Carbon-supported palladium copper tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells and preparation method thereof

A formic acid fuel cell and electrocatalyst technology, which is applied in nanotechnology, fuel cells, battery electrodes and other directions for materials and surface science, can solve problems such as poisoning, achieve simple and controllable operation, improve adsorption, and avoid agglomeration effects.

Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering that it is a noble metal and is easily poisoned by carbon monoxide, it is necessary to further improve the catalytic activity and stability of palladium (Pd) catalysts to achieve high efficiency and low cost to meet the requirements of future commercialization
Therefore, it is necessary to develop catalysts with high catalytic activity, stability and low cost. However, the palladium-based and tantalum nitride composite catalysts have not been reported for the oxidation of methanol and formic acid.

Method used

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  • Carbon-supported palladium copper tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells and preparation method thereof
  • Carbon-supported palladium copper tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells and preparation method thereof
  • Carbon-supported palladium copper tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, a method for preparing a carbon-supported palladium-copper tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells, 135 mg of tantalum nitride, 67.5 mg of conductive carbon black and 33.75 mL of ethylene glycol are added to the container, and placed Stir on a magnetic stirrer for 15 minutes, and ultrasonically treat for 120 minutes, so that tantalum nitride and conductive carbon black are uniformly dispersed in ethylene glycol, and mixture A is obtained.

[0029] Add 4.9 mg of sodium chloropalladate, 0.5 mg of copper chloride and 40 mg of sodium citrate to 8 mL of the above mixture A, place it on a magnetic stirrer and stir for 30 minutes, then raise the temperature to 120°C and stir for 5 hours, wherein sodium chloropalladate and chlorine Copper chloride is reduced to metal palladium and copper respectively to obtain a solid-liquid mixture, which is then cooled to room temperature.

[0030] Wash the solid-liquid mixture ...

Embodiment 2

[0035] In this embodiment, a method for preparing a carbon-supported palladium tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells, 135mg tantalum nitride, 67.5mg conductive carbon black and 33.75mL ethylene glycol are added to the container, and placed in Stir on a magnetic stirrer for 30 minutes, and ultrasonically treat for 120 minutes, so that tantalum nitride and conductive carbon black are uniformly dispersed in ethylene glycol, and mixture A is obtained.

[0036] Add 4.9 mg of sodium chloropalladate and 40 mg of sodium citrate to 8 mL of the above mixture A, place on a magnetic stirrer and stir for 30 minutes, then raise the temperature to 120 ° C and stir for 5 hours, wherein the sodium chloropalladate is reduced to metal palladium to obtain solid liquid mixture, and then cooled to room temperature.

[0037]Wash the solid-liquid mixture cooled to room temperature with deionized water and absolute ethanol until no ethylene glycol, sodium...

Embodiment 3

[0040] In this embodiment, a method for preparing a carbon-supported palladium-copper tantalum nitride nano-electrocatalyst for direct methanol and formic acid fuel cells, 135 mg of tantalum nitride, 67.5 mg of conductive carbon black and 33.75 mL of ethylene glycol are added to the container, and placed Stir on a magnetic stirrer for 20 minutes, and ultrasonically treat for 60 minutes, so that tantalum nitride and conductive carbon black are uniformly dispersed in ethylene glycol, and mixture A is obtained.

[0041] Add 4.9mg of sodium chloropalladate, 0.5mg of copper chloride and 40mg of sodium citrate to 8mL of the above mixture A, place it on a magnetic stirrer and stir for 30min, then raise the temperature to 100°C and stir for 6h, in which sodium chloropalladate and chlorine Copper chloride is reduced to metal palladium and copper respectively to obtain a solid-liquid mixture, which is then cooled to room temperature.

[0042] Wash the solid-liquid mixture cooled to room...

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Abstract

The invention discloses a carbon-supported palladium copper tantalum nitride nanometer electrocatalyst for direct methanol and formic acid fuel cells and a preparation method thereof. The palladium, copper, tantalum nitride and conductive carbon black components of the catalyst are contained in the catalyst The mass percentages accounted for are 3-10%, 0-10%, 15-70% and 15-70%, and the preparation method is to prepare dispersed carbon-supported PdCu@ TaN / C nanoelectrocatalyst. The invention is the first preparation of a conductive carbon black-supported tantalum palladium nitride-based electrocatalyst, and the preparation method has mild conditions, simple and controllable operation, energy saving and environmental protection. The electrocatalyst of the present invention is used as a direct methanol and formic acid fuel cell anode material for the first time, and compared with commercial catalysts, the amount of noble metal is significantly reduced, and has high electrocatalytic activity for the oxidation reaction of methanol under alkaline conditions and formic acid under acidic conditions ( 6.3 and 4.9 times the catalytic activity of commercial palladium carbon, respectively), strong anti-CO poisoning ability and other advantages.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrocatalysts, in particular to a carbon-supported palladium copper tantalum nitride nanometer electrocatalyst for direct methanol and formic acid fuel cells and a preparation method thereof. Background technique [0002] With the energy crisis and environmental pollution, fuel cells have been widely regarded as the most promising and environmentally friendly green energy. Small organic molecule fuel cells such as methanol and formic acid have attracted extensive attention due to their high specific energy and low operating temperature. In a fuel cell, one of its key materials is an electrode catalyst. Many reports have shown that palladium is an effective catalyst for methanol oxidation reaction (MOR) in alkaline medium and formic acid oxidation reaction (FAOR) in acidic medium. However, considering that it is a noble metal and is easily poisoned by carbon monoxide, it is necessary to furt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/92H01M8/1009H01M8/1011B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8657H01M4/926H01M8/1009H01M8/1011Y02E60/50Y02P70/50
Inventor 姜召野娜方涛
Owner XI AN JIAOTONG UNIV
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