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AgPd nano-alloy formate oxidation catalyst and treatment method of non-surfactant for improving catalytic activity

A technology of oxidation catalyst and nano-alloy, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of inhibiting catalytic activity and the performance of Pd-based catalysts is not obvious, and achieve the effect of improving catalytic performance and FOR catalytic performance

Active Publication Date: 2018-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a AgPd nano-alloy formate oxidation catalyst and a surfactant-free treatment method for improving catalytic activity, so as to solve the problem that Ag alloying improves the FOR performance of Pd-based catalysts, and Residual organic surfactants can inhibit catalytic activity and other two problems

Method used

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  • AgPd nano-alloy formate oxidation catalyst and treatment method of non-surfactant for improving catalytic activity
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  • AgPd nano-alloy formate oxidation catalyst and treatment method of non-surfactant for improving catalytic activity

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example 1

[0043] 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 AgNO 3 Aqueous solution, Pd(NO 3 ) 2 The aqueous solution was mixed and stirred for 10 minutes (volume ratio 3:1) and 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 0.34 Ag 0.66 catalyst. Weigh 2mg Pd 0.34 Ag 0.66 The catalyst is dispersed in a mixed solution of deionized water and absolute ethanol, 20 microliters of 5% membrane solution is added dropwise, ultrasonicated for 30 minutes, and then coated on a glassy carbon electrode, and dried at room temperature. In the ...

example 2

[0045] Take the above AgNO 3 Aqueous solution, Pd(NO 3 ) 2 The aqueous solution was mixed and stirred for 10 minutes (volume ratio 1:1) and 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. Weigh 2mg Pd 0.5 Ag 0.5 The catalyst is dispersed in a mixed solution of deionized water and absolute ethanol, 20 microliters of 5% membrane solution is added dropwise, ultrasonicated for 30 minutes, and then coated on a glassy carbon electrode, and dried at room temperature. In the lower electrode potential interval -0.8-0.2V (relative to the Hg / HgO electrode), a cyclic voltammetry scan was performed at a scan rate of 50mV / s to measure the FOR performance (see image 3 Curve 1). On this basis, the electrode potential range was expanded to -0.8-0.5V (relative to the Hg / ...

example 3

[0047] Take the above AgNO 3 Aqueous solution, Pd(NO 3 ) 2 The aqueous solution was mixed and stirred for 10 minutes (volume ratio 3:1) and 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 0.66 Ag 0.34 catalyst. Weigh 2mg Pd 0.66 Ag 0.34 The catalyst is dispersed in a mixed solution of deionized water and absolute ethanol, 20 microliters of 5% membrane solution is added dropwise, ultrasonicated for 30 minutes, and then coated on a glassy carbon electrode, and dried at room temperature. In the lower electrode potential interval -0.8-0.2V (relative to the Hg / HgO electrode), a cyclic voltammetry scan was performed at a scan rate of 50mV / s to measure the FOR performance (see Figure 4 Curve 1). On this basis, the electrode potential range was expanded to -0.8-0.5V (relative to th...

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Abstract

The invention relates to an AgPd nano-alloy formate oxidation catalyst and treatment method of non-surfactant for improving catalytic activity. An in-situ electrochemical potential cycle method is applied to improving the AgPd nano-alloy formate oxidation catalytic activity on the basis of the alloyed Pd-based nano-structure FOR catalytic performance; the electrochemical potential cycle can causethe reconstruction of the metal electrode surface, thereby playing the effect of modifying the surface chemistry and catalysis of the catalyst; and meanwhile, the active agent cannot be introduced, and the nano-alloy FOR catalytic performance is secondarily improved. The AgPd nano-alloy formate oxidation catalyst disclosed by the invention has the advantage that the modification on the catalyst surface structure can be realized by only circulating voltammetry scanning at the 0.2-0.5V electrode potential interval, the FOR catalytic performance of the Ag-Pd catalyst is greatly improved without adding the organic surface active additive.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to the preparation of an AgPd nano-alloy formate oxidation catalyst and a method for improving its activity, in particular to an AgPd nano-alloy formate oxidation catalyst and a surfactant-free treatment method for improving catalytic activity . Background technique [0002] Due to the advantages of high electromotive force and satisfactory power density, direct formic acid fuel cells have been paid more and more attention by scholars. Compared with acidic working conditions (formic acid), the kinetics of the oxidation reaction under alkaline conditions (formate solution is an alkaline solution) is faster and the poisoning phenomenon is weaker, which avoids the problems that have always been faced in the oxidation of alcohol and formic acid. A lot of research has been done on the formate fuel cell system, but the research on catalysts for the formate oxidation (FOR) process is rel...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/90Y02E60/50
Inventor 陈福义王小璐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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