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Preparation method of graphene-supported Pd nanoflower catalyst and product of graphene-supported Pd nanoflower catalyst and application in formic acid fuel cell

A technology of graphene and nanoflowers, applied in fuel cells, battery electrodes, circuits, etc., to achieve excellent formic acid oxidation catalytic activity, outstanding stability, and good application prospects

Active Publication Date: 2016-11-16
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the pristine graphene surface is very inert, it is challenging to load nanocatalysts on its surface.

Method used

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  • Preparation method of graphene-supported Pd nanoflower catalyst and product of graphene-supported Pd nanoflower catalyst and application in formic acid fuel cell
  • Preparation method of graphene-supported Pd nanoflower catalyst and product of graphene-supported Pd nanoflower catalyst and application in formic acid fuel cell
  • Preparation method of graphene-supported Pd nanoflower catalyst and product of graphene-supported Pd nanoflower catalyst and application in formic acid fuel cell

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of described graphene-loaded Pd nano flower catalyst, comprises the steps:

[0023] (1) Preparation of phosphomolybdic acid-modified graphene (PMA-G): Weigh 10 mg of graphene, add it to 20 mL of 10 mg / mL phosphomolybdic acid, ultrasonicate for 2 hours, filter to get a solid, and wash with secondary water Solid, dry the solid in a vacuum oven at 90°C for 6 hours;

[0024] (2)H 2 PdCl 4 Solution preparation: weigh 100mg of PdCl 2 was added to 100 ml of 1M HCl to prepare H 2 PdCl 4 Stock solution: take 1ml of stock solution, add 10ml of secondary water, dilute to H 2 PdCl 4 solution;

[0025] (3) Using NaOH to adjust H 2 PdCl 4 Solution pH value to 3.25;

[0026] (4) take by weighing the PMA-G sample 2mg that step (1) obtains, join the H in step (3) 2 PdCl 4 In the solution, sonicate for 5 minutes;

[0027] (5) Quickly add 2ml of ascorbic acid of 13mg / mL prepared in the solution of step (4);

[0028] (6) stirring the solution obtained i...

Embodiment 2

[0031] The preparation method of described graphene-loaded Pd nano flower catalyst, comprises the steps:

[0032] (1) Preparation of phosphomolybdic acid-modified graphene (PMA-G): Weigh 20 mg of graphene, add it to 50 mL of 10 mg / mL phosphomolybdic acid, ultrasonicate for 5 hours, filter to obtain a solid, and wash with secondary water Solid, dry the solid in a vacuum oven at 90°C for 12 hours;

[0033] (2)H 2 PdCl 4 Solution preparation: weigh 300mg of PdCl 2 was added to 100 ml of 1M HCl to prepare H 2 PdCl 4 Stock solution, take 2ml of the stock solution, add 11ml of secondary water, dilute to obtain H 2 PdCl 4 solution;

[0034] (3) Adjust H with NaOH 2 PdCl 4 Solution pH value to 5.36;

[0035] (4) take by weighing the PMA-G sample 4mg that step (1) obtains, join the H in the step (3) 2 PdCl 4 In the solution, ultrasonic for 16min;

[0036] (5) Quickly add 3ml of ascorbic acid of 15mg / mL prepared in the solution of step (4);

[0037] (6) stirring the soluti...

Embodiment 3

[0040] The preparation method of described graphene-loaded Pd nano flower catalyst, comprises the steps:

[0041] (1) Preparation of phosphomolybdic acid-modified graphene (PMA-G): Weigh 30 mg of graphene, add it to 100 mL of 10 mg / mL phosphomolybdic acid, ultrasonicate for 4 hours, filter to obtain a solid, and wash with secondary water Solid, dry the solid in a vacuum oven at 70°C for 24 hours;

[0042] (2)H 2 PdCl 4 Solution preparation: weigh 300mg of PdCl 2 was added to 200 ml of 1M HCl to prepare H 2 PdCl 4 Stock solution, take 2ml of the stock solution, add 10ml of secondary water, dilute to H 2 PdCl 4 solution;

[0043] (3) Adjust H with NaOH 2 PdCl 4 Solution pH value to 6.0;

[0044](4) take by weighing the PMA-G sample 3mg that step (1) obtains, join the H in the step (3) 2 PdCl 4 In the solution, ultrasonic for 14min;

[0045] (5) Quickly add 1 to 5 ml of prepared 13 to 15 mg / mL ascorbic acid in the solution of step (4);

[0046] (6) stirring the solu...

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Abstract

The invention discloses a preparation method of a graphene-supported Pd nanoflower catalyst and a product of the graphene-supported Pd nanoflower catalyst and an application in a formic acid fuel cell. A Pd nanoflower which is uniform in size and distribution directly grows on the graphene surface through modifying a phosphomolybdic acid on the graphene surface by a method of reducing H2PdCl4 through an ascorbic acid. According to the method, no surfactant is added; the overall synthetic process is carried out in a water solution at a room temperature and atmospheric pressure; and any complicated instrument is not needed. The Pd nanoflower of the prepared catalyst can be firmly combined on the graphene surface; and the dispersity is relatively high. The catalyst is applied to the formic acid fuel cell, has very excellent formic acid oxidation catalysis activity and outstanding stability, can be used as a positive catalyst of a direct formic acid fuel cell, and has a very broad application prospect.

Description

technical field [0001] The invention belongs to the field of direct formic acid fuel cells, and in particular relates to a preparation method of a graphene-supported Pd nanoflower catalyst, a product thereof and an application in formic acid fuel cells. Background technique [0002] Due to the convenience of fuel storage and transportation, suitable operating temperature, extremely high power density and theoretical open circuit voltage, and low fuel permeation, direct formic acid fuel cells are potential portable electronic devices and energy supply devices for electric vehicles. . However, their practical commercial applications are severely hampered by slow anodic and cathodic reaction kinetics. For the formic acid oxidation reaction at the anode, the current better catalysts include noble metals such as platinum and palladium. The price of Pd is cheaper than that of Pt, and its catalytic performance for formic acid oxidation is better than that of Pt and its ability to ...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M8/1009
CPCH01M4/926H01M8/1009Y02E60/50
Inventor 袁伟永范秀玲李长明
Owner SOUTHWEST UNIVERSITY
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