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Preparation method of Pd/Ag nano-alloy catalyst for direct ethanol fuel cell

A nano-alloy and fuel cell technology, applied in the direction of fuel cells, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of high cost, physical injury of operators, etc., and achieve low equipment requirements and short production cycle Short and easy operation

Active Publication Date: 2017-11-10
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because laser, ultraviolet light and gamma radiation are easy to cause harm to the operator's body, and the cost is high, there are certain limitations in application and promotion.

Method used

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  • Preparation method of Pd/Ag nano-alloy catalyst for direct ethanol fuel cell
  • Preparation method of Pd/Ag nano-alloy catalyst for direct ethanol fuel cell
  • Preparation method of Pd/Ag nano-alloy catalyst for direct ethanol fuel cell

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Experimental program
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Effect test

Embodiment 1

[0041] 1. Preparation method

[0042] A Pd / Ag nano-alloy catalyst for direct ethanol fuel cells, prepared by the following method:

[0043] (1) Add 4 mL of water and 20 mL of ethanol in turn to the reaction vessel, and stir to obtain a water-ethanol mixed solution system;

[0044] (2) Add 0.007 g of Pd(NO 3 ) 2 Powder, 0.012 g AgNO 3 , 0.004 g of sodium citrate and 0.0982 g of PVP were added to the water-ethanol mixed solution system, and the prepared solution was placed on a constant temperature magnetic stirrer at 20 ° C for 2 h;

[0045] (3) Put the evenly stirred reaction solution in a self-designed light reaction box, and place it under a 200 W ordinary commercially available incandescent light for 2 hours in parallel to irradiate;

[0046] (4) The obtained black precipitate was separated by centrifugation, washed twice with absolute ethanol and deionized water, and dried in a vacuum oven at 35 °C for 48 h, which was the Pd / Ag nano-alloy catalyst material.

[0047] T...

Embodiment 2

[0055] 1. Preparation method

[0056] A Pd / Ag nano-alloy catalyst for direct ethanol fuel cells, prepared by the following method:

[0057] (1) Add 4 mL of water and 20 mL of ethanol in turn to the reaction vessel, and stir to obtain a water-ethanol mixed solution system;

[0058] (2) Add 0.007 g of Pd(NO 3 ) 2 Powder, 0.005 g AgNO 3 , 0.001 g of sodium citrate and 0.098 g of PVP were added to the water-ethanol mixed solution system, and the prepared solution was placed on a constant temperature magnetic stirrer at 23 ° C for 2 h;

[0059] (3) Put the evenly stirred reaction solution in a self-designed light reaction box, and place it under a 200 W ordinary commercially available incandescent light for 2 hours in parallel to irradiate;

[0060] (4) The obtained black precipitate was separated by centrifugation, washed twice with absolute ethanol and deionized water, and dried in a vacuum oven at 45 °C for 12 h, which was the Pd / Ag nano-alloy catalyst material.

[0061] Th...

Embodiment 3

[0067] 1. Preparation method

[0068] A Pd / Ag nano-alloy catalyst for direct ethanol fuel cells, prepared by the following method:

[0069] (1) Add 6 mL of water and 12 mL of ethylene glycol in sequence to the reaction vessel, and stir to obtain a water-alcohol mixed solution system;

[0070] (2) Add 0.007 g of Pd(NO 3 ) 2 , 0.002 g AgNO 3 , 0.004 g of sodium citrate and 0.098 g of PVP were added to the water-ethanol mixed solution system, and the prepared solution was placed on a constant temperature magnetic stirrer at 25 ° C for 2 h;

[0071] (3) Put the evenly stirred reaction solution in a self-designed light reaction box, and place it under a 15 W ordinary commercially available energy-saving light for 12 h in parallel irradiation;

[0072] (4) The obtained black precipitate was separated by centrifugation, washed twice with absolute ethanol and deionized water, and dried in a vacuum oven at 40 °C for 24 h, which was the Pd / Ag nano-alloy catalyst material.

[0073] ...

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Abstract

The invention discloses a preparation method of a Pd / Ag nano-alloy catalyst for a direct ethanol fuel cell. The method comprises steps as follows: alcohol is added to water in the volume ratio of alcohol to water being (3-7):1, the mixture is stirred and sequentially mixed with polyvinylpyrrolidone, a metal palladium chloride precursor, a metal silver salt precursor and sodium citrate, the mixture is stirred at the temperature of 20-25 DEG C for 1.5-2.5 h and reacts for 1.8-12 h under a light condition, centrifugal separation is performed, precipitates are collected, washed and dried, and the Pd / Ag nano-alloy catalyst can be obtained. Polyvinylpyrrolidone is taken as a stabilizer and a guiding agent, the Pd / Ag nano-alloy catalyst is synthesized in one step under a mild condition by the aid of the reducing action of alcohol and sodium citrate, the synthesis efficiency is improved, the yield is increased, besides, the morphology of the catalyst has controllability, the catalyst has better catalytic activity for ethanol and can be used for the direct ethanol fuel cell, the preparation process is simple, the production cycle is short, large-scale production is easy to realize, and the catalyst has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and more specifically relates to a preparation method of a Pd / Ag nano-alloy catalyst for direct ethanol fuel cells. Background technique [0002] Direct Alcohol Fuel Cell (DAFC) is a type of electrochemical reaction device that directly converts the chemical energy of fuel (methanol, ethanol, etc.) into electrical energy. Because DAFC has the characteristics of rich fuel resources, low operating temperature, high specific energy density, and convenient storage and portability, it has become one of the new energy technologies for international fuel cell research and development. However, there are still considerable technical bottlenecks in this technology. The performance and cost of its catalyst have always been two key factors hindering its commercialization process. DAFC is a low-temperature fuel cell, and its operating temperature generally does not exceed 100°C. At this temperature, most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1011B82Y30/00
CPCB82Y30/00H01M4/921H01M8/1013Y02E60/50Y02P70/50
Inventor 王艳丽谭德新
Owner LINGNAN NORMAL UNIV
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