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High-efficiency silver-palladium nano-alloy formate oxidation reaction electrocatalyst and preparation method thereof

A technology of nano-alloy and oxidation reaction, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of not being suitable for large-scale practical applications, affecting battery durability, high cost, etc., to achieve Improve the poisoning problem, prolong the service life, and reduce the effect of usage

Inactive Publication Date: 2018-08-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, the electrocatalysts of direct formate fuel cells are mainly Pd / C and Pd-Au alloys. The pure Pd in ​​Pd / C is poisoned during the catalytic process, which will affect the durability of the battery.
Pd-Au nanoalloy has been proved to be a better catalyst, but its high cost is not suitable for large-scale practical application

Method used

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  • High-efficiency silver-palladium nano-alloy formate oxidation reaction electrocatalyst and preparation method thereof
  • High-efficiency silver-palladium nano-alloy formate oxidation reaction electrocatalyst and preparation method thereof
  • High-efficiency silver-palladium nano-alloy formate oxidation reaction electrocatalyst and preparation method thereof

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example 1

[0031] 1 g of 99% AgNO 3 Dissolved in 58.9mL deionized water, prepared as 0.1mol / L aqueous solution, 0.25g99% NaBH 4 Dissolve in 66mL of deionized water to prepare a 0.1mol / L aqueous solution. Take the above 1mL AgNO 3 aqueous solution and 5 mL NaBH 4 aqueous solution, the AgNO 3 The aqueous solution was added dropwise to NaBH 4 In aqueous solution, stir at room temperature for 2h until the reaction is complete. Then the solution was centrifuged (4000rpm, 3min), washed three times with plasma water, freeze-dried for 12h, and ground to obtain pure Ag catalyst. N 2 Electrochemical test results in saturated 1M KOH+1M KCOOH solution (see Figure 5 Curve 5) shows that there is an obvious Ag oxidation peak near 0.2v.

example 2

[0033] 1 g of 99% AgNO 3 Dissolved in 58.9mL deionized water to prepare a 0.1mol / L aqueous solution, 1g of 99% Pd(NO 3 ) 2 Dissolved in 43.1mL deionized water to prepare a 0.1mol / L aqueous solution, 0.25g 99% NaBH 4 Dissolve in 66mL of deionized water to prepare a 0.1mol / L aqueous solution. Take the above 0.75mL AgNO 3 aqueous solution, 0.25mL of Pd(NO 3 ) 2 aqueous solution and 5 mL NaBH 4 aqueous solution, the AgNO 3 Aqueous solution, Pd(NO 3 ) 2 The aqueous solution was mixed and stirred for 10 min and then added dropwise to NaBH 4 In aqueous solution, stir at room temperature for 2h until the reaction is complete. Then the solution was centrifuged (4000rpm, 3min), washed three times with plasma water, freeze-dried for 12h, and ground to obtain Pd 0.25 Ag 0.75catalyst. N 2 Electrochemical test results in saturated 1M KOH+1M KCOOH solution (see Figure 5 Curve 4) shows that in addition to the Ag oxidation peak, a formate oxidation peak appears near the -0.3v p...

example 3

[0035] 1 g of 99% AgNO 3 Dissolved in 58.9mL deionized water to prepare a 0.1mol / L aqueous solution, 1g of 99% Pd(NO 3 ) 2 Dissolved in 43.1mL deionized water to prepare a 0.1mol / L aqueous solution, 0.25g 99% NaBH 4 Dissolve in 66mL of deionized water to prepare a 0.1mol / L aqueous solution. Take the above 0.5mL AgNO 3 aqueous solution, 0.5 mL of Pd(NO 3 ) 2 aqueous solution and 5 mL NaBH 4 aqueous solution, the AgNO 3 Aqueous solution, Pd(NO 3 ) 2 The aqueous solution was mixed and stirred for 10 min and then added dropwise to NaBH 4 In aqueous solution, stir at room temperature for 2h until the reaction is complete. Then the solution was centrifuged (4000rpm, 3min), washed three times with plasma water, freeze-dried for 12h, and ground to obtain Pd 0.5 Ag 0.5 catalyst. N 2 Electrochemical test results in saturated 1M KOH+1M KCOOH solution (see Figure 5 Curve 3) shows that there is an obvious formate oxidation peak between -0.4V—-0.3V, and the peak current dens...

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Abstract

The invention relates to a high-efficiency silver-palladium nano-alloy formate oxidation reaction electrocatalyst and a preparation method thereof. A PdAg nano-alloy prepared by doping Pd with Ag by aco-reduction method can be used for the formate oxidation catalytic process under alkaline conditions, the usage amount of Pd is reduced to a great extent by the doping of Ag, and the cost is reduced. Furthermore, by the doping of Ag, the poisoning problem of Pd is improved, and the service life of the material is prolonged. The reaction is carried out in an aqueous solution without heating, andthe process is simple. By comparing the effects of different Ag doping amounts: pure Ag, 0.25 of Pd and 0.75 of Ag, 0.5 of Pd and 0.5 of Ag, 0.75 of Pd and 0.25 of Ag, and pure Pd, a large current canbe maintained when the content of Ag is 50%, which indicates that the usage amount of Pd can be reduced within an appropriate range by the doping of Ag while high catalytic activity is ensured, and the cost reduction requirement is met.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a high-efficiency silver-palladium nano-alloy formate oxidation reaction electrocatalyst and a preparation method thereof, in particular to a direct liquid fuel cell formate oxidation reaction electrocatalyst and a preparation method thereof. Background technique [0002] Fuel cells have become one of the promising candidate energy sources due to their high efficiency, high energy density, and low emissions. Compared with other fuel cells, direct liquid fuel cells are expected to develop as a clean and efficient energy production technology to replace existing fossil energy technologies. [0003] Direct liquid fuel cells can be divided into direct methanol fuel cells, direct ethanol fuel cells, and direct formic acid fuel cells. It is an alkaline solution, which can work without adding alkali, and is a research and development hotspot among many liquid fuel cells. Direct forma...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88B82Y30/00H01M8/1009
CPCB82Y30/00H01M4/88H01M4/921H01M8/1009Y02E60/50
Inventor 陈福义王小璐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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