Atomic-scale metal manganese-loaded nitrogen-doped mesoporous carbon nano-microsphere and application of atomic-scale metal manganese-loaded nitrogen-doped mesoporous carbon nano-microsphere

A nitrogen-doped mesoporous carbon and nano-microsphere technology is applied in nano-carbon, fuel cell-type half-cell and primary-cell-type half-cell, structural parts, etc. Effects of low central atom coordination number, high CO2 selectivity, and high electrocatalytic activity

Pending Publication Date: 2022-07-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the electrocatalytic performance of Mn-N-C is still limited, especially compared with Fe-N-C and Ni-N-C catalysts, the development of high CO 2 Mn-based electrocatalysts with RR activity and selectivity are an urgent problem to be solved
And so far, there is no metal manganese as Li-CO 2 A report on single-atom catalysts (SACs) in batteries

Method used

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  • Atomic-scale metal manganese-loaded nitrogen-doped mesoporous carbon nano-microsphere and application of atomic-scale metal manganese-loaded nitrogen-doped mesoporous carbon nano-microsphere
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  • Atomic-scale metal manganese-loaded nitrogen-doped mesoporous carbon nano-microsphere and application of atomic-scale metal manganese-loaded nitrogen-doped mesoporous carbon nano-microsphere

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) 6g Pluronic F127, 2g Pluronic P123 and 12g dopamine hydrochloride were added to a mixed solvent consisting of 400mL of water and 400mL of ethanol, and fully stirred to form a completely transparent monomer solution;

[0052] (2) Add 32 mL of 1,3,5-tritoluene (C 9 H 12 , TMB), stir for 1 h at 500 r / min, and then ultrasonicate for 15 min at 200 W ultrasonic power to form a milky white nano-microemulsion system; then add 30 mL of ammonia water with a mass fraction of 25%, and at 25 ° C at 800 r / The reaction was stirred at a stirring rate of min for 5 hours, and then the solid product was collected by centrifugation, washed with water and ethanol, and then freeze-dried at -75 °C for 24 hours to obtain a dopamine polymer;

[0053] (3) Dissolve 24 mg of manganese acetate in 100 mL of water to prepare a manganese salt aqueous solution; add 50 mg of dopamine polymer to the manganese salt aqueous solution, stir and react in an oil bath at 50 °C for 10 h, and then freeze-dr...

Embodiment 2

[0080] On the basis of Example 1, except that 1,3,5-trimethylbenzene (C 9 H 12 , TMB) was modified from 32mL to 16mL, and other steps and conditions were the same as in Example 1. Correspondingly, nitrogen-doped golf ball-shaped mesoporous carbon nanospheres supported by atomic manganese metal were obtained.

[0081] Figure 16 This is the FE-SEM image of the prepared golf ball-shaped mesoporous carbon nano-microspheres. It can be seen from the figure that the prepared mesoporous carbon nano-microspheres have a homogeneous golf ball structure with a diameter of about 150 nm. This is due to the swelling effect, as the TMB content in the ethanol / water solvent decreases, the pore size in the nanoemulsion gradually decreases, thereby forming a uniform porous structure with nanopores in the self-polymerization of dopamine; meanwhile, due to the TMB content Less, the role of TMB is only as a pore-enlarging agent, and cannot become the growth bed of nanocarbon, which leads to the d...

Embodiment 3

[0086] On the basis of Example 1, except that 1,3,5-trimethylbenzene (C 9 H 12 , TMB) was added from 32mL to 4mL, and other steps and conditions were the same as in Example 1. Correspondingly, nitrogen-doped spherical mesoporous carbon nanospheres supported by atomic manganese metal were obtained.

[0087] Figure 21 is the FE-SEM image of the prepared spherical mesoporous carbon nano-microspheres. It can be seen from the figure that the spherical carbon nanoparticles exhibit a smooth surface shape as the content of TMB in the monomer solution is further reduced. The particle diameter is ~200 nm.

[0088] Figure 22 For the TEM image of the prepared spherical mesoporous carbon nanospheres, it can be seen that there are a certain number of channels inside the particles. combine Figure 23 and Figure 24 The adsorption isotherm and pore size distribution curve of spherical mesoporous carbon nanospheres, the isotherm is at P / P 0 A sharp increase at 0 In the 2 / g, the corre...

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Abstract

The invention relates to an atomic-scale manganese metal loaded nitrogen-doped mesoporous carbon nano-microsphere and application thereof, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: preparing two kinds of polyethylene oxide-polypropylene oxide-polyethylene oxide with different molecular weights, dopamine hydrochloride and a mixed solvent of water and ethanol into a monomer solution; the preparation method comprises the following steps: firstly, preparing 1, 3, 5-trimethylbenzene and a monomer solution into a milky nano microemulsion system, and then adding ammonia water for stirring reaction to obtain a dopamine polymer; stirring the dopamine polymer and a manganese salt aqueous solution for reaction to obtain a polymer loaded with a metal precursor; and calcining the polymer loaded with the metal precursor in a nitrogen or inert gas protective atmosphere to obtain the mesoporous carbon nano-microspheres. The preparation method of the mesoporous carbon nano-microspheres is simple, conditions are mild, and the mesoporous carbon nano-microspheres can be used as a high-efficiency catalyst for preparing CO by reducing CO2 and a high-efficiency positive electrode catalyst of a Li-CO2 battery, and have a wide application prospect.

Description

technical field [0001] The invention relates to a nitrogen-doped mesoporous carbon nano-microsphere supported by atomic level metal manganese and its application, and belongs to the technical field of porous carbon material preparation. Background technique [0002] With the increasing consumption of fossil fuels worldwide, CO 2 emissions are becoming a serious threat to the environment. To meet the sustainable use of scarce fuels and chemicals, excess CO 2 Conversion into valuable chemicals or energy storage devices has attracted extensive research. Electrochemical CO 2 reduction reaction (CO 2 RR) can be converted into carbon-based feedstocks and fuels at room temperature using renewable power sources, which can suppress CO while producing valuable fuels and chemicals 2 emission. Among the electroreduction products, CO is a widely used product as a key component of syngas, which can be used to prepare a large number of basic chemical products and intermediates by usi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/23H01M4/88H01M4/90H01M12/06C01B32/15
CPCC25B11/091C25B1/23H01M4/8825H01M4/9041H01M4/9083H01M12/06C01B32/15H01M2004/8689Y02P20/133
Inventor 姚莹吴锋王美玲杨飞洋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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