Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof

Abstract

The invention discloses a nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof. The carbon nanosheet has a flaky morphology, and is richin nitrogen doping amount, large in pore volume, high in mesoporous ratio, and highly graphitized as a whole. According to the preparation of the carbon nanosheet, a metal oxide nanosheet of manganese is taken as a template, a metal organic framework material is taken as a carbon source, a sandwich-type sandwich composite structure precursor material is formed by the template and the carbon source, the precursor material is pyrolyzed in an atmosphere without water or oxygen, the template is removed through acid treatment, the obtained product after the removal of the template is mixed with anitrogen source, and annealing is performed again to prepare the carbon nanosheet. A preparation method has the advantages that the raw materials are easy to obtain, the preparation is simple, the production cost is low, the macro preparation is easy to implement and the like, and provides a universal synthetic route for preparing a two-dimensional doped porous carbon material with high degree ofgraphitization from the metal organic framework material. At the same time, the invention also discloses the application of the nitrogen-doped porous graphite-like carbon nanosheet with a high specific surface and a rich mesoporous structure and as a metal-free catalyst to high-efficiency electrocatalytic oxygen reduction reactions.

Description

technical field [0001] The invention relates to the field of preparation of carbon nanomaterials. Specifically, it relates to a nitrogen-doped porous graphitic carbon nanosheet and its preparation and electrocatalytic application. Background technique [0002] Due to its advantages of high energy conversion efficiency and low pollution, fuel cells have excellent application prospects in energy conversion. However, the oxygen reduction reaction rate inside it is too slow, requiring precious metals such as platinum as catalysts, which makes the preparation of these batteries expensive. At the same time, noble metal particles are sensitive to methanol fuel and carbon monoxide products in the battery, and are easily deactivated after contact, thus limiting the large-scale production and application of fuel cells and metal-air batteries to a large extent. [0003] Carbon materials have good physical and chemical stability, electrical conductivity, and structural flexibility, an...

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Problems solved by technology

[0006] The conventional methods reported so far can only obtain micro-nano-sized amorphous carbon material particles derived from organic framework materials, but two-dimensional ultra-thin carbon nanosheet materials are constructed with metal-organic framework materials as precursors, especially conductive A good nearly completely graphitized carbon nanosheet material, which still maintains a large pore volume and specific surface area, to maximize its performance in electrocatalytic applications, is still a huge challenge in the field of carbon nanofunctional materials research.

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