Method for synthesizing nitrogen-doped carbon-based monatomic catalyst through metal solid-phase diffusion as well as product and application of nitrogen-doped carbon-based monatomic catalyst
A nitrogen doping and catalyst technology, applied in electrolysis components, electrodes, electrolysis process, etc., can solve the problems of affecting metal morphology, difficult to form uniformly dispersed metal single-atom carbon-based materials, etc. Catalytic performance, high controllability effect
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Embodiment 1
[0047] Preparation method of nitrogen-doped carbon-based single-atom catalyst synthesized by metal solid-phase diffusion:
[0048] Step 1: Dissolve 5.58 g of solid 2-methylimidazole powder and 6.12 g of zinc nitrate hexahydrate in 150 ml of methanol respectively, ultrasonicate for 10 minutes, and stir for 10 minutes to dissolve completely. The two solutions were quickly mixed in a 500ml beaker.
[0049] Step 2: Put the beaker containing the mixed solution into an oven, and carry out a constant temperature reaction in the oven. The specific operation is to maintain the oven temperature at 35 °C for 12 h to obtain a white precipitate and a supernatant.
[0050] Step 3: Pour off the reacted supernatant, and wash the white precipitate obtained by the reaction with anhydrous methanol. The specific operation is as follows: the white precipitate is dissolved in anhydrous methanol, and the suspension is subjected to centrifugation, wherein the centrifugation speed is 10000 rpm, and ...
Embodiment 2
[0062] Compared with Example 1, the only difference is that different contents of methanol are used as solvent. As in the preparation method of Example 1, 150 ml of methanol in step 1 was replaced with 300 ml of methanol, and the rest of the steps remained unchanged to obtain a nitrogen-doped carbon-based single-atom catalyst with a nitrogen content of about 8.5 at.%. The XRD pattern of the nitrogen-doped carbon-based single-atom catalyst prepared in this example is as follows Figure 4 shown.
[0063] As in Application Example 1, the nitrogen-doped carbon-based single-atom catalyst synthesized by metal solid-phase diffusion prepared in Example 2 was used as the cathode material to obtain electrocatalytic CO 2 The highest Faradaic efficiency for reduction to CO is about 86.4%.
Embodiment 3
[0065] Compared with Example 1, the only difference is that different contents of methanol are used as solvent. As in the preparation method of Example 1, 150 ml of methanol in step 1 was replaced with 75 ml of methanol, and the rest of the steps remained unchanged to obtain a nitrogen-doped carbon-based single-atom catalyst with a nitrogen content of about 6.8 at.%. The XRD pattern of the nitrogen-doped carbon-based single-atom catalyst prepared in this example is as follows Figure 4 shown.
[0066] As in Application Example 1, the nitrogen-doped carbon-based single-atom catalyst synthesized by metal solid-phase diffusion prepared in Example 3 was used as the cathode material to obtain electrocatalytic CO 2 The highest Faradaic efficiency for reduction to CO is about 83.5%. Its electrochemical polarization curve in a three-electrode reaction cell and 0.5M potassium bicarbonate electrolyte is shown in Fig. Figure 5 shown.
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