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A carbon-based bimetallic composite material, its preparation and application

A composite material and bimetallic technology, applied in the field of new carbon-based bimetallic composite double-shell hollow structure electrocatalysts, can solve the problems of complex catalyst preparation methods and difficult control of preparation process conditions, and achieve good application prospects and economic value. The effect of mild conditions and simple process

Active Publication Date: 2020-06-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the electrocatalysts prepared by the above method are not used in the anode oxygen evolution reaction of electrolyzed water, and the preparation method of some catalysts is relatively complicated, and the preparation process conditions are not easy to control, so the development cost is low, does not contain precious metals, and has high electrocatalytic activity and stability. Innovative multi-shelled hollow carbon spheres as OER electrocatalysts are of great significance for promoting the commercialization of water electrolysis for oxygen production

Method used

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  • A carbon-based bimetallic composite material, its preparation and application
  • A carbon-based bimetallic composite material, its preparation and application
  • A carbon-based bimetallic composite material, its preparation and application

Examples

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Effect test

Embodiment 1

[0070] Take 3 mol of cobalt salt (cobalt nitrate), 8 mol of dimethylimidazole, and 1 mol of iron salt (ferric chloride), and dissolve them in 40 mL of methanol respectively, and ultrasonicate for 10 min to form a uniform solution, and then add the methanol solution of cobalt salt at a rate of 5 mL / min. Add the methanol solution of dimethylimidazole at the acceleration rate, continue to sonicate for 10min, then add the methanol solution of iron salt to the above solution at a dropping rate of 5mL / min, continue to sonicate for 30min, then transfer to the autoclave and heat to 120 ℃ for 4 hours, cooled to room temperature, washed and centrifuged three times alternately with water and absolute ethanol, and vacuum-dried at 60℃ for 10 hours to obtain hollow Co 3 / Fe 1 Bimetallic MOF (SEM and TEM drawings see figure 1 c and e); take 10g hollow Co 3 / Fe 1 The bimetallic MOF was ground evenly with 10g of sublimated sulfur, heat-treated in an argon atmosphere at a heating rate of 5°C...

Embodiment 2

[0073] Compared with Example 1, the only difference is that the molar ratio of metal cobalt salt to iron salt is 4:1; other materials and parameters are unchanged. A composite material with a structure and morphology similar to Example 1 was obtained. The oxygen evolution performance results are as follows: at a current density of 10mA / cm 2 The oxygen evolution potential is 0.63V; the TOF is 11.3s at an overpotential of 320mV -1 .

Embodiment 3

[0075] Compared with Example 1, the only difference is that the molar ratio of metal cobalt salt to iron salt is 2:1; other materials and parameters are unchanged. A composite material with a structure and morphology similar to Example 1 was obtained. The oxygen evolution performance results are as follows: at a current density of 10mA / cm 2 The oxygen evolution potential is 0.67V; the TOF is 8.6s at an overpotential of 320mV -1 .

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Abstract

The invention discloses a carbon based bimetallic composite material. The composite material includes a carbon based shell, the inner surface of the carbon based shell is compounded with a sulfide ofa transition metal A, and the outer surface is compounded with an oxide of a transition metal B. The transition metal A and the transition metal B are selected from different metals. The invention also discloses a preparation method of the carbon based bimetallic composite material, and the method includes: subjecting a mixed solution salt containing a salt of the transition metal A, a salt of thetransition metal B, an organic ligand and alcohol to hydrothermal reaction at 60-180DEG C so as to obtain bimetallic MOF; and mixing the obtained bimetallic MOF with sublimed sulfur, then conductingroasting in a protective atmosphere at 300-800DEG C, thus obtaining the carbon based bimetallic composite material. In addition, the invention also includes application of the composite material as anOER electrocatalyst. The invention provides an electrocatalyst with a brand-new structure. The material has excellent OER catalytic performance. Under an electric current density of 10mA / cm<2>, the oxygen evolution potential is close to 0.55V, and under an overpotential of 320mV, the TOF can reach 34.7s<-1>.

Description

technical field [0001] The invention relates to a novel carbon-based bimetal composite double-shell hollow structure electrocatalyst, which belongs to the field of energy and catalytic materials. Background technique [0002] In recent years, the energy crisis and environmental pollution problems have become increasingly prominent, and the development of renewable energy and clean energy is imminent. Electrochemical water splitting has attracted extensive attention due to its environmental friendliness, high product purity, and no greenhouse gas emissions. Efficient water electrolysis catalysts require low overpotentials for both anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER), but the efficiency of electrocatalysts is limited by slow OER kinetics and high overpotentials, thus electrocatalysts that enhance OER Efficiency is the key to water splitting. It is generally considered that RuO 2 and IrO 2 Considered as the best OER electroc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/04Y02E60/36
Inventor 方静甘浪覃富荣王梦然赖延清李劼
Owner CENT SOUTH UNIV
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