Preparation method and use of modified carbon black-LaMnO3 covalent composite material

A composite material and modified carbon black technology, applied in chemical instruments and methods, physical/chemical process catalysts, structural parts, etc., can solve the problems of low activity, insufficient durability and high price, and achieve low process cost and convenient operation. , the effect of reducing the cost of raw materials

Active Publication Date: 2014-09-17
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

[0002] At present, the commercial Pt/C, Ag/C and other noble metal oxygen reduction electrocatalytic materials commonly used in various electrochemical energy stora

Method used

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  • Preparation method and use of modified carbon black-LaMnO3 covalent composite material
  • Preparation method and use of modified carbon black-LaMnO3 covalent composite material
  • Preparation method and use of modified carbon black-LaMnO3 covalent composite material

Examples

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Effect test

Embodiment 1

[0022] Preparation of modified carbon black-LaMnO with a composition ratio of 1:3 3 Covalent composites.

[0023] (1) Modified pretreatment of carbon carrier materials: using high-temperature graphitization + concentrated nitric acid + concentrated ammonia water for three consecutive steps of pretreatment; the first step is to put the carbon material (CB) into a self-made graphite tank and seal it, and then put the graphite The tank is sent to a large graphitization furnace at 2600°C under a protective gas argon atmosphere, kept for 1 hour and then cooled to room temperature with the furnace to obtain a highly graphitized carbon material (GCB); in the second step, weigh 10g of GCB and add it to a three-necked flask , Add 300ml of concentrated nitric acid and condense and reflux for 10h under the condition of 140°C oil bath. Cool the reaction solution, filter it, wash it with deionized water until it is neutral, and dry it in vacuum at 80°C; the third step is to add 300ml~500m...

Embodiment 2

[0028] Preparation of modified carbon black-LaMnO with a composition ratio of 2:3 3 covalent composite

[0029] (1) Modified pretreatment of carbon carrier materials: using high-temperature graphitization + concentrated nitric acid + concentrated ammonia water for three consecutive steps of pretreatment; the first step is to put the carbon material (CB) into a self-made graphite tank and seal it, and then put the graphite The tank is sent to a large graphitization furnace at 2600°C under a protective gas argon atmosphere, kept for 1 hour and then cooled to room temperature with the furnace to obtain a highly graphitized carbon material (GCB); in the second step, weigh 10g of GCB and add it to a three-necked flask , 300ml of concentrated nitric acid was condensed and refluxed for 10h in an oil bath at 140°C. Cool the reaction solution, filter it, wash it with deionized water until it is neutral, and dry it in vacuum at 80°C; the third step is to add 300ml~500ml of concentrated...

Embodiment 3

[0034] Preparation of modified carbon black-LaMnO with a composition ratio of 3:3 3 covalent composite

[0035] (1) Modified pretreatment of carbon carrier materials: using high-temperature graphitization + concentrated nitric acid + concentrated ammonia water for three consecutive steps of pretreatment; the first step is to put the carbon material (CB) into a self-made graphite tank and seal it, and then put the graphite The tank is sent to a large graphitization furnace at 2600°C under a protective gas argon atmosphere, kept for 1 hour, and then cooled to room temperature with the furnace to obtain a highly graphitized carbon material (GCB for short); the second step is to weigh 10g of GCB and add it to a three-necked flask In, add 300ml of concentrated nitric acid and condense and reflux for 10h under the condition of 140°C oil bath. Cool the reaction solution, filter it, wash it with deionized water until it is neutral, and dry it in vacuum at 80°C; the third step is to a...

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Abstract

The invention provides a preparation method of a modified carbon black-LaMnO3 covalent composite material. The modified carbon black-LaMnO3 covalent composite material has a C-O-M (La or Mn) covalent bond and has very high electrocatalytic activity and endurance to an oxygen reduction reaction in an alkaline medium. The preparation method comprises carrying out calcination blending on VulcanXC-72 carbon black subjected to high-temperature graphitization treatment, nitric acid acidification treatment and ammonia water treatment and perovskite oxide which is prepared from La(NO3).6H2O and MnCl2.4H2O as raw materials and tetramethylammonium hydroxide as a precipitator and has particle sizes of 20-100nm. Compared with a supported noble metal catalyst, the modified carbon black-LaMnO3 covalent composite material has the characteristics of low price and stable performances.

Description

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Claims

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Application Information

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Owner BEIJING UNIV OF CHEM TECH
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