Nano-palladium alloy catalyst for electrocatalytic reduction of CO2 as well as preparation method and application of nano-palladium alloy catalyst
An alloy catalyst and nano-alloy technology, which is applied in the fields of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, can solve the problems of slow reaction speed, high energy consumption of formic acid, bad by-products, etc., and achieve stable efficiency. , Solve the effect of active decay and strong controllability
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Embodiment 1
[0033] Example 1: Preparation of PdAg nanoparticles by wet chemical reduction method
[0034] Put 100 mg dimethyldihexadecyl ammonium chloride in a 50 mL beaker, add 20 mL distilled water, 6 mg AgNO 3 and 10 mg H 2 PdCl 4 , then the solution was transferred to a round-bottomed flask, Ar was introduced, and the reaction temperature was adjusted to 50 °C, followed by adding 10 mg of NaBH to the flask 4 , after reacting at 50 °C for 1 h, naturally cooled to room temperature in the air, poured the solution into a centrifuge tube, centrifuged at 10,000 rpm for 40 minutes, washed with isopropanol, ethanol and deionized water and freeze-dried After treatment, PdAg-1 nanoparticles were obtained. As a catalyst, the ratio of Pd to Ag was 4:1.
[0035] from figure 1 a It can be seen that the size of PdAg-1 nanoparticles is 6-7 nm, figure 1 The X-ray diffraction pattern in b shows that the diffraction peaks of PdAg-1 nanoparticles are located between the corresponding peaks of pure P...
Embodiment 2
[0036] Example 2: Preparation of PdAg nanowires by wet chemical reduction
[0037] Weigh 100 mg of dimethyldihexadecyl ammonium chloride in a 50 mL beaker, add 20 mL of distilled water and stir well, weigh 18 mg of AgNO 3 and 10 mg freshly formulated H 2 PdCl 4 Add to the beaker and mix well, then transfer the solution to a round-bottomed flask, pass Ar, and adjust the reaction temperature to 90 °C, then add 60 mg of ascorbic acid to the flask, react at 90 °C for 1 h, and then in air The solution was naturally cooled to room temperature, and the solution was poured into a centrifuge tube, centrifuged at 10,000 rpm for 40 minutes, washed with isopropanol, ethanol and deionized water and freeze-dried to obtain PdAg nanowires. The ratio of Pd to Ag is 3:1.
[0038] The crystal structure of the as-prepared PdAg nanowires was analyzed by powder X-ray diffraction. The catalyst has a face-centered cubic structure, and its single peak is located between pure Pd and pure Ag ( figu...
Embodiment 3
[0039] Example 3: Preparation of PdAg nanocubes by wet chemical reduction
[0040] Weigh 50 mg of dimethyldihexadecyl ammonium chloride in a 25 mL beaker, add 10 mL of distilled water and stir well, weigh 5 mg KCl, 8 mg AgNO 3 and 20 mg of freshly formulated H 2 PdCl 4 Add to the beaker and mix well, then transfer the solution to a round-bottomed flask, pass Ar, and adjust the reaction temperature to 70 °C, then add 35 mg of ascorbic acid to the flask, and react at 50 °C for 30 min. The solution was naturally cooled to room temperature, and the solution was poured into a centrifuge tube, centrifuged at 10,000 rpm, washed with ethanol and deionized water, and freeze-dried to obtain PdAg-2 nanocubes with a ratio of Pd to Ag of 2.7:1.
[0041] The as-prepared PdAg-2 nanocubes were observed under the scanning electron microscope ( image 3 a) is a rounded cube morphology with an average size of ~100 nm, powder X-ray diffraction pattern ( image 3 b) show at 30-90 o The diffra...
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