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Flower-shaped AgPd nanometer alloy and preparing and using method

A nano-alloy, flower-like technology, applied in chemical instruments and methods, nanotechnology, metal processing equipment, etc., can solve the problems of high cost, insignificant Pd-M alloying effect, and insufficient electrocatalytic activity, and achieve catalytic Increased activity, excellent catalytic activity and stability, avoiding the effect of high temperature calcination

Active Publication Date: 2018-11-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Pd-M alloying effect of the electrocatalytic performance of formate oxidation reaction is not significant, the electrocatalytic activity is not good enough, the cost is too high, and it is difficult to meet the needs of current commercial fuel cells and other problems in the existing technology

Method used

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  • Flower-shaped AgPd nanometer alloy and preparing and using method
  • Flower-shaped AgPd nanometer alloy and preparing and using method
  • Flower-shaped AgPd nanometer alloy and preparing and using method

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Experimental program
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Effect test

Embodiment 1

[0057] This embodiment is a pure Pd catalyst. The electrochemical specific surface area of ​​the pure Pd catalyst is 4.64 m 2 / g, the current density can reach 8.52mA / cm at 0.69Vvs.RHE 2 . Under simulated sunlight, the oxidation peak current of pure Pd catalyst is from 8.52mA / cm 2 Increase to 9.11mA / cm 2 . The preparation process of this embodiment is as follows:

[0058] (1) Weigh 0.0348 g of Apzc into 6.9 mL of distilled water, stir magnetically until it is fully dissolved. Then add 2mL Na to the stirring Apzc solution 2 PdCl 4 (20mmol / L), magnetically stirred at room temperature for 5 min. Wherein the concentration of Apzc is 25mmol / L, Na 2 PdCl 4 The concentration is 4mmol / L.

[0059] (2) Quickly inject 1 mL of ascorbic acid solution (0.1 mol / L) into the precursor solution obtained in step (1), and stir and react for 1 hour at room temperature. Then 0.1 mL of hydrazine hydrate (80 wt%) was added, and the reaction was continued to stir for 30 min.

[0060] (3) Centrifugal sepa...

Embodiment 2

[0064] This embodiment is an Ag 25 Pd 75 Nano alloy catalyst, Ag 25 Pd 75 The content of silver in the nano-alloy catalyst is 26%, and the content of palladium is 74%, and the percentages are atomic percentages. Ag 25 Pd 75 The electrochemical specific surface area of ​​the nano-alloy catalyst is 3.79m 2 / g, the current density at 0.71V vs. RHE is 18.98mA / cm 2 . The preparation process of this embodiment is as follows:

[0065] (1) Weigh 0.0348 g of Apzc into 6.9 mL of distilled water, stir magnetically until it is fully dissolved. Then add 1.5mL Na to the stirring Apzc solution 2 PdCl 4 (20mmol / L) and 0.5mL AgNO 3 (20mmol / L), magnetically stirred at room temperature for 5 min. Wherein, the concentration of Apzc is 25mmol / L, Na 2 PdCl 4 The concentration is 3mmol / L, AgNO 3 The concentration is 1mmol / L.

[0066] (2) Quickly inject 1 mL of ascorbic acid solution (0.1 mol / L) into the precursor solution obtained in step (1), and stir and react for 1 hour at room temperature. Then 0....

Embodiment 3

[0071] This embodiment is an Ag 50 Pd 50 Nano alloy catalyst, Ag 50 Pd 50 The average particle size of the nano-alloy catalyst is 320nm, the dispersion is good, the morphology is flower-like, Ag 50 Pd 50 The content of silver in the nano-alloy catalyst is 51%, and the content of palladium is 49%, and the percentages are atomic percentages. Ag 25 Pd 75 The electrochemical specific surface area of ​​the nano-alloy catalyst is 10.37m 2 / g, the current density at 0.74V vs. RHE is 26.16mA / cm 2 . Under simulated sunlight, Ag 50 Pd 50 The oxidation peak current of the nano-alloy catalyst is from 26.16mA / cm 2 Increase to 30.97mA / cm 2 . The preparation process of this embodiment is as follows:

[0072] (1) Weigh 0.0348 g of Apzc into 6.9 mL of distilled water, stir magnetically until it is fully dissolved. Then add 1mL Na to the stirring Apzc solution 2 PdCl 4 (20mmol / L) and 1mL AgNO 3 (20mmol / L), magnetically stirred at room temperature for 5 min. Wherein, the concentration of Apzc is ...

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Abstract

The invention relates to a flower-shaped AgPd nanometer alloy and a preparing and using method. A solution co-reduction method is utilized for preparing a flower-shaped PdAg nanometer alloy catalyst,cheap Ag is introduced to serve as an alloying element, ascorbic acid and hydrazine hydrate are used as reducing agents, Apzc is used as a shape control agent, the average particle size of the prepared AgPd nanometer alloy catalyst is 320 nm, dispersity is good, the shape likes the flower, the content of silver in the AgPd nanometer alloy catalyst is 25-75%, the content of palladium is 25-75%, andthe atomic percent is adopted as the percent. The electrochemistry specific surface area of the flower-shaped AgPd nanometer alloy catalyst is 3.79-10.37 m2 / g, the flower-shaped AgPd nanometer alloycatalyst has excellent catalytic activity and stability, and the current density at 0.7V vs.RHE is 1.75-26.16 mA / cm2. Under simulation of sun illumination, oxidation peak currents of prepared pure Pdand the Ag50Pd50 nanometer alloy catalyst are improved from 8.52 mA / cm2 to 9.11 mA / cm2 and from 26.16 mA / cm2 to 30.97 mA / cm2 correspondingly.

Description

Technical field [0001] The invention belongs to the technical field of electrocatalysis and photocatalysis, and relates to a flower-shaped AgPd nano-alloy and a preparation and use method, in particular to a flower-shaped AgPd nano-alloy and its application in formate oxidation reaction electrocatalysis and surface plasma catalysis. Background technique [0002] Liquid fuel cells can efficiently convert chemical energy into electrical energy, have the characteristics of high specific energy, convenient fuel transportation and environmental friendliness, and can play a huge application potential in the fields of portable power supplies and electric vehicles. Among them, direct formic acid fuel cells using liquid formic acid as fuel have received increasing attention due to their high open circuit voltage, low toxicity and low fuel permeability. One of the key factors affecting the performance of direct formic acid fuel cells is the oxidation reaction of formic acid. Compared with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B01J23/50B01J35/00B01J35/02B82Y40/00
CPCB82Y40/00B01J23/50B22F9/24B22F1/0553B22F1/054B01J35/33B01J35/50B01J35/40
Inventor 陈福义王俏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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