Method for preparing platinum catalyst by electrodeposition

A platinum catalyst and electrodeposition technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low dispersion and coverage, and particle size reduction , low controllability and other issues, to achieve the effect of improving utilization and activity, simple application method and reducing cost

Inactive Publication Date: 2010-12-29
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

As reported by Kyoung Hwan Choi, et.al., Electrode fabrication for proton exchange membrane fuel cells by pulse electrodeposition, J.Power Sources 75 (1998) 230, but adopting two-electrode system to carry out pulse electrodeposition to prepare platinum catalyst, there are Platinum as an anode has the disadvantages of high cost and low controllability
Another example is the invention of CN1947835A "a method for preparing a catalyst for direct methanol fuel cell by pulse electrodeposition", which proposes a method of directly depositing Pt on the activated carbon black / ionic emulsion carrier, although it has a slightly higher methanol electrolysis rate than the commercial catalyst. Oxidation catalytic activity, but the particle size is in the range of 100-300nm, and the dispersion and coverage rate are not high. To improve its catalytic methanol electrooxidation performance, the particle size needs to be reduced, the dispersion and coverage rate need to be improved, and the activity needs to be further enhanced.

Method used

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  • Method for preparing platinum catalyst by electrodeposition
  • Method for preparing platinum catalyst by electrodeposition
  • Method for preparing platinum catalyst by electrodeposition

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 50 mg of acidified Vulcan XC-72 into 10 mL of ethanol, add 100 μL of Solution (5wt.%, density 45mgNafion / mL) was ultrasonically dispersed for 60 minutes, mixed evenly to form a carbon slurry, The mass percentage of the solution and the ethanol suspension was 100:1; 75 μL was dropped onto the treated glassy carbon electrode (with an area of ​​0.28 cm 2 ) surface; after the ethanol evaporated, the electrode was vacuum-dried at 50°C for 7 hours to obtain the working electrode used in the electrodeposition process, the counter electrode was a platinum electrode, and the reference electrode was a saturated calomel electrode (SCE). The above potentials are all relative to SCE. The electrolyte is 0.5mol L -1 h 2 SO 4 +2.0mmol·L -1 h 2 PtCl 6 . Pulse electrodeposition is carried out in two stages for pulse electrodeposition of platinum, the I stage is at a peak current density of 12mA cm -2 After deposition for 120s, the peak current density in stage II is 8mA·...

Embodiment 2

[0020] Weigh 40 mg of acidified Vulcan XC-72 into 5 mL of ethanol, add 200 μL of Solution (5wt.%, density 45mgNafion / mL) was ultrasonically dispersed for 40 minutes, mixed uniformly to form a carbon slurry, The mass percentage of the solution and the ethanol suspension is 100:4; take 75 μL and drop it on the treated graphite electrode (with an area of ​​0.5 cm 2 ) surface; after the ethanol evaporated, the electrode was vacuum-dried at 60°C for 5 hours to obtain the working electrode used in the electrodeposition process, the counter electrode was a platinum electrode, and the reference electrode was a saturated calomel electrode (SCE). The electrolyte is 0.5mol L -1 h 2 SO 4 +0.5mmol·L -1 h 2 PtCl 6 . Pulse electrodeposition is carried out in two stages for pulse electrodeposition of platinum, the I stage is at a peak current density of 36mA cm -2 Deposition for 60s, the peak current density of the second stage is 6mA·cm -2 , the total deposition charge is 1.2C cm ...

Embodiment 3

[0022] Weigh 50 mg of acidified Vulcan XC-72 into 10 mL of ethanol, add 200 μL of Solution (5wt.%, density 45mgNafion / mL) was ultrasonically dispersed for 30 minutes, mixed evenly to form a carbon slurry, The mass percentage of the solution and the ethanol suspension was 100:2; 100 μL was dropped on the surface of the treated graphite electrode; after the ethanol evaporated, the electrode was vacuum-dried at 60°C for 5 hours to obtain the working electrode used in the electrodeposition process , the counter electrode is a platinum electrode, and the reference electrode is a saturated calomel electrode (SCE). The electrolyte is 0.5mol L -1 h 2 SO4 +1.0mmol·L -1 h 2 PtCl 6 +10 -5 mmol·L -1 PEG (MW 400). Pulse electrodeposition is carried out in two stages for pulse electrodeposition of platinum, the I stage is at a peak current density of 24mA cm -2 Under deposition for 90s, the peak current density of stage II is 10mA·cm -2 , the total deposition charge is 12C cm -...

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Abstract

The invention relates to a preparation of a platinum catalyst of a direct methanol fuel cell, which adopts a method of electrodepositing and carries out pulse electrodepositing on platinum by two steps, namely a larger current is adopted for forming a crystal nucleus in step I; a small current is adopted for the growing the crystal nucleus in step II; the grain diameter of the prepared catalyst can be reduced through changing the applied electric signal; thereby leading the formed platinum grains to be more dispersive and have a higher covering rate and a larger specific surface; thereby reducing the platinum loading capacity of unit area of the electrodes, improving utilization rate and activity and simultaneously reducing the cost of the catalyst. The method is simple and controllable to be applied. The prepared platinum catalyst can not only be applied to the direct methanol fuel cell, but also can be applied to other fuel cells as catalysts. Besides, the method can be expanded andapplied to platinum-ruthenium codeposition and other multi-metal codeposition.

Description

technical field [0001] The invention relates to the fields of fuel cell and catalyst preparation, in particular to a method for preparing a platinum-based direct methanol fuel cell catalyst. Background technique [0002] Direct methanol fuel cell (DMFC) has attracted much attention due to its advantages of high energy conversion efficiency, no pollution, no noise, simple system structure, high specific energy and convenient fuel portability. One of the key materials of DMFC is the electrode catalyst, whose activity directly affects the performance of the battery. At present, the electrocatalysts used in DMFC all use platinum as the main component, but platinum is a precious metal with scarce resources, and its utilization rate and activity are not high enough to meet the requirements of DMFC commercial use. The position of the catalyst platinum particles must be in the area that can contact the reactants, electron conductors and proton conductors at the same time, that is, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42C25D3/50H01M4/92
CPCY02E60/50
Inventor 王新东李晶晶叶锋王永亮王同涛苗睿瑛薛方勤刘芸
Owner UNIV OF SCI & TECH BEIJING
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