atmosphere at 140 °C for 30 minutes to obtain a sol containing elemental Pt. Then the reacted slurry was mixed with ATO / C, stirred for 2 hours, and then the pH value was adjusted to 7.0 with 1 M sulfuric acid solution. After filtration, it was dried in an oven at 130° C. for 2 hours to obtain the catalyst Pt-ATO / C.

[0021] pass figure 2 It can be concluded that, with Pt-SnO 2 / C Compared with the commercial catalyst P...

Embodiment 2

[0023] Take 7.0 g of SnCl 4 ·5H 2 O, 0.45 g SbCl 3 and 30.0 g of carbon black were dissolved in 400 ml of absolute ethanol, and stirred evenly. Then 0.2M NaOH solution was added dropwise to the mixed solution until the pH value = 10.0. After reacting for two hours, it was filtered, washed three times with absolute ethanol, dried in a vacuum oven at 80°C for 2 hours, and then calcined in a muffle furnace at 750°C for 2 hours to obtain an ATO / C mixture. Take 9.0 g H 2 PtCl 6 ·xH 2 O was dissolved in 200 ml of ethylene glycol containing 0.1M NaOH, reacted in an inert gas atmosphere at 130 °C for 30 minutes, then mixed the reacted slurry with ATO / C, stirred for 2 hours, and then washed with 1M nitric acid solution Adjust the pH to 6.0. Then filter and dry in an oven at 120° C. for 2 hours to obtain the catalyst Pt-ATO / C.

Embodiment 3

[0025] Take 10.0 g of SnCl 4 ·5H 2 O, 0.65 g SbCl 3 and 11.0 g of carbon black were dissolved in 400 ml of absolute ethanol, and stirred evenly. Aqueous ammonia was then added dropwise to the mixed solution until the pH value = 5.0. After reacting for 2 hours, filter, beat and wash with deionized water three times, dry in air atmosphere at 100°C for 2 hours, and then calcinate in a muffle furnace for 2 hours to obtain an ATO / C mixture. Take 18.0 g H 2 PtCl 6 ·xH 2 O was dissolved in 500 ml of ethylene glycol containing 0.1M NaOH, reacted in an inert gas atmosphere at 130 °C for 40 minutes, then mixed the reacted slurry with ATO / C, stirred for 2 hours, and then washed with 1M sulfuric acid solution Adjust the pH to 5.0. Then filter and dry in an oven at 120° C. for 2 hours to obtain the catalyst Pt-ATO / C.

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Abstract

The invention relates to a method for preparing an anode catalyst of a direct methanol fuel cell. The method comprises the following steps of: dispersing and dissolving carbon black, SnCl4.5H2O and SbCl3 in absolute ethanol; filtering, washing, drying, grinding and calcining to obtain an antimony tin oxide / carbon (ATO / C) carrier, which has a uniform size, is uniformly dispersed and is hardly agglomerated, by taking ammonia water or sodium hydroxide solution as a precipitator; dissolving H2PtCl6.6H2O in ethylene glycol; heating in the atmosphere of inert gas to obtain platinum (Pt) sol; and mixing the PT sol and ethanol suspension of the ATO / C to obtain a Pt-ATO / C catalyst. The method has a simple process and is low in cost; and the prepared Pt-ATO / C catalyst is highly dispersed, has a uniform particle size, does not have obvious agglomeration phenomenon, has a lower starting potential and higher current density, shows excellent electro-catalytic oxidation activity and efficiency and has a good application prospect.

Description

technical field [0001] The invention relates to the field of preparation of anode catalysts, in particular to a preparation method of direct methanol fuel cell anode catalysts. Background technique [0002] Direct methanol fuel cell (DMFC) has the advantages of high energy conversion efficiency, no pollution, easy storage, portability, and low working environment temperature, and has become the most popular chemical power source for portable electronic devices and electric vehicles. The key material of DMFC is the anode catalyst, whose activity directly affects the performance of the fuel cell. At present, the catalyst used in DMFC is metal platinum supported on the surface of carbon. However, during the electrochemical oxidation of methanol, intermediate products (such as CO) are adsorbed and accumulated on the surface of the catalyst, which easily poisons the catalyst, thereby reducing the activity and performance of the catalyst. efficiency. The way to solve this proble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88B01J23/40
CPCY02E60/50
Inventor 张清华潘成强马跃辉李英芝陈大俊
Owner DONGHUA UNIV
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