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Self-assembled pd-cu bimetallic multi-dendritic nanocrystalline catalyst and its preparation and use

A bimetallic and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, nanotechnology, etc., can solve problems such as no clear physical mechanism, achieve mild preparation conditions and simple method , the effect of convenient operation

Active Publication Date: 2019-05-03
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The model captures the key components of a wide range of natural phenomena with extremely simple algorithms but has no clear physical mechanism;

Method used

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  • Self-assembled pd-cu bimetallic multi-dendritic nanocrystalline catalyst and its preparation and use
  • Self-assembled pd-cu bimetallic multi-dendritic nanocrystalline catalyst and its preparation and use
  • Self-assembled pd-cu bimetallic multi-dendritic nanocrystalline catalyst and its preparation and use

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: multi-dendritic palladium-copper bimetallic nanocrystal catalyst Pd 12.1 The preparation method of Cu

[0018] First, add 1.7mg copper chloride dihydrate, 87mg sodium dodecylbenzenesulfonate, and 352.2mg ascorbic acid into a 15ml wall-thick pressure-resistant bottle, add water to dissolve completely, and the total volume is 5mL. Then transfer to an 80°C oil bath and heat for 18h. After the reaction is completed, cool to room temperature, ultrasonicate for 5min to form a uniform copper sol, add 24mg of potassium bromide, stir for 5min, then transfer to a constant temperature water bath at 15°C, and use 0.043L / h Injection speed 5 mL of 10 mmol / L chloropalladium acid (containing 44.3 mg of palladium chloride and 1.25 mmol of aqueous hydrochloric acid) was added to the copper sol. After reacting for 2 hours, wash 3 times with a mixed solution of water and ethanol, and dry for later use.

Embodiment 2

[0019] Embodiment 2: Reaction steps of ethanol electrocatalytic oxidation

[0020] Preparation of electrodes: Electrochemical tests were performed in a three-electrode glass electrolytic cell. The working electrode is to drop the dispersed liquid of the catalyst in ultrapure water on the glassy carbon electrode (glassy carbon electrode, diameter 6mm, glassy carbon surface 3mm, area 0.07cm 2 ), dry naturally, drop 0.02% Nafion solution onto the surface of the catalyst, and dry it. The platinum wire is the counter electrode, and the reference electrode is Ag / AgCl.

[0021] Electrochemical performance test: at N 2 Cyclic voltammetry scanning was carried out in a saturated 1M NaOH solution with a scanning speed of 50mV·s -1 , the scanning range is -0.9 ~ 0.5V, after the curve is stable, the electrochemical active area is calculated. after N 2 Ethanol electrooxidation performance test was carried out in a saturated 1M EtOH+1M KOH solution, and the scanning speed was 50mV s -1 ...

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Abstract

The invention provides a self-assembled Pd-Cu bimetal multi-dendritic nanocrystal catalyst as well as its preparation and application. The key of its preparation method is: use heterogeneous Cu species to induce the nucleation of Pd species, and regulate the morphology of Pd-based nanocrystals under the condition of sodium dodecylbenzenesulfonate with weak protective power as the protective agent. This catalyst is the first example of self-assembled Pd-Cu bimetallic nanocrystals based on the formation mechanism of diffusion-limited condensation. The catalyst exhibits high catalytic activity and stability for the electrocatalytic oxidation of ethanol. Moreover, the method has the characteristics of simple process, low cost, convenient operation, good application effect and the like.

Description

technical field [0001] The invention belongs to the field of material synthesis of nano crystals. Specifically, it is the shape control of noble metal Pd. Background technique [0002] The formation mechanism of the nanocrystal is diffusion-limited aggregation (Diffusion-limited Aggregation, DLA). This model was jointly proposed by Witten and Sander in 1981. Randomly generate a particle at any position of , and make it walk randomly until it contacts the seed and becomes a part of the group; then randomly generate a particle, and repeat the above process, so that a large enough DLA cluster can be obtained. Sander, one of the founders, once summed up the research significance of DLA: [0003] The model captures the key components of a wide range of natural phenomena with extremely simple algorithms but has no clear physical mechanism; [0004] A self-similar fractal structure with scale invariance can be produced through simple kinematics and dynamics processes, thus estab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C25B11/06C25B3/02B82Y30/00C25B3/23
CPCB82Y30/00B01J23/8926C25B3/23C25B11/081B01J35/23
Inventor 沈闽曹荣黄远标李红芳
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI