MXenes compound catalyst as well as preparation method and application thereof
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A technology of catalysts and composites, applied in the field of MXenes composite catalysts and their preparation, can solve the problems of uneven surface distribution, ineffective adjustment, weak interaction, etc., and achieve easy large-scale industrial preparation, low cost, and synthetic process conditions mild effect
Active Publication Date: 2022-02-08
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0007] However, this technical solution has the following problems: first, the MXenes substrate Ti3C2 is easily oxidized And Co-CNT is unevenly distributed on the surface of Ti3C2; second, the catalyst Co-CNT / Ti3C2 The H2 / N2 mixed gas used in the high-temperature calcination during the preparation process makes a large number of Co particles exist; thirdly, the catalyst Co-CNT During the preparation of / Ti3C2, transition metals are not adsorbed on the surface of Ti3C2 so that Co and Ti The interaction of 3C2 is very weak and cannot effectively regulate Co-CNT / Ti3C2 for O The adsorption capacity of 2 and *OOH makes Co-CNT / Ti3C2 as an oxygen reduction catalyst, still with 4e - The reaction path is the main
[0008] According to the review, the prior art still lacks a highly active two-electron oxygen reduction reaction to produce H2O2 MXenes complex catalyst
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Embodiment 1
[0044] Example 1CONC / NB 2 CT x Preparation of materials
[0045] (1) Weigh 1G NB 2 ALC powder (Jilin Province, one-one technology Co., Ltd.) is placed in an HF solution of 20 ml of mass fraction of 40%, stirring the solution at room temperature, etching 48h, then washed, centrifuged 7 times, freeze drying 12h to obtain a layer Size NB 2 CT x MXENES substrate.
[0046] (2) Take 40mg NB 2 CT x Powder is added to 20 ml of anhydrous methanol in half an hour, according to 1 mmol of metal content, 0.182 g of CO (NO) 3 ) 2 Add to NB 2 CT x In the solution, stirring 24 h to obtain NB of adsorption CO 2 CT x Solution.
[0047] (3) Then, then the more than 20 ml of the dimethylimidazole solution of 0.4 mol / L / L was slowly added, and stirred for 4 h and then allowed to stand for 12h, centrifugally, and then dried in a vacuum drying tank at 60 ° C to obtain a precursor.
[0048] (4) Getting the dried precursor is calcined at 800 ° C under an argon atmosphere for 2 h to obtain a CONC / NB...
Embodiment 2
[0049] Example 2Conc / NB 2 CT x Preparation of materials
[0050] This example is substantially the same as in Example 1, and the difference is that NB 2 CT x Different, specifically take 20 mg powder NB in step (2) 2 CT x Add to 20 ml of anhydrous methanol.
Embodiment 3
[0051] Example 3CONC / NB 2 CT x Preparation of materials
[0052] This example is substantially the same as in Example 1, and the difference is that NB 2 CT x Different, specifically take 60 mg of powder NB in step (2) 2 CT x Add to 20 ml of anhydrous methanol.
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Abstract
The invention belongs to the technical field of catalysts, and particularly relates to an MXenes compound catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of: (1) adding MXenes powder and transition metal salt into a solvent, and mixing well to obtain an MXenes solution for adsorbing transition metal, M in the MXenes powder being one of Ti, Nb and Mo, and X being C or N; (2) adding an organic ligand solution into the MXenes solution for adsorbing transition metal, mixing well to obtain a turbid liquid, and separating and precipitating to obtain a precursor; and (3) calcining the precursor, and carrying out acid pickling to obtain the MXenes compound catalyst. By improving the preparation process of the MXenes compound, the adsorption capacity of the catalyst to O2 and *OOH is effectively adjusted, so that the transition metal and MXenes have strong interaction, the electrochemical hydrogen peroxide synthesis performance is excellent, the preparation process is simple, the cost is low, and the preparation method is suitable for industrial large-scale production.
Description
Technical field [0001] The present invention belongs to the technical field of catalyst, in particular to a composite MXenes catalyst and preparation method and application. Background technique [0002] Hydrogen peroxide H 2 O 2 It is one of the world's 100 most important chemicals, is recognized as environmentally friendly oxidant in chemical synthesis, food sterilization, pulp bleaching, sewage treatment and other industries are widely used. Hide 2 O 2 The conventional synthetic methods anthraquinone method, high energy consumption, pollution, and the production of H 2 O 2 A high concentration, there are security risks not easy to transport. Using an electrochemical method for producing H 2 O 2 With green pollution-free, field production, etc., received extensive attention from researchers. Wherein cathodic reduction of oxygen (ORR) is currently the most promising H 2 O 2 Electrochemical synthesis. [0003] From the ORR mechanism essentially fall into two categories: direct 4e...
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