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Carbon quantum dot catalyst applied to preparation of methane by electroreduction of carbon dioxide and preparation method of carbon quantum dot catalyst

A carbon quantum dot and carbon dioxide technology, applied in the field of carbon quantum dot catalyst and its preparation, to achieve the effects of high Faradaic efficiency, low cost, and high efficiency and selectivity

Pending Publication Date: 2021-11-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a new type of zero-dimensional semiconductor material, carbon quantum dots are widely used in electrocatalytic reduction of CO due to their wide range of sources, low price, high surface wettability, excellent stability, and more active center sites. 2 However, there are few reports on carbon quantum dot catalysts with high efficiency and selective production of methane

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  • Carbon quantum dot catalyst applied to preparation of methane by electroreduction of carbon dioxide and preparation method of carbon quantum dot catalyst
  • Carbon quantum dot catalyst applied to preparation of methane by electroreduction of carbon dioxide and preparation method of carbon quantum dot catalyst
  • Carbon quantum dot catalyst applied to preparation of methane by electroreduction of carbon dioxide and preparation method of carbon quantum dot catalyst

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Embodiment 1

[0029] In this embodiment, a method for preparing a carbon quantum dot catalyst applied to the electroreduction of carbon dioxide to prepare methane comprises the following steps:

[0030] (1) Select 10 mg of hippuric acid as a carbon source, add 10 mL of deionized water, and ultrasonically disperse and dissolve for 0.5 hours to obtain a dispersion; Ammonia solution, mix well, and react at 100°C for 10 hours;

[0031] (2) After the reaction in the step (1) ends, the initial product mixed solution is cooled to room temperature, and filtered with a 0.22 μm filter membrane to obtain a solution of carbon quantum dots; the initial product solution is dialyzed using a dialysis bag, Drying the dialyzed solution at 80°C to obtain carbon quantum dot powder;

[0032] (3) Weigh 2 mg of the carbon quantum dot powder obtained in the step (2), 6 μL of a mixture of Nafion solution, 500 μL of isopropanol and 500 μL of ultrapure water with a concentration of 5% by mass, and ultrasonically mix...

Embodiment 2

[0036] This embodiment is basically the same as Embodiment 1, especially in that:

[0037] In this embodiment, a method for preparing a carbon quantum dot catalyst applied to the electroreduction of carbon dioxide to prepare methane comprises the following steps:

[0038] (1) Select 50 mg of sodium urate as a carbon source, add it to 10 mL of ethanol, and ultrasonically disperse and dissolve for 0.5 hours to obtain a dispersion; then transfer the dispersion to a 25 mL polytetrafluoroethylene reactor, and add 1 mL of ethyl alcohol with a mass percentage concentration of 1.5%. Diamine solution, fully mixed and reacted at 160°C for 12 hours;

[0039] (2) After the reaction in the step (1) ends, the initial product mixed solution is cooled to room temperature, and filtered with a 0.22 μm filter membrane to obtain a solution of carbon quantum dots; the initial product solution is dialyzed using a dialysis bag, Drying the dialyzed solution at 80°C to obtain carbon quantum dot powde...

Embodiment 3

[0042] This embodiment is basically the same as the previous embodiment, and the special features are:

[0043] In this embodiment, a method for preparing a carbon quantum dot catalyst applied to the electroreduction of carbon dioxide to prepare methane comprises the following steps:

[0044] (1) Select 100mg of uric acid as a carbon source, add it to 46mL N,N-dimethylformamide solution, and ultrasonically disperse and dissolve for 0.5 hours to obtain a dispersion; then transfer the dispersion to a 100mL polytetrafluoroethylene reactor, add 4mL A hydrazine hydrate solution with a concentration of 8.2% by mass is mixed thoroughly and uniformly, and reacted at a temperature of 180° C. for 12 hours;

[0045] (2) After the reaction in the step (1) ends, the initial product mixed solution is cooled to room temperature, and filtered with a 0.22 μm filter membrane to obtain a solution of carbon quantum dots; the initial product solution is dialyzed using a dialysis bag, Drying the d...

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Abstract

The invention discloses a carbon quantum dot catalyst applied to preparation of methane by electroreduction of carbon dioxide and a preparation method of the carbon quantum dot catalyst, and belongs to the technical field of carbon quantum dot catalysts for preparation of methane by electroreduction of carbon dioxide. A uric acid compound is selected as a precursor and an alkaline solution, and carbon quantum dots are obtained through a top-down molecular fusion method. The synthesized carbon quantum dots have efficient selectivity and high Faraday efficiency for methane preparation. The used raw materials are low in price and easy to obtain, the preparation process is simple, the cost is low, carbon dioxide can be efficiently catalyzed and electrochemically reduced into methane, resource utilization of carbon dioxide can be effectively achieved, the carbon cycle industry chain is perfected, and good application prospects are achieved.

Description

technical field [0001] The invention relates to a carbon quantum dot catalyst used in carbon dioxide electroreduction to prepare methane and a preparation method thereof, and belongs to the technical field of carbon quantum dot catalysts for carbon dioxide electroreduction to prepare methane. Background technique [0002] With the rapid development of the global economy, a large amount of chemical energy such as petroleum, natural coal, and natural gas makes carbon dioxide (CO 2 ) The rapid increase in emissions has led to global warming and severe ecological and environmental problems for the ecosystem. Use electrocatalysis to convert carbon dioxide into other hydrocarbon fuels and other higher value-added chemicals under normal temperature and pressure conditions. Other hydrocarbon fuels converted include methane, carbon monoxide, formic acid, methanol, ethylene, ethanol etc. This method not only conforms to the national strategic goal of "carbon peak carbon neutrality",...

Claims

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Application Information

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IPC IPC(8): C25B11/083C25B3/03C25B3/26
CPCC25B11/083C25B3/03C25B3/26
Inventor 王亮郭华章
Owner SHANGHAI UNIV
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