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One-step method for preparing graphene/nickel-iron hydrotalcite nanosheet bifunctional oxygen catalyst

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

Active Publication Date: 2021-05-11
青岛鸿硅高沃新材料科技有限公司
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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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  • One-step method for preparing graphene/nickel-iron hydrotalcite nanosheet bifunctional oxygen catalyst
  • One-step method for preparing graphene/nickel-iron hydrotalcite nanosheet bifunctional oxygen catalyst
  • One-step method for preparing graphene/nickel-iron hydrotalcite nanosheet bifunctional oxygen catalyst

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 graphene / nickel-iron hydrotalcite nanosheet bifunctional oxygen catalyst in one step and its electrocatalytic application to oxygen evolution reaction and oxygen reduction reaction in alkaline medium. The invention uses graphene oxide as the substrate, grows ultra-thin nickel-iron hydrotalcite nanosheets in situ in a mixed solution of formamide and water, and then prepares a graphene / nickel-iron hydrotalcite nanosheet composite oxygen catalyst by thermal reduction , this method avoids the steps of water-like stripping and chemical reduction of graphene oxide, increases the active sites of the catalyst, inhibits the aggregation of graphene and nickel-iron hydrotalcite nanosheets in the composite, and improves the composite Conductivity, the obtained catalyst reduces the overpotential of oxygen evolution and oxygen reduction reactions in alkaline media, reduces its electron transfer resistance, shows good oxygen catalytic performance and stability, and provides a basis for the development of potential bifunctional oxygen catalysts important method.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/02B01J37/03H01M4/90
CPCB01J23/755B01J35/0033B01J35/023B01J37/03H01M4/9016Y02E60/50
Inventor 詹天荣李智孙源康敬霞张晓
Owner 青岛鸿硅高沃新材料科技有限公司
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