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Preparation of a palladium hydrogen nanoparticle and its application in electrocatalytic oxidation of formic acid

A nanoparticle and reaction vessel technology, applied in the field of palladium hydrogen nanocatalytic materials, can solve the problems of unadjustable Pd and H ratio, limited application, insufficient stability of PdH, etc., achieve superior catalytic activity, improve catalytic activity, and reduce oxidation overpotential Effect

Active Publication Date: 2020-10-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, these in situ generated PdH are not stable enough, and the ratio of Pd to H cannot be adjusted, thus limiting their wider applications.

Method used

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  • Preparation of a palladium hydrogen nanoparticle and its application in electrocatalytic oxidation of formic acid
  • Preparation of a palladium hydrogen nanoparticle and its application in electrocatalytic oxidation of formic acid
  • Preparation of a palladium hydrogen nanoparticle and its application in electrocatalytic oxidation of formic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In a 25 mL reactor, 5 mg of commercial Pd black and 10 mL of n-butylamine were mixed evenly, and then the reactor containing the reaction solution was placed in an oven, and the temperature was raised from room temperature to 150 °C and kept at a constant temperature for 5.0 h, and then cooled down to room temperature naturally. Finally, all the products were collected by centrifugation, and the samples were washed with ethanol several times to remove the adhesive on the surface. Its phase analysis is a β-phase palladium hydrogen compound, which belongs to the face-centered cubic structure, and the X-ray powder diffraction is as follows: figure 1 , 3 ~5 shown.

Embodiment 2

[0026] In a 25 mL reactor, 5 mg of commercial Pd black and 10 mL of n-butylamine were mixed evenly, and then the reactor containing the reaction solution was placed in an oven, and the temperature was raised from room temperature to 220 °C and kept at a constant temperature for 5.0 h, and then cooled down to room temperature naturally. Finally, all the products were collected by centrifugation, and the samples were washed with ethanol several times to remove the adhesive on the surface. Its phase analysis is identical with embodiment 1, and corresponding X-ray powder diffraction is as figure 2 shown.

Embodiment 3

[0028] In a 25 mL reactor, 5 mg of commercial Pd black and 10 mL of n-butylamine were mixed evenly, and then the reactor containing the reaction solution was placed in an oven, and the temperature was raised from room temperature to 130 °C and kept at a constant temperature for 5.0 h, and then cooled down to room temperature naturally. Finally, all the products were collected by centrifugation, and the samples were washed with ethanol several times to remove the adhesive on the surface. Its phase analysis is the same as in Example 1, and the ratio of H and Pd in ​​its palladium hydride sample is 0.33. The corresponding X-ray powder diffraction figure 2 shown.

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Abstract

The invention discloses a preparation of palladium hydrogen nano particles and its application in electrocatalytic oxidation of formic acid, which relates to a palladium hydrogen nano catalytic material. Mix the Pd nanoparticles with the solvent in the reaction vessel; after heating the reaction vessel, cool down and collect the product, wash the sample with ethanol to remove the adhesive on the surface, and after vacuum drying, control the reaction temperature to obtain PdH x compound. The palladium hydrogen nanoparticles are applied in the electrocatalytic oxidation of formic acid, and the palladium hydrogen nanoparticles can use a β-phase palladium hydrogen catalyst, and the β-phase palladium hydrogen catalyst can be applied in a fuel cell. The preparation method is simple, the reaction conditions are mild, and the palladium nanoparticles can be directly formed into stable palladium hydrogen after heat treatment. The β-phase palladium hydrogen catalyst can be cleaned by ethanol centrifugal cleaning or ozone ultraviolet cleaning, and a clean surface can be obtained. By adjusting the reaction temperature, palladium hydrogen nanocatalysts with different H ratios were obtained.

Description

technical field [0001] The invention relates to a palladium-hydrogen nano-catalysis material, in particular to the preparation of a palladium-hydrogen nano-particle and its application in electrocatalytic oxidation of formic acid. Background technique [0002] Palladium (Pd) is a very important noble metal catalyst with wide applications in many fields. In particular, Pd has a strong adsorption capacity for H2, forming a unique PdH compound, which exhibits excellent properties in hydrogen storage, sensing, and hydrogen purification (Adams Brian D., Chen Aicheng. The role of palladium in ahydrogen economy. Materials Today, 2011, 14(6):282-289). Exposing Pd to a H2 atmosphere, or giving a negative potential in an electrochemical system is a conventional method for synthesizing PdH compounds in the past (Li G., Kobayashi H., Dekura S., Ikeda R., Kubota Y., Kato K. ,Takata M.,Yamamoto T.,Matsumura S.,Kitagawa H.Shape-dependent hydrogen-storage properties in pd nanocrystals:Whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/12B01J37/08B01J35/02C25B11/06C25B3/02H01M4/88H01M4/90B01J35/00C25B3/23
CPCH01M4/8882H01M4/9091H01M4/928C25B11/04B01J31/121B01J37/08B01J2231/70C25B3/23B01J35/40B01J35/50Y02E60/50
Inventor 谢兆雄陈梅珊张嘉伟
Owner XIAMEN UNIV
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