Nitrogen-doped porous carbon material based on polyvinylidene chloride and its preparation method and application

Abstract

The invention discloses a nitrogen-doped porous carbon material based on polyvinylidene chloride, using polyvinylidene chloride as a carbon source, and using a basic nitrogen-containing compound ethylenediamine or diethylenetriamine as a dehalogenating agent and nitrogen source. One-step method to achieve dechlorination and nitrogen doping, and finally activated by calcination. The preparation method of nitrogen-doped porous carbon materials based on polyvinylidene chloride includes the following steps: 1) one-step dechlorination and nitrogen doping; 2) calcination activation of carbon precursors. As the application of supercapacitor electrode material, when the current density is 0.5A g ‑1 , the specific capacitance value ranges from 401‑470 F g ‑1 . The invention has the following advantages: 1. realizing recycling of PVC and PVDC; 2. realizing dehalogenation of polyvinylidene chloride at normal temperature; and having broad application prospects in the field of porous carbon materials and supercapacitors.

Description

technical field [0001] The invention relates to the technical field of porous carbon materials, in particular to a nitrogen-doped porous carbon material based on polyvinylidene chloride and a preparation method and application thereof. Background technique [0002] As a common chlorine-containing polymer, polyvinylidene chloride (PVDC) can be seen everywhere in life, such as artificial turf, adhesives, food bags, medicine blister packaging, etc. However, these plastic products are difficult to degrade in the natural environment , Long-term accumulation will destroy soil, pollute groundwater, and endanger the survival of marine life. At the same time, the carcinogens dioxins and dioxins produced by incineration will also cause serious air pollution. Therefore, the recycling of polyvinylidene chloride (PVDC) waste plastic products is an urgent problem to be solved. [0003] Supercapacitors are fast energy storage devices, which are widely used in telecommunication systems, e...

AI Technical Summary

Problems solved by technology

There are following deficiencies in this technology: 1. Dechlorination is carried out at the same time as high-temperature pyrolysis PVDC, which will lead to two aspects of influence. On the one hand, dechlorination while pyrolysis will affect the stability of the porous carbon material structure; Elements will be emitted in the form of hydrogen chloride and other gases, causing serious environmental pollution problems; 2. The porous carbon material obtained by this method cannot be doped with nitrogen, which seriously affects its capacitor performance

This technology has the following disadvantages: 1. The preparation process of this material uses high concentration KOH to achieve dechlorination under strong alkaline conditions, which has corrosion problems for reaction instruments and discharge pressure of alkaline industrial waste liquid; 2. The required nitrogen source needs Additional addition increases the cost of raw materials; 3. The method of mixing nitrogen source melamine and PVDC is physical mixing, and there is uneven distribution of nitrogen element, and the binding force between nitrogen element and carbon element is weak, which affects the overall stability of the material; 4. The dechlorination and nitrogen doping operations are realized in two steps, the production process is complicated, the influencing factors increase, and the consistency of the final product is affected

At the same time, there is room for improvement in capacitance performance

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