Palladium oxide catalyst for direct formic acid fuel cell and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2019326608-A1
Application number	US-201716466642-A
Country	US
Kind code	A1
Filing date	Nov 30, 2017
Priority date	Dec 5, 2016
Publication date	Oct 24, 2019
Grant date	—

Abstract

The present invention discloses a palladium oxide catalyst for a direct formic acid fuel cell and a preparation method thereof The preparation method is as follows: dissolving a palladium chloride to prepare an aqueous solution, adding a sodium citrate or a potassium citrate, adjusting the solution to a pH value ranging from 9 to 13; then, placing the above solution in a microwave reactor for microwave reaction for 3 minutes to 30 minutes, and refluxing and magnetically stirring simultaneously during the reaction to obtain a palladium oxide collid solution; after the palladium oxide colloid is cooled, adding a commercial carbon powder or a carbon nanotube to collect the palladium oxide; and performing suction filtration finally, washing a filter cake, drying the filter cake under vacuum, and grounding the filter cake to obtain a carbon-supported palladium oxide catalyst.

First claim

1 . A preparation method of a palladium oxide catalyst for a direct formic acid fuel cell, comprising the following steps of:
(1) dissolving a water-soluble palladium precursor in water to prepare a palladium precursor solution, then adding a citrate, and adjusting the solution to a pH value ranging from 9 to 13 after complete dissolution; (2) placing the solution obtained in the step (1) in a microwave reactor for microwave reaction, and refluxing by condensation water and magnetically stirring simultaneously to obtain a palladium oxide colloid solution; (3) after the palladium oxide colloid solution is cooled, adding a carbon support to collect the palladium oxide colloid; and (4) performing suction filtration on a mixed solution obtained in the step (3), and then cleaning a filter cake, drying the filter cake under vacuum, and grounding the filter cake to obtain a carbon-supported palladium oxide catalyst.

2 . The preparation method according to claim 1 , wherein the water-soluble palladium precursor in the step (1) is one of a palladium chloride, a sodium chloropalladate and a potassium chloropalladate.

3 . The preparation method according to claim 1 , wherein the citrate in the step (1) is a sodium citrate or a potassium citrate.

4 . The preparation method according to claim 1 , wherein a molar ratio of the citrate to the water-soluble palladium precursor in the step (1) is 5:1 to 0.5:1.

5 . The preparation method according to claim 1 , wherein the microwave reaction in the step (2) is conducted at a power ranging from 600 W to 1500 W, and lasts for 3 minutes to 30 minutes.

6 . The preparation method according to claim 1 , wherein the carbon support in the step (3) is a commercial carbon powder or a carbon nanotube.

7 . The preparation method according to claim 1 , wherein an addition amount of the carbon support in the step (3) accounts for 60 wt % to 90 w % of the palladium metal in the palladium oxide colloid.

8 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 1 .

9 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 8 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

10 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 2 .

11 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 3 .

12 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 4 .

13 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 5 .

14 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 6 .

15 . A palladium oxide catalyst for a direct formic acid fuel cell prepared by the preparation method according to claim 7 .

16 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 10 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

17 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 11 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

18 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 12 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

19 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 13 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

20 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 14 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

21 . The palladium oxide catalyst for a direct formic acid fuel cell according to claim 15 , wherein a mass ratio of the palladium oxide in the palladium oxide catalyst ranges from 10% to 40%.

Assignees

• Univ South China Tech

Inventors

• Zeng Jianhuang
• Jiang Yangcheng
• Liu Zhen
• Liao Shijun

Classifications

• B01J37/346

  of microwave energy · CPC title

• B01J23/44

  Palladium · CPC title

• H01M8/1009

  with one of the reactants being liquid, solid or liquid-charged (H01M8/12 takes precedence) · CPC title

• H01M4/926

  on carbon or graphite · CPC title

• H01M4/923

  Compounds thereof with non-metallic elements · CPC title