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Preparation method of ruthenium doped LDH/rGO composite material and application of composite material in hydrogen evolution reactions

A composite material and hydrogen evolution reaction technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of large overpotential, poor conductivity, and the impact of hydrogen production catalyst catalysis Conversion rate and other issues to achieve the effect of improving hydrogen evolution performance, enhancing electrical conductivity, and accelerating water electrolysis ability

Inactive Publication Date: 2019-08-16
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

However, the agglomeration of hydrotalcite itself is serious and its conductivity is poor, which seriously affects the catalytic conversion rate of the hydrogen production catalyst and causes a large overpotential

Method used

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  • Preparation method of ruthenium doped LDH/rGO composite material and application of composite material in hydrogen evolution reactions
  • Preparation method of ruthenium doped LDH/rGO composite material and application of composite material in hydrogen evolution reactions

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Embodiment 1

[0020] 1. Add 3.0g graphite powder to concentrated H 2 SO 4 with concentrated H 3 PO 4 In the mixed solution with a volume ratio of 9:1, add 18.0g KMnO 4 Slowly added to the above mixed solution, warmed up to 50°C and stirred for 12h; added 400mL of ice to cool to room temperature, then added 3mL of 30% H 2 o 2 , filtered, the filtrate was centrifuged (4000rpm, 10 minutes), after removing the supernatant, washed with water (200mL), 30% HCl aqueous solution (200mL) and ethanol (200mL) successively, and finally the product was washed with deionized water until neutral , freeze-dried to obtain graphene oxide.

[0021] 2. Weigh 300mg of GO obtained in step 1 and disperse it in 20.0ml of 0.25M Co(NO 3 ) 2 Sonicate the clarified solution for 12 hours, add 1.5, 3, 5, 7, 9, 11 mL of RuCl with a concentration of 12.238 mg / mL 3 Aqueous solution, sonicated for 12h, then quickly added to 100ml of 0.125M ammonia solution continuously fed with pure oxygen, stirred at 40°C for 24 hou...

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Abstract

The invention discloses a preparation method of a ruthenium doped LDH / rGO composite material and an application of the composite material in hydrogen evolution reactions. Through the electrostatic interaction between hydrotalcite and graphene oxide, the ruthenium doped LDH / rGO composite material is prepared by a one-step reflux method. Hydrotalcite is loaded on graphene with a large surface area;the conductivity of graphene is enhanced; due to the anchoring effect of graphene, agglomeration of hydrotalcite is avoided; the active specific surface area is increased, and more active sites are exposed. The prepared composite material has a cobalt electrocatalytic active site and a ruthenium electrocatalytic active site, through the cooperation between two electrocatalytic active sites, the energy barrier of electrocatalytic reactions is reduced, the electrocatalytic over-potential is obviously reduced, due to the doping of Ru, the state of electrons on the surface of the composite material is changed, the oxygen defects are increased, the adsorption on intermediates by the reaction active sites is promoted, water electrolysis is accelerated, and the hydrogen evolution performance is enhanced.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrocatalytic materials, in particular to a preparation method of a ruthenium-doped LDH / rGO composite material and its application in hydrogen evolution reaction. Background technique [0002] Energy shortage and environmental pollution are real problems faced by human society to achieve sustainable development. Electrolyzed water technology can decompose water to produce hydrogen and convert electrical energy into hydrogen energy. The generated hydrogen can be used as fuel and energy carrier, which not only has high combustion calorific value and high energy density, but also has no pollution to the environment throughout the process. Therefore, electrocatalytic materials and technologies are currently recognized in the world as one of the most promising new technologies in the field of "simultaneously solving environmental and energy problems". Total hydrolysis consists of two half-r...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/10C25B11/06C25B1/04
CPCB01J23/8913B01J23/007C25B11/04C25B1/04B01J35/33B01J35/61Y02E60/36
Inventor 宋宇飞师蓉陈伟安赛
Owner BEIJING UNIV OF CHEM TECH
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