Bio-derived porous carbon prepared by micro-explosion and application of bio-derived porous carbon in supercapacitor

Abstract

The invention provides a method for preparing a bio-derived porous carbon material by micro-explosion. By using low-price, wide-source and renewable marine algae as a precursor, the porous carbon material prepared by adopting an explosion activation technical route shows an ultrahigh specific surface area of 2253m<2>g<-1>, low series resistance and sulfur and nitrogen doping. The pore diameter ofthe material is controlled to be 1-50 nm by regulating and controlling the morphology structure of the carbon material. The material is used as a supercapacitor electrode, and shows excellent electrochemical performance in the ionic liquid EMIMBF4. When the current density is 1 A g<-1>, the material has high specific capacitance of 228 F g<-1>, even under a high current density of 10 A g<-1>, thematerial still has specific capacitance of 173 F g<-1>, and under a power density of 20 kW kg<-1>, the energy density of the material can reach 41 Wh kg<-1>. In addition, after 10000 times of circulation, excellent reversibility is achieved, and the circulation efficiency is 80%. The method is simple in technical route steps, convenient to operate and high in practicability, and provides a new green and environment-friendly technical route for developing high-performance electrode materials.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices, and in particular relates to a micro-explosion activation method to regulate the morphology and structure of porous carbon nanomaterials derived from marine algae, and its application research in supercapacitors. Background technique [0002] With the rapid development of the global economy and the rapid consumption of fossil fuels, the energy crisis will be inevitable. There is an urgent need to seek clean and renewable energy and sustainable energy storage technologies are needed for efficient energy use. Among various energy conversion and storage devices, the rapid development of supercapacitors has attracted extensive attention from both industry and academia. Supercapacitors have more advantages than conventional capacitors, such as high power density, fast charging / discharging, long cycle life, and low maintenance cost, but the low energy density of supercapacitors li...

AI Technical Summary

Problems solved by technology

Currently common aqueous electrolytes (KOH, H 2 SO 4 etc.) severely limit the voltage window of the device, which in turn limits the energy density of supercapacitors

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