Method for preparing biomass carbon-based composite energy storage material by utilizing plant fiber

A technology of composite energy storage materials and biomass carbon, which is applied in the field of comprehensive utilization of natural plant fibers and can solve problems such as difficulties in large-scale promotion

Inactive Publication Date: 2013-10-02
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of existing technologies to prepare biomass activated carbon energy storage materials for supercapacitors still has certain limitations, and it is difficult to promote them on a large scale.

Method used

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  • Method for preparing biomass carbon-based composite energy storage material by utilizing plant fiber
  • Method for preparing biomass carbon-based composite energy storage material by utilizing plant fiber
  • Method for preparing biomass carbon-based composite energy storage material by utilizing plant fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: the preparation of nano nickel hydroxide

[0022] Measure 80 ml of 0.6 mol / L nickel chloride aqueous solution, and add concentrated ammonia water drop by drop under stirring until the pH of the solution is 9. After stirring for 30 minutes, the mixture was transferred to an autoclave for hydrothermal reaction at 200° C. for 48 hours. Naturally cool to room temperature, centrifuge, and obtain nano-sheet nickel hydroxide after washing and drying (see image 3 ). X-ray powder diffraction spectrum ( figure 1 ) is consistent with the standard spectrum of β-nickel hydroxide (JCPDS No.14-01117); the diffraction peak is narrow and has good crystallinity, and the average particle size calculated by the Scherrer formula is about 34.3nm; no impurity diffraction peak , high purity.

Embodiment 2

[0023] Embodiment 2: one-step hydrothermal synthesis of nickel hydroxide / biomass carbon (23%) composite material

[0024] Take 1.0 g of peanut shells, wash them, dry them, crush them mechanically, and then ultrasonically crush them in 150 ml of distilled water. The suspension was magnetically stirred and heated to 50° C., 80 ml of 0.5 mol / L nickel chloride aqueous solution was added dropwise, and the stirring was continued for 30 minutes. The reaction mixture was cooled to room temperature, and concentrated aqueous ammonia was added dropwise until the pH of the solution was 9. After stirring for 30 minutes, the mixture was transferred to an autoclave for hydrothermal reaction at 200° C. for 48 hours. Cool naturally to room temperature, centrifuge, wash and dry to obtain a nickel hydroxide / biomass carbon composite material, and the thermogravimetric analysis shows that the carbon content is 23%. X-ray powder diffraction spectrum (see figure 1 ) is consistent with the standar...

Embodiment 3

[0025] Embodiment 3: Two-step hydrothermal synthesis of nickel hydroxide / biomass carbon (28%) composite material

[0026] Take 1.0 g of peanut shells, wash them, dry them, crush them mechanically, and then ultrasonically crush them in 150 ml of distilled water. The above suspension was subjected to a hydrothermal reaction at 200° C. for 48 h in an autoclave. Cool naturally, centrifuge, and ultrasonically disperse in distilled water after washing to obtain a biomass carbon suspension. According to the mass ratio of 7:3 (nickel hydroxide / biomass carbon), 0.5 mol / L nickel chloride aqueous solution was added dropwise, and the stirring was continued for 30 minutes. The reaction mixture was cooled to room temperature, and concentrated aqueous ammonia was added dropwise until the pH of the solution was 9. After stirring for 30 minutes, the mixture was transferred to an autoclave for hydrothermal reaction at 200° C. for 48 hours. Naturally cool to room temperature, centrifuge, wash...

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Abstract

The invention discloses a method for preparing a biomass carbon-based composite energy storage material by utilizing plant fiber. Natural plant fiber such as straws, sawdust and cotton is subjected to mechanical pulverization and ultrasonication, and then conducts hydrothermal reaction with metal salt at 150-350 DEG C for 10-72 hours under an alkaline condition to synthesize in one step; or the plant fiber is subjected to hydrothermal carbonization in advance; then biomass carbon reacts with the corresponding metal salt, including the hydrothermal reaction; and the biomass carbon-based metal oxide and hydroxide composite material is synthesized in two steps. The electrochemical energy storage performance of the biomass carbon-based composite material prepared by the method is significantly improved compared with corresponding pure metal oxide and hydroxide.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of natural plant fibers, in particular to a biomass carbon-based composite energy storage material and a preparation method thereof. Background technique [0002] In recent years, government departments at all levels have stepped up efforts to guide and manage the comprehensive utilization of crop waste such as straw and chaff. "Implementation Plan for Comprehensive Utilization of Crop Straw", hoping to effectively solve the problems of environmental pollution and resource waste caused by straw burning. Although remarkable results have been achieved at present, the situation is still grim. The existing technology is not enough to consume a large amount of by-products such as straws produced by agricultural activities every year, resulting in a considerable part of plant fibers such as straws and chaff being discarded or incinerated. It is necessary to carry out research on the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B13/14C01B32/05
Inventor 解勤兴商莹莹解超
Owner TIANJIN POLYTECHNIC UNIV
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