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

A formic acid fuel cell and palladium oxide technology, which is applied in catalyst activation/preparation, fuel cells, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of small electrocatalyst particle size, non-recyclability, and high cost , to achieve the effect of short reaction time, energy saving and small particle size

Active Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrocatalyst prepared by this method has a small particle size and is uniformly dispersed, but its disadvantages are high energy consumption, and ethylene glycol itself is oxidized during the reaction process, which cannot be recycled, and the cost is high

Method used

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

Examples

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Effect test

Embodiment 1

[0033] 2.5 ml prepared 0.12 mol L -1 Palladium chloride solution was added to 100 ml of water, and then 1.5 × 10 -3 mol of sodium citrate, the mol ratio of sodium citrate to palladium chloride is 5:1. Adjust the pH to 9; place the solution in a microwave reactor with a power of 1200W, microwave reflux for 17 minutes and keep magnetic stirring to obtain a palladium oxide colloidal solution; after the palladium oxide colloidal solution is cooled, add 120 mg of carbon powder to collect the palladium oxide; Finally, suction filtration, the filter cake was washed, dried in vacuum, and ground to obtain a carbon-supported palladium oxide catalyst, and the mass ratio of palladium oxide in the palladium oxide catalyst was 20%. figure 1 The transmission electron micrograph of the palladium oxide colloid prepared for the present embodiment, from figure 1 It can be seen that the average particle size of palladium oxide is 2.5 nm, and the distribution is uniform. figure 2 For the X-ray...

Embodiment 2

[0035] 2.5 ml prepared 0.12 mol L -1 Palladium chloride solution was added to 100 ml of water, and then 1.5 × 10 -4 mol sodium citrate, the molar ratio of sodium citrate to palladium chloride is 0.5:1. Adjust the pH to 13; place the solution in a microwave reactor with a power of 600W, microwave reflux for 30 minutes and keep magnetic stirring to obtain a palladium oxide colloidal solution; after the palladium oxide colloidal solution is cooled, add 47 mg of carbon nanotubes to collect palladium oxide Finally, suction filtration, the filter cake is washed, vacuum-dried, and ground to obtain a carbon-supported palladium oxide catalyst, and the mass ratio of palladium oxide in the palladium oxide catalyst is 40%. The average particle size of the palladium oxide prepared in this example is 2.2 nm, and it can be seen from the X-ray diffraction pattern that the catalyst prepared in this example is palladium oxide. The palladium oxide catalyst prepared in this embodiment is 0.5 mo...

Embodiment 3

[0037] 4 ml prepared 0.12 mol L -1 Palladium chloride solution was added to 100 ml of water, and then 1.32 × 10 -3 mol sodium citrate, the mol ratio of sodium citrate to palladium chloride is 2.75:1. Adjust the pH to 11; place the solution in a microwave reactor with a power of 1500W, microwave reflux for 3 minutes and keep magnetic stirring to obtain a palladium oxide colloidal solution; after the palladium oxide colloidal solution is cooled, add 400 mg of carbon powder to collect the palladium oxide; Finally, suction filtration, the filter cake was washed, vacuum-dried, and ground to obtain a carbon-supported palladium oxide catalyst, and the mass ratio of palladium oxide in the palladium oxide catalyst was 10%. The average particle size of the palladium oxide catalyst prepared in this example is 2.3 nm. 0.5 mol L at room temperature -1HCOOH+0.5 mol L -1 h 2 SO 4 In solution, the scanning speed is 20mV s -1 , the peak current density of the palladium oxide catalyst p...

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Abstract

The invention discloses a palladium oxide catalyst used for direct formic acid fuel cells and a preparation method of the palladium oxide catalyst. The preparation method comprises the following steps: dissolving palladium chloride to be prepared into a water solution, adding sodium citrate or potassium citrate, and adjusting the pH value of the solution to be 9 to 13; then putting the solution into a microwave reactor to carry out a microwave reaction for 3 to 30 minutes, and carrying out backflow and magnetic stirring while reacting so as to obtain a palladium oxide colloid solution; after the palladium oxide colloid is cooled, adding commercial carbon powder or carbon nano tubes to collect palladium oxide; and finally carrying out suction filtration, washing a filter cake cleanly, carrying out vacuum drying, and grinding to obtain the carbon-loaded palladium oxide catalyst. The palladium oxide catalyst uses water as a solvent, is green and environmentally-friendly, and is free of any organic matter to be involved into the reaction in the whole process; the catalyst is free of the addition of any protective agent with high molecular weight, and post-processing is not needed after catalyst preparation; the reaction time is short, and the energy consumption is saved; the process for preparing the palladium oxide catalyst in the invention is simple, and batch industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the field of electrocatalysts for direct formic acid fuel cells, in particular to a palladium oxide catalyst for direct formic acid fuel cells and a preparation method thereof. Background technique [0002] In fuel cells, electrocatalysts play the role of electrochemical reaction "factories" and are the core materials in batteries. The development of electrocatalysts is one of the keys to fuel cells. Noble metal platinum, palladium, or platinum-palladium alloys have very high catalytic activity for the oxidation reaction and oxygen reduction reaction of hydrogen, formic acid, methanol, ethanol and other fuel molecules, so most of the commercial and practical electrocatalysts at this stage are carbon-supported. Platinum or palladium on carbon electrocatalysts. For anodic electrocatalysts for formic acid oxidation in direct formic acid fuel cells, palladium catalysts or carbon-supported palladium catalysts are recognized as elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8803H01M4/9041B01J23/44B01J35/0013B01J35/0033B01J37/346H01M4/9016H01M4/923H01M4/926H01M8/1009Y02E60/50Y02P70/50B01J21/185B01J37/009H01M4/9083
Inventor 曾建皇蒋扬程刘真廖世军
Owner SOUTH CHINA UNIV OF TECH
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