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A kind of palladium-palladium tungsten chromium nano catalyst and its preparation method and application

A technology of nano-catalyst and palladium salt, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve good stability, high practical value, and high repeatability

Active Publication Date: 2022-03-18
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to overcome the defect that existing palladium nanosheet catalyst exists, and a kind of palladium-palladium tungsten chromium nanocatalyst and its preparation method and application are provided

Method used

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  • A kind of palladium-palladium tungsten chromium nano catalyst and its preparation method and application
  • A kind of palladium-palladium tungsten chromium nano catalyst and its preparation method and application
  • A kind of palladium-palladium tungsten chromium nano catalyst and its preparation method and application

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Embodiment 1

[0038] In the present embodiment, the preparation method of palladium-palladium tungsten chromium nanocatalyst comprises the following steps:

[0039] (1) Add sodium chloropalladate (0.75 mg·mL) to a solution of DMF (12 mL) and acetic acid (8 mL) under ultrasonic conditions -1 ), chromium acetate (0.2mg·mL -1 ) and tungsten carbonyl (2.5mg·mL -1 ), making a mixed solution;

[0040] (2) Pass high-purity nitrogen into the mixed solution to remove dissolved oxygen, then heat up to 230° C., and react for 2 hours;

[0041] (3) Centrifuge the product obtained in step (2), wash it with ethanol aqueous solution, and obtain it.

[0042] Detection and Analysis

[0043] 1) the palladium-palladium tungsten chromium nanocatalyst that present embodiment 1 makes is carried out transmission electron microscope detection analysis, and the result is as follows figure 1 shown.

[0044] from figure 1 It can be seen from the analysis that the prepared palladium-palladium tungsten-chromium n...

Embodiment 2

[0055] In the present embodiment, the preparation method of palladium-palladium tungsten chromium nanocatalyst comprises the following steps:

[0056] (1) Add sodium chloropalladate (1mg·mL) to a solution of DMF (15mL) and acetic acid (5mL) under ultrasonic conditions -1 ), chromium acetate (0.25mg·mL -1 ) and tungsten carbonyl (4mg·mL -1 ), making a mixed solution;

[0057] (2) Pass high-purity nitrogen into the mixed solution to remove dissolved oxygen, then heat up to 300°C and react for 70 minutes;

[0058] (3) Centrifuge the product obtained in step (2), wash it with ethanol aqueous solution, and obtain it.

[0059] Detection and Analysis

[0060] 1) the palladium-palladium tungsten chromium nano-catalyst that present embodiment 2 makes is carried out transmission electron microscope detection analysis, and the result is as follows Figure 5 shown.

[0061] from Figure 5 It can be seen from the analysis that the prepared palladium-palladium tungsten-chromium nanoc...

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Abstract

The invention discloses a palladium-palladium tungsten-chromium nano catalyst, a preparation method and an application thereof, and belongs to the technical field of catalysts. The palladium-palladium tungsten-chromium nanocatalyst is composed of palladium and palladium-tungsten-chromium nanosheets with layered heterostructure, and has a nanoflower-like three-dimensional structure. The preparation method is as follows: adding sodium chloropalladate, chromium acetate and tungsten carbonyl to the organic solvent, feeding inert gas, heating for reaction, centrifuging and washing to obtain the product. The palladium-palladium tungsten-chromium nano-catalyst provided by the present invention maintains high structural stability, and at the same time, combines the strong anti-Oswald ripening performance of the two-dimensional material itself, so that it exhibits high cycle stability ; and the preparation method is easy to operate, highly repeatable, safe and environmentally friendly, and suitable for large-scale production; compared with commercial palladium / carbon catalysts, it has larger electrochemically active specific surface area, higher formic acid electro-oxidation catalytic activity and excellent cycle Stability, high practical value and potential important application prospects.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a palladium-palladium tungsten-chromium nano-catalyst and a preparation method and application thereof. Background technique [0002] Electrocatalysts play a vital role in high-performance electrochemical energy conversion devices. Direct formic acid fuel cells (DFAFCs) have great potential for applications in portable electronic devices and electric vehicles. The formic acid electrooxidation reaction (FAOR) is an essential anode catalytic reaction of DFAFCs, and its relatively slow kinetics has become a bottleneck in the development of DFAFCs technology. For now, the catalyst commonly used by FAOR is palladium / carbon. However, the specific surface area of ​​its electrochemical activity is small, showing fewer catalytic active sites, and its electrocatalytic activity is far from the requirements of practical applications; in addition, palladium nanoparticles have high surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M8/1009B82Y30/00B82Y40/00
CPCH01M4/921H01M8/1009B82Y30/00B82Y40/00Y02E60/50Y02P70/50
Inventor 张连营王硕
Owner QINGDAO UNIV
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