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AgPdIr nano-alloy and preparation and use method thereof

A nano-alloy, nano-technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low starting potential, low battery output voltage, low fuel conversion efficiency, etc., to improve catalytic activity and stability, improve Effects of Discharge Voltage and Energy Efficiency

Active Publication Date: 2020-05-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In summary, although a lot of research has been done on Pd-based bimetallic nanoalloy formate oxidation catalysts, the current Pd-based nanocatalysts still have the following disadvantages: the onset potential of the formate oxidation reaction is low, formic acid The peak potential of the salt oxidation reaction is biased towards the positive potential direction, which will lead to low battery output voltage and low fuel conversion efficiency when the direct formate fuel cell is working

Method used

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  • AgPdIr nano-alloy and preparation and use method thereof
  • AgPdIr nano-alloy and preparation and use method thereof
  • AgPdIr nano-alloy and preparation and use method thereof

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Embodiment 1

[0035] 18 mg of cetylpyridinium chloride surfactant was dissolved in 5 mL of deionized water, ultrasonicated for 10 minutes, and stirred for 10 minutes to form cetylpyridinium chloride aqueous solution. Take 0.267mL sodium chloropalladate (0.01mol·L -1 ), 0.12mL chloroiridic acid (0.01mol L -1 ) and 0.13mL silver nitrate (0.01mol·L -1 ) aqueous solution was added dropwise to the cetylpyridinium chloride aqueous solution obtained above, and stirred for 10 minutes to form an aqueous precursor solution. Prepare 0.3mL with a concentration of 0.1mol L -1 Ascorbic acid aqueous solution, and quickly added dropwise to the precursor aqueous solution obtained above, stopped stirring, and left to react at 35° C. for 3 hours. After the reaction is completed, the obtained black solution is centrifuged and washed three times with deionized water, and finally freeze-dried for 12 hours to obtain the final Ag 32 PD 66 Ir 2 Ternary nano-alloy catalyst. in N 2 The electrochemical test re...

Embodiment 2

[0037] 18 mg of cetylpyridinium chloride surfactant was dissolved in 5 mL of deionized water, ultrasonicated for 10 minutes, and stirred for 10 minutes to form cetylpyridinium chloride aqueous solution. Take 0.267mL sodium chloropalladate (0.01mol·L -1 ), 0.2mL chloroiridic acid (0.01mol L -1 ) and 0.13mL silver nitrate (0.01mol·L -1 ) aqueous solution was added dropwise to the cetylpyridinium chloride aqueous solution obtained above, and stirred for 10 minutes to form an aqueous precursor solution. Prepare 0.3mL with a concentration of 0.1mol L -1 Ascorbic acid aqueous solution, and quickly added dropwise to the precursor aqueous solution obtained above, stopped stirring, and left to react at 35° C. for 3 hours. After the reaction is completed, the obtained black solution is centrifuged and washed three times with deionized water, and finally freeze-dried for 12 hours to obtain the final Ag 30 PD 66 Ir 4 Ternary nano-alloy catalyst. in N 2 The electrochemical test res...

Embodiment 3

[0039] 18 mg of cetylpyridinium chloride surfactant was dissolved in 5 mL of deionized water, ultrasonicated for 10 minutes, and stirred for 10 minutes to form cetylpyridinium chloride aqueous solution. Take 0.267mL sodium chloropalladate (0.01mol·L -1 ), 0.32mL chloroiridic acid (0.01mol L -1 ) and 0.13mL silver nitrate (0.01mol·L -1 ) aqueous solution was added dropwise to the cetylpyridinium chloride aqueous solution obtained above, and stirred for 10 minutes to form an aqueous precursor solution. Prepare 0.3mL with a concentration of 0.1mol L -1 Ascorbic acid aqueous solution, and quickly added dropwise to the precursor aqueous solution obtained above, stopped stirring, and left to react at 35° C. for 3 hours. After the reaction is completed, the obtained black solution is centrifuged and washed three times with deionized water, and finally freeze-dried for 12 hours to obtain the final Ag 28 PD 65 Ir 7 Ternary nano-alloy catalyst. in N 2 The electrochemical test re...

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Abstract

The invention relates to an AgPdIr nano-alloy and a preparation and use method thereof. Ir is added into the AgPd nano-alloy to form an AgPdIr ternary nano-alloy; the AgPdIr ternary nano-alloy is usedas a catalyst, so that the catalytic activity and stability of formate oxidation reaction are improved, the initial potential and peak potential positions of the formate oxidation reaction move towards the negative potential direction, and the discharge voltage and energy efficiency of a direct formate fuel cell are improved. The AgPdIr nano-alloy is used as the catalyst of the formate oxidationreaction, the initial potential of formate oxidation reaction is 0.16-0.2 V, the peak potential is 0.5-0.8 V, and the potential is referenced to a reversible hydrogen electrode; the catalytic activityof the formate oxidation reaction is 2.09-5.14 A.mg <-1> Pd; and the catalytic activity of the formate oxidation reaction is 0.82-1.54 A.mg <-1> Pd after a 4000s durability test, and is 1.29-3.17 times and 7.45-14 times of commercial Pd / C activity and durability.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to an AgPdIr nano-alloy and a preparation and use method thereof, in particular to an anode catalyst for a direct formate fuel cell and a preparation method thereof. Background technique [0002] With the increasingly serious energy crisis and environmental degradation, it is imminent to develop a clean new energy to replace traditional fossil fuels. Direct formate fuel cell is a green and efficient energy conversion device, which has the advantages of non-toxicity, high conversion efficiency and good safety. Generally, the working environment of the direct formic acid fuel cell is alkaline, the formate oxidation reaction occurs at the anode, and the oxygen reduction reaction occurs at the cathode, and its theoretical voltage and theoretical power density are higher than other types of fuel cells. Therefore, in recent years, the research of direct formate fuel cells has attracted ...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/921H01M4/88Y02E60/50
Inventor 陈福义靳亚超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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