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Preparation method of platinum/graphene catalyst for lithium air battery

A lithium-air battery and graphene technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem that stable lithium-air batteries are difficult to achieve commercial application Requirements and other issues to achieve the effect of improving and maintaining catalytic activity, not easy to migrate, and improving stability

Inactive Publication Date: 2013-04-03
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to catalyst activity, stability and cost issues, lithium-air batteries are currently difficult to meet the requirements of commercial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1. Sodium borohydride reduction method

[0011] Graphite oxide was ultrasonically dispersed in deionized water to form 2g of a 0.5wt% graphite oxide dispersion, and 1.35mg of chloroplatinic acid was added to mix evenly, so that the loading of platinum in the platinum / graphene catalyst was 5wt%. Adjust the pH value to 9 with 0.5M potassium hydroxide aqueous solution, add 0.16g sodium borohydride and 5g deionized water, reduce for 1 hour, then filter with suction, wash with deionized water, and dry at 100°C for 6 hours to obtain a lithium air Platinum / graphene catalysts for batteries. Catalyst electrochemical activity test results show that the maximum current density is 5.8mA / cm 2 , The open circuit voltage is -0.05V.

Embodiment 2

[0012] Embodiment 2. Sodium borohydride reduction method

[0013] Graphite oxide was ultrasonically dispersed in deionized water to form 5g of a 1wt% graphite oxide dispersion, and 14mg of chloroplatinic acid was added to mix evenly, so that the platinum loading in the platinum / graphene catalyst was 10wt%. Adjust the pH value of the mixed solution to 10 with 1M potassium hydroxide aqueous solution, add 0.47g sodium borohydride and 7g deionized water, reduce for 2 hours, then filter with suction, wash with deionized water, and dry at 60°C for 10 hours to obtain a lithium Platinum / graphene catalysts for air batteries. Catalyst electrochemical activity test results show that the maximum current density is 6.4mA / cm 2 , the open circuit voltage is -0.04V.

Embodiment 3

[0014] Embodiment 3. Sodium borohydride reduction method

[0015] Graphite oxide was ultrasonically dispersed in deionized water to form 10 g of a 0.06 wt% graphite oxide dispersion, and 3.23 mg of chloroplatinic acid was added to mix evenly, so that the platinum loading in the platinum / graphene catalyst was 20 wt%. Adjust the pH value to 10 with 2M potassium hydroxide aqueous solution, add 2g sodium hydroxide and 12g deionized water, reduce for 4 hours, then suction filter, wash with deionized water, and dry at 80°C for 12 hours to obtain a lithium-air battery. platinum / graphene catalyst. Catalyst electrochemical activity test results show that the maximum current density is 6.8mA / cm 2 , The open circuit voltage is -0.03V.

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Abstract

The invention discloses a preparation method of a platinum / graphene catalyst for a lithium air battery. For the catalyst, graphene is adopted as a carrier, sodium borohydride or ethylene glycol is adopted as a reducing agent, and graphite oxide and chloroplatinic acid are subjected to common reduction to obtain the platinum / graphene catalyst for the lithium air battery, wherein the platinum content in the catalyst is 5-50wt%. Active components of the prepared catalyst are dispersed uniformly on the graphene carrier, and the catalyst has excellent catalytic performance for related electrical catalytic reaction of the lithium air battery.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for a lithium-air battery, in particular to a method for preparing a platinum / graphene catalyst for a lithium-air battery. Background technique [0002] Lithium-air batteries have the advantages of high energy density, light system, non-toxic and pollution-free, and low price, and have great application prospects. However, due to catalyst activity, stability and cost issues, lithium-air batteries are currently difficult to meet the requirements of commercial applications. Using a suitable catalyst support or improving the support structure is beneficial to improve the performance of the catalyst. Various conductive carbon materials, such as carbon microspheres, multi-walled carbon nanotubes, and single-walled carbon nanotubes, have been used as electrocatalyst supports in order to improve their stability. [0003] Graphene is a carbon material with less than 10 layers of graphite molecular la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42
Inventor 李国儒银凤翔陈标华王亮
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH