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Method for preparing graphene/nickel-iron hydrotalcite nano-sheet bifunctional oxygen catalyst by one-step process

An oxygen catalyst, graphene technology, applied in the field of electrocatalysis, to achieve the effects of improved stability, low price, and easy mass production

Active Publication Date: 2018-12-18
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of rGO / LDHNS oxygen catalyst by this one-step method and the application of this catalyst in alkaline electrolysis water anode OER and fuel cell cathode ORR have not been reported.

Method used

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  • Method for preparing graphene/nickel-iron hydrotalcite nano-sheet bifunctional oxygen catalyst by one-step process
  • Method for preparing graphene/nickel-iron hydrotalcite nano-sheet bifunctional oxygen catalyst by one-step process
  • Method for preparing graphene/nickel-iron hydrotalcite nano-sheet bifunctional oxygen catalyst by one-step process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take a certain amount of graphene oxide GO and ultrasonically disperse it in 100mL aqueous solution containing 50% formamide to make the concentration 0.3mg / mL, add nickel nitrate hexahydrate and ferric nitrate nonahydrate to it at a molar ratio of 2:1, Make the total metal ion concentration 0.03mol / L, stir for 1h to completely dissolve the metal salt, and slowly titrate with 0.7mol / L sodium hydroxide aqueous solution containing 50% formamide until the pH of the reaction solution is about 8.5 under the condition of vigorous stirring ~9.5, move the mixed solution into a reaction kettle and react at 140°C for 8 hours. After cooling, the reaction solution is centrifuged at 4000rpm, washed with deionized water and ethanol for 3 times, and dried to obtain graphene / nickel-iron hydrotalcite nanoparticles. Sheet complex, denoted as rGO / LDHNS.

Embodiment 2

[0027] Take a certain amount of graphene oxide GO and ultrasonically disperse it in 100mL aqueous solution containing 40% formamide to make the concentration 0.1mg / mL, add nickel nitrate hexahydrate and ferric nitrate nonahydrate to it at a molar ratio of 2:1, Make the total metal ion concentration 0.03mol / L, stir for 1h to completely dissolve the metal salt, and slowly titrate with 0.7mol / L sodium hydroxide aqueous solution containing 40% formamide until the pH of the reaction solution is about 8.5 under the condition of vigorous stirring ~9.5, move the mixed solution into the reaction kettle and react at 120°C for 10h. After cooling, the reaction solution is centrifuged at 4000rpm, washed with deionized water and ethanol for 3 times, and dried to obtain graphene / nickel-iron hydrotalcite nanometer Sheet complex, denoted as rGO / LDHNS.

Embodiment 3

[0029]Take a certain amount of graphene oxide GO and ultrasonically disperse it in 100mL aqueous solution containing 60% formamide to make the concentration 0.5mg / mL, add nickel nitrate hexahydrate and ferric nitrate nonahydrate to it at a molar ratio of 2:1, Make the total metal ion concentration 0.03mol / L, stir for 1h to completely dissolve the metal salt, and slowly titrate with 0.7mol / L sodium hydroxide aqueous solution containing 60% formamide until the pH of the reaction solution is about 8.5 under the condition of vigorous stirring ~9.5, move the mixed solution into a reaction kettle and react at 150°C for 8 hours, after cooling, the reaction solution is centrifuged at 4000rpm, washed with deionized water and ethanol for 3 times, and dried to obtain graphene / nickel-iron hydrotalcite nanometer Sheet complex, denoted as rGO / LDHNS.

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Abstract

The invention relates to a method for preparing a graphene / nickel-iron hydrotalcite nano-sheet bifunctional oxygen catalyst by a one-step process, and an electrocatalytic application thereof in an oxygen evolution reaction and an oxygen reduction reaction in an alkaline medium. Graphene oxide is as a substrate, ultrathin nickel-iron hydrotalcite nano-sheets in situ grow in a formamide and water mixed solution, and thermal reduction is carried out to prepare the graphene / nickel-iron hydrotalcite nano-sheet composite oxygen catalyst. The method avoids the steps of hydrotalcite-like peeling and chemical reduction of graphene oxide, increases the active sites of the catalyst, inhibits aggregation of graphene and nickel-iron hydrotalcite nano-sheets in the compound, and improves the conductivity of the compound; and the obtained catalyst reduces the overpotential of oxygen evolution and oxygen reduction reactions in the alkaline medium, reduces the electron transfer resistance, has good oxygen catalytic performance and stability, and provides a great way for the development of potential bifunctional oxygen catalysts.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrocatalysis technology, and specifically relates to a method for preparing graphene / nickel-iron hydrotalcite nanosheet bifunctional oxygen catalyst by one-step method, and also includes the oxygen evolution reaction of the catalyst in the anode of alkaline electrolyzed water and fuel cell Electrocatalytic Applications in Cathodic Oxygen Reduction Reaction Background technique: [0002] As environmental issues such as global warming caused by fossil fuels have become prominent, researchers have devoted a lot of energy to the development of new energy sources, as well as efficient storage and conversion. However, the process of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) involved in the storage and conversion of new energy is slow, which hinders fuel cells, metal-air batteries (ORR), water splitting energy storage systems (OER), One of the main problem...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/02B01J37/03H01M4/90
CPCH01M4/9016B01J23/755B01J37/03B01J35/40B01J35/33Y02E60/50
Inventor 詹天荣李智孙源康敬霞张晓
Owner QINGDAO UNIV OF SCI & TECH
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