Palladium-palladium-tungsten-chromium nano-catalyst and preparation method and application thereof
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A nano-catalyst and palladium salt technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve high repeatability, strong anti-Oswald ripening performance, high formic acid catalytic oxidation activity Effect
Active Publication Date: 2020-10-16
QINGDAO UNIV
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[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
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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 sonication -1 ), chromium acetate (0.2 mg mL -1 ) and tungsten carbonyl (2.5 mg mL -1 ) to obtain a mixed solution;
[0040] (2) Pour high-purity nitrogen into the mixed solution to remove dissolved oxygen, then heat up to 230°C for 2h;
[0041] (3) Centrifuge the product obtained in step (2), and wash it with an aqueous ethanol solution, to obtain a final product.
[0042] Detection and Analysis
[0043] 1) the palladium-palladium tungsten-chromium nanocatalyst that the present embodiment 1 makes is carried out transmission electron microscope detection and analysis, the result is as follows figure 1 shown.
[0044] from figure 1 It can be clearly observed that the prepared palladium-palladium tungsten-chromium nano-cata...
Embodiment 2
[0055] In the present embodiment, the preparation method of palladium-palladium tungsten-chromium nanocatalyst comprises the following steps:
[0056] (1) Under sonication, add sodium chloropalladate (1 mg·mL) to a solution of DMF (15 mL) and acetic acid (5 mL) -1 ), chromium acetate (0.25 mg mL -1 ) and tungsten carbonyl (4 mg mL -1 ) to obtain a mixed solution;
[0057] (2) feed high-purity nitrogen into the mixed solution to remove dissolved oxygen, then heat up to 300°C, and react for 70min;
[0058] (3) Centrifuge the product obtained in step (2), and wash it with an aqueous ethanol solution, to obtain a final product.
[0059] Detection and Analysis
[0060] 1) the palladium-palladium tungsten chromium nano-catalyst that the present embodiment 2 makes is carried out transmission electron microscope detection and analysis, the result is such as Figure 5 shown.
[0061] from Figure 5 It can be clearly observed that the prepared palladium-palladium tungsten-chromiu...
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Abstract
The invention discloses a palladium-palladium-tungsten-chromium nano-catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The palladium-palladium-tungsten-chromium nano-catalyst is composed of palladium of a layered heterostructure and palladium-tungsten-chromium nano-sheets, and is of a nano flower-shaped three-dimensional structure. The preparation method comprises the following steps: adding sodium chloropalladate, chromium acetate and tungsten carbonyl into an organic solvent, introducing inert gas, performing heating to react, and performing centrifuging and washing to obtain the product. According to the palladium-palladium-tungsten-chromium nano-catalyst provided by the invention, relatively high structural stability is maintained, and the relatively high Ostwald curing resistance of a two-dimensional material is combined, so the palladium-palladium-tungsten-chromium nano-catalyst shows relatively high cycling stability; thepreparation method is simple and convenient to operate, high in repeatability, safe, environment-friendly and suitable for large-scale production; compared with a commercial palladium/carbon catalyst, the catalyst has a larger electrochemical activity specific surface area, higher formic acid electrooxidation catalytic activity and excellent cycling stability, and has a higher practical value anda potential important application prospect.
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 crucial 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. Formic acid electro-oxidation reaction (FAOR) is an essential anode catalytic reaction for DFAFCs, and its relatively slow kinetics has become a bottleneck for the development of DFAFCs technology. At present, the commonly used catalyst for FAOR is palladium / carbon. However, its electrochemically active specific surface area is small, showing fewer catalytically active sites, and its electrocatalytic activity is far from practical application requirements; in addition, palladium nanoparticles have high surface energy ...
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