Electrode material based on multi-walled carbon nanotube-carbonized wood mixed support, preparation method thereof and supercapacitor

Abstract

The invention discloses an electrode material based on a multi-walled carbon nanotube carbonized wood mixed support. The electrode material comprises a carbonized wood chip, wherein the carbonized wood chip is formed by carbonizing and activating a fir wood chip, a tubular cell structure is formed on the carbonized wood chip, and a multi-walled carbon nanotube grows on the inner wall of the tubular cell structure through chemical vapor deposition in-situ anchoring, so that an MWCNT-CW bracket is formed on the carbonized wood chip; and Co(OH)2 nanosheet coats the multi-walled carbon nanotube through electrochemical deposition to obtain the electrode material based on the multi-walled carbon nanotube-carbonized wood mixed support. A supercapacitor prepared from the electrode material has very high energy storage performance including 3.31 Fcm<-2> of surface capacitance, 0.9 mWhcm<-2> of energy density, 70 mWcm<-2> of power density and 97.8% of capacitance retention rate after 11,000 times of charging and discharging under the current density of 60 mAcm<-2>.

Description

technical field [0001] The invention relates to an electrode material for a supercapacitor, in particular to an electrode material based on a multi-walled carbon nanotube-carbonized wood hybrid support, a preparation method and a supercapacitor. Background technique [0002] Biomass-derived materials are of great interest to researchers in the construction of energy storage devices due to their abundance, versatility, inherent porosity, and low cost. There are a large number of tracheid structures in wood, the chamber size is tens of microns, which can be carbonized to impart electrical conductivity. The resulting carbonized wood scaffold inherits the original porous structure, which allows the internal loading of active species and enables the rapid transport of electrons along the tracheid channels. Therefore, carbonized wood is a suitable support for energy storage devices such as supercapacitors. Electrochemically active substances, such as cobalt hydroxide, manganese ...

AI Technical Summary

Problems solved by technology

Compared with synthetic electrodes, the innate porosity makes carbonized wood less susceptible to structural modification, so changing the local morphology and surface chemistry inside each tracheid structure remains intractable.

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