Preparation of natural nutshell carbon material and application of natural nutshell carbon material in electrochemical capacitors

Abstract

The invention discloses a preparation of a natural nutshell carbon material and an application of the natural nutshell carbon material in electrochemical capacitors. The preparation of the natural nutshell carbon material refers to performing carbonization-alkali activation on a natural nutshell at high temperature to obtain a porous nano nutshell carbon material. In an alkali aqueous solution electrolyte, the specific capacitances of double electric layers respectively reach 312Fg<-1> and 224Fg<-1> under the potential scan rates of 2mV / s and 500mV / s. When organic electrolyte uses 1M tetraethylammonium tetrafluoroborate as an electrolyte, the capacitances respectively reach 209Fg<-1> and 50Fg<-1> under the potential scan rates of 10mVs(-1) and 500mVs(-1). Under a high scanning rate, the specific capacitance is relatively stable, which suggests that the natural nutshell carbon material has very broad application prospects as a high-power super capacitor active material. Moreover, as the material is natural biological material pistachio nut shell, the range of sources is wide, and the price is low. In addition, the electrode material preparation process is simple and controllable, the condition is mild, the equipment is simple, and the preparation process has practical production values.

Description

technical field [0001] The present invention relates to the preparation of a carbon material and its application in electrochemical capacitors, more particularly, it refers to a kind of carbon material using natural fruit shell as the precursor, after high temperature carbonization-alkali activation to obtain nanoporous The carbon material, which can be used to make electrodes of capacitors, belongs to the field of inorganic nanometer materials and electrochemistry. Background technique [0002] There are various kinds of husks in nature. Some have thick and hard walls, such as pistachios, walnut shells, almond shells, cherry shells, and jujube shells. There are also some shells with dense but thinner shells, such as sunflower seed shells, watermelon seed shells, peanut shells, pecan shells, etc. [0003] Supercapacitors are divided into double-layer capacitors and pseudocapacitors from the energy storage mechanism. It is a new type of energy storage device, which has the...

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Problems solved by technology

However, the activated carbon with high specific surface area is mostly mesoporous carbon, and the developed mesopores will inevitably sacrifice a certain micropore specific surface area; at the same time, the developed pore structure also restricts the stacking specific gravity of carbon materials and reduces the electrical conductivity of carbon materials. , so how to optimize the various structural parameters of carbon materials to obtain excellent electrochemical performance will become a hot spot in the research of carbon materials

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