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Electrocatalytic material related to compound carbon aerogel and preparation method thereof

A technology of electrocatalytic materials and carbon aerogels, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low theoretical capacity and energy density, difficult commercial application, and complicated preparation process and other problems, to achieve uniform pore size distribution, low raw material cost, simple and easy method

Inactive Publication Date: 2018-06-29
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional carbon airgel materials have low theoretical capacity, low energy density, and few active sites, which limit their applications in lithium batteries, supercapacitors, and electrocatalysis.
[0003] Graphene and carbon nanotubes that have appeared in recent years have excellent physical and chemical properties such as high specific surface area and good electrical conductivity, and play an important role in energy conversion and storage; however, the chemical properties of graphene and carbon nanotubes are stable, It is easy to stack and agglomerate, and requires some chemical or physical methods to effectively support the catalyst, which makes the preparation process complicated and difficult for commercial application

Method used

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  • Electrocatalytic material related to compound carbon aerogel and preparation method thereof
  • Electrocatalytic material related to compound carbon aerogel and preparation method thereof
  • Electrocatalytic material related to compound carbon aerogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] A preparation method of an electrocatalytic material related to a composite carbon aerogel, comprising the steps of:

[0035] Step 1: Mix the cellulose nanocrystal dispersion liquid with a mass percentage of 0.86% and ammonium molybdate, and stir it into a uniform viscous liquid; add deionized water to the viscous liquid and dilute it, and then pulverize it with an ultrasonic wave with a power of 1500W Ultrasonic treatment in the machine for 60 minutes to obtain a uniform dispersion of 0.01 wt %; the concentration of ammonium molybdate in the dispersion is 1mol / L;

[0036] Step 2: Put the dispersion obtained after dilution in Step 1 into a dialysis bag with a molecular weight of 10,000, place the dialysis bag in tert-butanol for 48 hours, and mechanically stir with a magnetic stirrer until the remaining volume of the suspension is the original volume At 1 / 3 of the time, collect the remaining suspension and put it into a bottle, freeze it in a -55°C ultra-low temperature...

Embodiment 2

[0039] A preparation method of an electrocatalytic material related to a composite carbon aerogel, comprising the steps of:

[0040] Step 1: Mix the dispersion of cellulose nanocrystals with phosphomolybdic acid at a mass percentage of 1.02% purchased on the market, and stir into a uniform viscous liquid; add deionized water to the viscous liquid and dilute it in a 1500W Ultrasonic treatment 60min in the ultrasonic pulverizer obtains a uniform dispersion of 0.5wt%; the concentration of phosphomolybdic acid in the dispersion is 10 -3 mol / L;

[0041] Step 2: Put the diluted dispersion obtained in Step 1 into a dialysis bag with a molecular weight of 11,000, place the dialysis bag in tert-butanol for 24 hours, and mechanically stir with a magnetic stirrer until the remaining volume of the suspension is the original volume At 1 / 3 of the time, collect the remaining suspension and put it into a bottle, freeze it in a -55°C ultra-low temperature refrigerator for 24 hours, and then t...

Embodiment 3

[0044] A preparation method of an electrocatalytic material related to a composite carbon aerogel, comprising the steps of:

[0045]Step 1: the mass percent that the market buys is that the dispersion liquid of 0.2% bacterial cellulose (BC) is mixed with ammonium molybdate, and is stirred into uniform viscous liquid; After adding deionized water to dilute in this viscous liquid Be ultrasonic treatment 60min in the ultrasonic pulverizer of 1500W, obtain the uniform dispersion liquid of 0.01wt%; The concentration of ammonium molybdate in the described dispersion liquid is 10 - 2 mol / L;

[0046] Step 2: Put the diluted dispersion obtained in Step 1 into a dialysis bag with a molecular weight of 8000, place the dialysis bag in tert-butanol for 24 hours, and mechanically stir with a magnetic stirrer until the remaining volume of the suspension is the original volume At 1 / 3 of the time, collect the remaining suspension and put it into a bottle, freeze it in a -55°C ultra-low tempe...

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Abstract

The invention discloses an electrocatalytic material related to compound carbon aerogel and a preparation method thereof. The electrocatalytic material is prepared through the steps of mixing a cellulose nano-crystal or a dispersion solution of a modified cellulose nano-crystal, and a compound containing transition metal, and then carrying out high-temperature carbonization under the protection ofammonia gas. The compound carbon aerogel is prepared by doping the transition metal through a wet-chemical method, so that the doping content of the transition metal is easy to control, the raw material cost is low and the method is simple and feasible. The compound carbon aerogel prepared by the invention has the advantages that the specific surface area is larger than that of common aerogel andthe pore diameter distribution is uniform; the compound carbon aerogel has good electrical conductivity and more chemical reaction active sites and is the excellent electrocatalytic material; the electrocatalytic material can be widely applied to the aspects including fuel cells, catalysis, adsorption and the like.

Description

technical field [0001] The invention relates to a composite carbon aerogel, in particular to an electrocatalytic material related to a composite carbon aerogel and a preparation method thereof. Background technique [0002] Energy crisis and environmental pollution have become two major problems faced by human beings, forcing human beings to pay more attention to the development of green and environmentally friendly new energy sources. In order to solve the problems of low energy utilization rate and disconnection in the process of new energy development and utilization, energy conversion and storage devices (such as fuel cells, lithium-ion batteries, supercapacitors, etc.) have become particularly important. Carbon aerogels, widely considered as one of the most promising high-performance materials, are lightweight porous carbon materials with tunable density and a porous network structure. Its porosity can be as high as 80-99%, and it has the characteristics of continuous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J37/08B01J37/34
CPCB01J27/22B01J37/084B01J37/343B01J35/33B01J35/23
Inventor 卢芸孔雪琳刘波殷亚方
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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