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Method of preparing dual-function catalyst having oxygen reduction and oxygen separation activities by using biomass tar

A dual-function catalyst and biomass technology, applied in electrical components, battery electrodes, circuits, etc., to achieve good stability, strong catalytic activity, and excellent durability

Inactive Publication Date: 2019-02-01
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unlike coal tar, which can be used as an important chemical raw material, the tar produced by biomass pyrolysis belongs to the category of hazardous waste. So far, there is no other way of resource utilization except direct combustion

Method used

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  • Method of preparing dual-function catalyst having oxygen reduction and oxygen separation activities by using biomass tar
  • Method of preparing dual-function catalyst having oxygen reduction and oxygen separation activities by using biomass tar
  • Method of preparing dual-function catalyst having oxygen reduction and oxygen separation activities by using biomass tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Disperse 8g of biomass tar in 50ml of deionized water, add 24g of potassium hydroxide, ultrasonicate for 30min, and stir at room temperature for 10min to obtain mixed solution 1. Dissolve 24g of F127 in 100ml of deionized water and stir for 1h at room temperature to obtain solution 2. Solution 1 and Solution 2 were mixed, stirred at room temperature for 4 h, and dried at 100° C. for 24 h. The dried sample was pyrolyzed at 2°C / min at 900°C under a nitrogen atmosphere, and the reaction residence time was 3h. After the reaction, it was naturally cooled to room temperature to obtain a porous carbon material. The obtained porous carbon material was mixed with 150ml of 10wt% hydrochloric acid solution, acid-washed at room temperature for 24 hours, then the solution was filtered, washed with deionized water until neutral, and dried at 100°C for 24 hours. The dried sample was calcined at 900°C at 10°C / min under an ammonia atmosphere, and the residence time was 0.5h to obtain th...

Embodiment 2

[0030] Referring to Example 1, the difference is that the dried sample is calcined at 900° C. at 10° C. / min under an ammonia atmosphere, and the residence time is 1 h.

[0031] Catalyst activity test and stability test are the same as in Example 1, the measured starting voltage is -0.05V, and the limiting diffusion current density is -4.77mA / cm 2 .

Embodiment 3

[0033] Referring to Example 1, the difference is that the dried sample is calcined at 1000°C at 10°C / min under an ammonia atmosphere, and the residence time is 0.5h.

[0034] Catalyst activity test and stability test are the same as in Example 1, the measured starting voltage is -0.05V, and the limiting diffusion current density is -4.90mA / cm 2 .

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Abstract

The invention discloses a method of preparing a dual-function catalyst having oxygen reduction and oxygen separation activities by using biomass tar, wherein with the biomass tar being a carbon source, high-temperature carbonization is coupled with ammonia reduction by using KOH and a soft template, and specific surface area and degree of graphitization of the material are increased by means of high temperature alkaline activation and soft template pore forming. In addition, nitrogen is doped to improve the catalytic activity, selectivity and stability of the material. The catalyst is low in raw material cost and wide in raw material source, has great catalytic activity and is good in stability.

Description

Technical field: [0001] The invention relates to the technical field of nanometer functional materials, in particular to a method for preparing a bifunctional catalyst with oxygen reduction and oxygen precipitation activities from biomass tar. Background technique: [0002] The development of environmentally friendly new energy technologies is an important direction for future energy development in the world. Fuel cells, metal-air batteries, and electrolyzed water devices are considered to be the key to solving future energy problems. However, the oxygen electrode reactions involved, namely oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), both rely on highly active catalysts to overcome their own overpotential and slow kinetics, such as noble metal Pt and noble metal oxide RuO 2 , IrO 2 , but platinum-based catalysts usually appear easy to dissolve, methanol poisoning and other phenomena during the catalytic reaction; RuO 2 and IrO 2 It has high cataly...

Claims

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Application Information

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IPC IPC(8): H01M4/96
CPCH01M4/96Y02E60/50
Inventor 袁浩然李德念陈会兵
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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