Ag-CuO-NrGO air electrode with supercapacitor performance and preparation method

An air electrode and supercapacitor technology, applied to battery electrodes, fuel cell half-cells, primary battery half-cells, electrical components, etc., can solve the problems of easy falling off of the catalyst layer and low efficiency of zinc-air batteries, and achieve Effect of improving charge-discharge cycle efficiency

Active Publication Date: 2018-11-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a Ag-CuO-NrGO air electrode with supercapacitive performance and a preparation method to solve the problems of low efficiency of zinc-air batteries and easy falling off of the catalyst layer

Method used

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  • Ag-CuO-NrGO air electrode with supercapacitor performance and preparation method
  • Ag-CuO-NrGO air electrode with supercapacitor performance and preparation method
  • Ag-CuO-NrGO air electrode with supercapacitor performance and preparation method

Examples

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Embodiment 1

[0034] This example is a CuO-NrGO catalyst layer supported by nickel foam, wherein the ratio of CuO and NrGO is 16:84. Mix 13 mL of graphene oxide and 27 mL of deionized water and stir for 1 hour, put in an oil bath and stir for 10 minutes, then add 5 mL of NH 3 ·H 2 O, stir and keep the temperature at 80°C for 24 hours. Centrifuge and wash multiple times with deionized water to remove remaining NH 3 ·H 2 O, the resulting product is nitrogen-doped reduced graphene oxide NrGO (the NrGO catalyst can be obtained by freeze-drying it). Afterwards, it was dispersed in deionized water and ultrasonicated for 30 minutes to obtain a uniformly dispersed suspension. 1.6 mL of 0.1M CuCl 2 The aqueous solution was added dropwise to the NrGO suspension and stirred for 10 minutes, then 6 mL of 0.1 M KOH was added dropwise and stirred for 1 hour. The suspension was centrifuged and washed with deionized water several times, followed by freeze-drying to obtain the CuO-NrGO catalyst. Put t...

Embodiment 2

[0036] This example is an air electrode prepared by foaming nickel to support an Ag-CuO-NrGO catalyst layer, wherein the ratio of Ag-CuO to NrGO is 9:91. Mix 13 mL of graphene oxide and 27 mL of deionized water and stir for 1 hour, put in an oil bath and stir for 10 minutes, then add 5 mL of NH 3 ·H 2 O, stir and keep the temperature at 80°C for 24 hours. Centrifuge and wash multiple times with deionized water to remove remaining NH 3 ·H 2 O, the resulting product is nitrogen-doped reduced graphene oxide NrGO (the NrGO catalyst can be obtained by freeze-drying it). Afterwards, it was dispersed in deionized water and ultrasonicated for 30 minutes to obtain a uniformly dispersed suspension. 1.6mL of 0.05M AgNO 3 -Cu(NO 3 ) 2 The aqueous solution was added dropwise to the NrGO suspension and stirred for 10 minutes, then 6 mL of 0.1 M KOH was added dropwise and stirred for 1 hour. The Ag-CuO-NrGO catalyst was obtained by centrifuging the suspension and washing it several t...

Embodiment 3

[0040] This example is an air electrode prepared by foaming nickel to support an Ag-CuO-NrGO catalyst layer, wherein the ratio of Ag-CuO to NrGO is 16:84. Mix 13 mL of graphene oxide and 27 mL of deionized water and stir for 1 hour, put in an oil bath and stir for 10 minutes, then add 5 mL of NH 3 ·H 2 O, stir and keep the temperature at 80°C for 24 hours. Centrifuge and wash multiple times with deionized water to remove remaining NH 3 ·H 2 O, the resulting product is nitrogen-doped reduced graphene oxide NrGO (the NrGO catalyst can be obtained by freeze-drying it). Afterwards, it was dispersed in deionized water and ultrasonicated for 30 minutes to obtain a uniformly dispersed suspension. 1.6mL of 0.1M AgNO 3 -Cu(NO 3 ) 2 The aqueous solution was added dropwise to the NrGO suspension and stirred for 10 minutes, then 6 mL of 0.1 M KOH was added dropwise and stirred for 1 hour. The Ag-CuO-NrGO catalyst was obtained by centrifuging the suspension and washing it several t...

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Abstract

The invention relates to an Ag-CuO-NrGO air electrode with supercapacitor performance and a preparation method. A novel silver/copper oxide-supported nitrogen-doped graphene catalyst layer free of a binder is prepared through directly growing nitrogen-doped reduced graphene oxide (NrGO), silver and copper oxide on a foamed nickel current collector. The catalyst layer has oxygen reduction catalyticactivity and the obtained air electrode has the supercapacitor performance, thereby comprehensively improving the charge-discharge cycle efficiency of a zinc-air battery through combining the supercapacitor performance with the oxygen reduction catalytic activity.

Description

technical field [0001] The invention belongs to the field of metal-air batteries and fuel batteries, and relates to an Ag-CuO-NrGO air electrode with supercapacitive performance and a preparation method. Background technique [0002] Zn-air batteries have become one of the most promising alternatives to lithium-ion batteries due to their high energy density, low cost, and environmental friendliness. However, zinc-air batteries have two problems in practical applications. One is the low conversion efficiency during charging and discharging. The general charging and discharging efficiency is 60%, which is lower than that of lithium-ion batteries (95%). The second is that the catalyst shedding during the air electrode cycle leads to the instability of the Zn-air battery. [0003] In order to solve the problem of low efficiency of zinc-air batteries, Glenn G. Amatucci et al. (Journal of The Electrochemical Society.2001, 148, A930-939) combined a high power density capacitor sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/06
CPCH01M4/8605H01M4/88H01M4/8807H01M4/8896H01M4/9016H01M4/9075H01M12/065
Inventor 陈福义邱传洲汤泉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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