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Preparation method, product and application of a two-dimensional ultrathin stannous sulfide nanosheet
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A stannous sulfide and nanosheet technology, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of low efficiency, long time, difficult to peel off two-dimensional materials, etc., and achieve good reproducibility and low cost. , Product quality controllable effect
Active Publication Date: 2020-07-24
HANGZHOU NANOGEL NEW MATERIAL
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However, the traditional electrochemical stripping method needs to maintain a constant voltage, which has the disadvantages of long time consumption and low efficiency, making it difficult to quickly strip two-dimensional materials in large quantities.
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Embodiment 1
[0055] 1. Preparation of stannous sulfide bulk
[0056] (1) Mix sulfur powder and tin powder according to the stoichiometric ratio, and seal the mixture in a vacuum quartz glass tube after fully grinding;
[0057] (2) Use a tube furnace to heat the mixture from room temperature, the heating temperature is 500 ° C, the holding time is 24 hours, and the heating rate is 5 ° C min -1 After the heating is completed, the temperature is naturally lowered to obtain a stannous sulfide block.
[0058] 2. Electrolyte Preparation
[0059] Measure 50mL ultrapure water, weigh 7.1g Na 2 SO 4 , dissolve and stir with ultrapure water, and after cooling, dilute to volume in a 100mL volumetric flask to obtain 0.5M Na 2 SO 4 electrolyte.
[0060] 3. If figure 1 As shown, the electrochemical exfoliation of stannous sulfide blocks by alternating cathode and anode
[0061] (1) Connect the stannous sulfide block to the electrode with conductive copper tape as the working electrode, and the pl...
Embodiment 2
[0084] Compared with Example 1, the only difference is that the dispersion solvent used in the ultrasonic process is isopropanol, and other conditions are the same. The obtained two-dimensional ultrathin Sn2S nanosheets have a current density of 11.7mA cm at -1.0V -1 , the faradaic efficiency of formic acid is 61.4%.
Embodiment 3
[0086] Compared with Example 1, the only difference is that the dispersion solvent used in the ultrasonic process is N-methylpyrrolidone, and other conditions are the same. The resulting two-dimensional ultrathin SnS nanosheets have a current density of 8.2 mA cm at -1.0V -1 , the faradaic efficiency of formic acid is 53.0%.
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Abstract
The invention discloses a preparation method, product and application of a two-dimensional ultrathin stannous sulfide nanosheet. The preparation method includes: connecting the stannous sulfide block to the electrode with a conductive copper tape as a working electrode, the platinum sheet as a counter electrode, and Na 2 SO 4 The solution is used as the electrolyte, and the stannous sulfide block and the platinum sheet are immersed in the electrolyte; the negative voltage and the positive voltage are alternately applied to the working electrode repeatedly; the electrolyte containing the stannous sulfide flakes is vacuum filtered; the stannous sulfide flakes are washed and dried. Dispersed in a dispersing solvent, subjected to ultrasonic crushing, centrifuged, and freeze-dried to obtain two-dimensional ultrathin stannous sulfide nanosheets. The average thickness of the two-dimensional ultrathin stannous sulfide nanosheets is not more than 6nm, which has superior electrochemical performance and good formic acid selectivity when applied to the electroreduction of carbon dioxide. The technical scheme of the invention has the advantages of simplicity and high efficiency, low cost, controllable product quality, good reproducibility, and suitability for large-scale production.
Description
technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a preparation method, product and application of a two-dimensional ultrathin stannous sulfide nanosheet. Background technique [0002] Among the products of electrocatalytic reduction of carbon dioxide, formic acid has great application value as a fuel with high energy density. Therefore, the development of an efficient electrocatalytic reduction of carbon dioxide to formic acid is of great significance for energy conversion and environmental protection. Although the reported metal catalysts such as Pb, Hg, and Cd have high formic acid selectivity and catalytic activity, their high price and high toxicity limit their wide application. Although relatively safe and cheap tin-based catalysts show selectivity to formic acid in the electrocatalytic reduction of carbon dioxide, the structure of tin-based bulk materials makes them lack more exposed active sites and lar...
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