PdP/C catalyst for high-performance direct methanoic acid fuel cell and producing method thereof

A formic acid fuel cell and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as loss of activity and difficulty in preparing Pd catalyst

Inactive Publication Date: 2007-03-21
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For Pd catalysts, the general preparation method cannot overcome the shortcomings of Pd particle oxidation deactivation, and it is difficult to prepare Pd catalysts with smaller particle sizes. At the same time, pure Pd catalysts with smaller particle sizes are more likely to be oxidized and lose their activity in air

Method used

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  • PdP/C catalyst for high-performance direct methanoic acid fuel cell and producing method thereof
  • PdP/C catalyst for high-performance direct methanoic acid fuel cell and producing method thereof
  • PdP/C catalyst for high-performance direct methanoic acid fuel cell and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 10ml of water, add 31mgNaF and 125mgH 3 BO 3 , add 3.13ml 0.04504molL -1 PdCl 2 After ultrasonication for 10 minutes, add 60 mg of activated carbon and continue ultrasonication for 30 minutes to obtain PdCl 2 Adjust the pH of the suspension with activated carbon to 8-9 with ammonia water.

[0037] Take 10ml of water, add 0.0228mmol NaH 2 PO 2 , the above PdCl 2 The suspension with activated carbon was slowly added dropwise to NaH 2 PO 2 In the aqueous solution, continue to sonicate for 1 hour, and stir in a 90°C water bath for 6 hours to make the PdCl 2 with reducing agent NaH 2 PO 2 Total response.

[0038] The impurity ions were removed by washing twice with water for several times, and the PdP / C powder catalyst with a Pd metal loading of 20% was obtained by drying at 60° C. under vacuum condition.

[0039] Referring to Figure 1 to Figure 4:

[0040] Figure 1: Energy dispersive spectrum (EDS) of 20% PdP / C catalyst;

[0041] Figure 2: TEM photo of th...

Embodiment 2

[0045] 10ml water, add 25mg NH 4 F and 125 mg H 3 BO 3 , add 5.37ml 0.04504molL -1 PdCl 2 After ultrasonication for 10 minutes, add 60 mg of activated carbon and continue ultrasonication for 30 minutes to obtain PdCl 2 Suspension with activated charcoal.

[0046] Take 10ml of water, add 2mmol NaH 2 PO 2 and 2 mmol H 3 PO 2 , the above PdCl 2 Slowly add the suspension with activated carbon into the reducing agent aqueous solution, continue to sonicate for 1 hour, and stir in a water bath at 90°C for 6 hours to make the PdCl 2 Reacts completely with reducing agents. After cooling to room temperature, wash with suction and wash with water twice to remove impurity ions. 2 The PdP / C powder catalyst with a Pd metal loading of 30% was obtained by drying at 60°C under air protection.

Embodiment 3

[0048] 10ml water, add 44mg KF and 125mg H 3 BO 3 , add 8.37ml 0.04504molL -1 PdCl 2 After ultrasonication for 10 minutes, add 60 mg of activated carbon and continue ultrasonication for 30 minutes to obtain PdCl 2 Suspension with activated charcoal.

[0049] Take 10ml of water, add 3mmol NaH 2 PO 2 , 3 mmol H 3 PO 2 , 3mmol KH 2 PO 2 , the above PdCl 2 Slowly add the suspension with activated carbon into the reducing agent aqueous solution, continue to sonicate for 1 hour, and stir in a water bath at 90°C for 6 hours to make the PdCl 2 Reacts completely with reducing agents. After cooling to room temperature, it was filtered and washed, washed twice with water to remove impurity ions, and dried at 60°C under vacuum to obtain a PdP / C powder catalyst with a Pd metal loading of 40%.

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Abstract

This invention relates to a PdP / C catalyst of a high performance direct formic acid fuel battery including: loading Pd particles onto a carbon carrier, in which, the Pd particle is 1-80% that of the carbon carrier mass and the diameter is 3.0nm and contains a non-metal element P, the atomic ration of Pd and P is 8-12:1. The preparation method includes: adding a complexing agent, a stabilizing agent, PdCl2 and active carbon carrier to be oscillated with supersonic to get a component to be added by excessive reducer slowly, and the PdCl2 reacts with the reducer fully and P is introduced so that the recovered PdP particles are adsorbed on the carbon carrier to get component B, in which, introduction of P applies the following one or many reducers: H3PO2, KH2PO2, NaH2PO2 and Ca(H2PO2)2, the mol ratio of Pd and the reducer is 1:4-30, washing component B to be dried under vacuum or inert gas.

Description

technical field [0001] The invention relates to a catalyst, in particular to a PdP / C catalyst for a high-performance direct formic acid fuel cell—a carbon-supported ultrafine PdP catalyst; and a preparation method of the carbon-supported ultrafine PdP catalyst. Background technique [0002] In recent years, direct methanol fuel cells (DMFC) have developed rapidly in recent years. Methanol has high energy density as a fuel at room temperature, but there are still many technical problems due to methanol as a fuel, such as methanol is toxic and flammable, and methanol can pass through Nafion The diaphragm reaches the cathode chamber where oxidation etc. occurs on the cathode. [0003] People are trying to find more potential alternative fuels to replace methanol, and liquid formic acid solution is a potentially attractive liquid fuel. Formic acid has the following advantages over methanol: first, formic acid is a strong electrolyte, which is beneficial to increase the electron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92B01J23/42B01J3/00B01J37/00
CPCY02E60/50
Inventor 唐亚文陆天虹张玲玲
Owner NANJING NORMAL UNIVERSITY
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