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Pulse electrodeposition method for producing catalyst for direct methanol fuel cell

A methanol fuel cell, pulse electrodeposition technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Control, catalyst preparation cost and high problems, to achieve the effect of improving methanol electro-oxidation activity, high methanol electro-oxidation catalytic activity, and simple method

Inactive Publication Date: 2007-04-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method of chemical reduction is usually used, mainly including impregnation method and colloid method, such as the literature M.Gtz, H.Wendt, Binary and ternary anodecatalyst formulations including the elements W, Sn and Mo for PEMFCs operated onmethanol or reformate gas, In Electrochimica Acta, 43(1998) 3637-3644, Pt-based catalysts were prepared by impregnation method and colloid method respectively. Studies have shown that the performance of the catalyst synthesized by the colloid method is better, and the catalytic performance for methanol electrooxidation is better than that synthesized by the impregnation method. Catalyst, but this method needs to use macromolecular organic matter as surface protection agent and reducing agent, and must be prepared in anhydrous and oxygen-free system at the same time, the operation is cumbersome, the process is not easy to accurately control, and the catalyst preparation cost is high
Compared with the method of chemical reduction, the research of electrochemical reduction is less, document J.J.Whalen III, J.D.Weiland, P.C Searson, Electrochemical Deposition of Platinum from Aqueous Ammonium Hexachloroplatinate Solution, Journal of The Electrochemical Society, 152(11)(2005) In C738-C743, it is proposed to use the constant potential method for electrodeposition on the gold film, and compare the particles and morphology of the electrodeposited Pt when the potential is kept constant at different potential values, but the particle size is relatively large, so that the Pt catalyst The active surface area is relatively small, resulting in relatively low catalytic activity

Method used

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  • Pulse electrodeposition method for producing catalyst for direct methanol fuel cell
  • Pulse electrodeposition method for producing catalyst for direct methanol fuel cell
  • Pulse electrodeposition method for producing catalyst for direct methanol fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Activated carbon black Vulcan XC-72 was preheated at 500°C for 60 minutes. Weigh 40 mg of activated carbon black and place it in 10 ml of ethanol, add 350 μL of 5% ionic emulsion Nafion solution by mass percentage, and ultrasonically disperse the mixed solution for 80 minutes to form a carbon slurry. Take 100 μL of carbon slurry and drop it on the graphite substrate. After the ethanol is evaporated, the electrode is vacuum-dried at 75°C for 5 hours to obtain the working electrode used for electrodeposition. Electrodeposition is performed on the working electrode, and a platinum electrode is used as the anode , the saturated calomel electrode (SCE) is the reference electrode, and the electrolyte is 0.5mol L -1 h 2 SO 4 and 0.5mmol·L -1 For the mixed solution of chloroplatinic acid, the electrodeposition temperature is 45° C., and argon gas is passed through the electrolyte solution for 20 minutes before electrodeposition to eliminate the influence of dissolved oxygen ...

Embodiment 2

[0027] Activated carbon black Vulcan XC-72 was preheated at 600°C for 30 minutes. Weigh 50 mg of activated carbon black and place it in 10 ml of ethanol, add 200 μL of 5% ionic emulsion Nafion solution by mass percentage, and ultrasonically disperse the mixed solution for 30 minutes to form a carbon slurry. Take 100 μL of carbon slurry and drop it on the graphite substrate. After the ethanol evaporates, the electrode is vacuum-dried at 60°C for 8 hours to prepare the working electrode used for electrodeposition. A platinum electrode is used as the counter electrode, a saturated calomel electrode (SCE) is used as the reference electrode, and the electrolyte is 0.5mol L -1 h 2 SO 4 and 1.0mmol·L -1 For the mixed solution of chloroplatinic acid, the electrodeposition temperature is 65°C. Argon was passed through the electrolyte for 30 min before electrodeposition to eliminate the influence of dissolved oxygen in the solution. During electrodeposition, argon is introduced int...

Embodiment 3

[0029]Activated carbon black Vulcan XC-72 was preheated at 700°C for 20 minutes. Weigh 70 mg of activated carbon black and place it in 9 ml of ethanol, add 500 μL of 5% ionic emulsion Nafion solution by mass percentage, and ultrasonically disperse the mixed solution for 50 minutes to form a carbon slurry. Take 80 μL of carbon slurry and drop it on the graphite substrate. After the ethanol evaporates, the electrode is vacuum-dried at 50°C for 12 hours to prepare the working electrode used for electrodeposition. A platinum electrode is used as the counter electrode, a saturated calomel electrode (SCE) is used as the reference electrode, and the electrolyte is 0.5mol L -1 h 2 SO 4 and 4.0mmol·L -1 The mixed solution of chloroplatinic acid, the temperature of electrodeposition is 25 ℃. Argon was passed through the electrolyte for 40 min before electrodeposition to eliminate the influence of dissolved oxygen in the solution. During electrodeposition, argon is introduced into t...

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Abstract

A catalyst used directly for the methanol fuel battery is prepared through depositing Pt on the carrier (prepared active carbon black and ionic emulsion) by computer controlled electrochemical synthesis method.

Description

technical field [0001] The invention belongs to the technical field of producing catalysts by chemical and chemical methods and the field of fuel cells, in particular to a preparation method of platinum-based direct methanol fuel cell catalysts. Background technique [0002] Direct Methanol Fuel Cell (DMFC) has broad development prospects in portable power supply, electric vehicles and other fields because of its high energy density, easy transportation and storage of liquid fuel, and low operating temperature. One of the key materials of DMFC is the electrode catalyst, whose activity directly affects the performance of the battery. The precious metal platinum also has excellent catalytic performance under low temperature (<80°C) operating conditions, so the current electrocatalysts used in DMFC all use platinum as the main component. However, due to limited resources and high price of platinum, its utilization rate in DMFC cannot meet the requirements of commercial appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J21/18C25D9/08H01M4/92
CPCY02E60/50
Inventor 王新东陈玲郭敏
Owner UNIV OF SCI & TECH BEIJING