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Lanthanum ferrite photoelectrode, preparation method thereof, and application of lanthanum ferrite photoelectrode in lithium-oxygen battery

A technology of lanthanum ferrite and photoelectrode, which is applied in battery electrodes, fuel cell half-cells and secondary battery-type half-cells, circuits, etc., can solve the problems of increasing battery internal resistance, electrolyte decomposition, hindering catalyst and Active material contact and other problems, to achieve the effect of increasing the discharge potential and improving energy efficiency

Pending Publication Date: 2021-12-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But non-aqueous lithium-oxygen battery discharge product Li 2 o 2 It is a solid-phase insoluble insulating substance, which will accumulate on the surface and inside of the air electrode during charging and discharging, hindering the contact between the catalyst and the active material, resulting in an increase in the internal resistance of the battery
In addition Li 2 o 2 Excessive decomposition voltage will lead to the decomposition of the electrolyte, and the safety of the battery is difficult to guarantee

Method used

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  • Lanthanum ferrite photoelectrode, preparation method thereof, and application of lanthanum ferrite photoelectrode in lithium-oxygen battery
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  • Lanthanum ferrite photoelectrode, preparation method thereof, and application of lanthanum ferrite photoelectrode in lithium-oxygen battery

Examples

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Effect test

Embodiment 1

[0024] A preparation method of lanthanum ferrite photoelectrode, comprising the following steps:

[0025] 0.45 g La(NO 3 ) 3 , 0.18 g FeCl 2 and 2.0 g KNO 3 Dissolved in 50 mL distilled water to form a colorless transparent solution; using the solution as the electrolyte, Pt as the counter electrode, the pretreated conductive glass as the working electrode, and a saturated calomel electrode as the reference electrode, under the three-electrode system Conduct electrodeposition; the electrodeposition adopts the constant current method, set the current size to -10mA, and control the electrodeposition time to 60 s; after the electrodeposition is completed, the working electrode is taken out, and blue La(OH) is obtained on the surface of the conductive glass at this time. 3 and Fe(OH) 2 Total precipitation. Because Fe(OH) 2 It will be oxidized to FeOOH by oxygen in the air, which will turn the precursor film into light orange; then put it into a muffle furnace, heat-treat at ...

Embodiment 2

[0028] A preparation method of lanthanum ferrite photoelectrode, comprising the following steps:

[0029] 0.39 g La(NO 3 ) 3 , 0.16 g FeCl 2 and 1.5 g KNO 3 Dissolved in 50 mL distilled water to form a colorless transparent solution; using the solution as the electrolyte, Pt as the counter electrode, the pretreated conductive glass as the working electrode, and a saturated calomel electrode as the reference electrode, under the three-electrode system Electrodeposition was carried out; the constant current method was used for electrodeposition, the current size was set to -12.4 mA, and the electrodeposition time was controlled to be 80 s; after the electrodeposition was completed, the working electrode was taken out, and blue La(OH) was obtained on the surface of the conductive glass. ) 3 and Fe(OH) 2 Total precipitation. Because Fe(OH) 2 It will be oxidized to FeOOH by oxygen in the air, which will turn the precursor film into light orange; then put it into a muffle fur...

Embodiment 3

[0032] A preparation method of lanthanum ferrite photoelectrode, comprising the following steps:

[0033] 0.80 g La(NO 3 ) 3 , 0.35 g FeCl 2 and 2.4 g KNO 3 Dissolved in 80 mL of distilled water to form a colorless transparent solution; using this solution as the electrolyte, Pt as the counter electrode, pretreated conductive glass as the working electrode, and a saturated calomel electrode as the reference electrode, under the three-electrode system Electrodeposition was carried out; the constant current method was used for electrodeposition, the current size was set to -8.2mA, and the electrodeposition time was controlled to be 150 s; after the electrodeposition was completed, the working electrode was taken out, and blue La(OH ) 3 and Fe(OH) 2 Total precipitation. Because Fe(OH) 2 It will be oxidized to FeOOH by oxygen in the air, which will turn the precursor film into light orange; then put it into a muffle furnace, heat-treat at 600 °C for 6 h, wash with distilled...

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Abstract

The invention discloses a lanthanum ferrite photoelectrode, a preparation method thereof, and application of the lanthanum ferrite photoelectrode in a lithium-oxygen battery, and belongs to the field of photoelectrocatalysis and lithium-oxygen batteries. Lanthanum ferrite can grow on conductive glass in situ through electrodeposition and a one-step heat treatment method to form an electrode material capable of serving as a positive electrode of the lithium-oxygen battery; and the thickness can be controlled through the electrodeposition time. The electrode has the advantages of simple preparation process, controllable thickness, good repeatability and the like, and when the electrode is assembled in the lithium-oxygen battery, ultraviolet light and part of visible light can be absorbed, and light energy is converted into chemical energy to be stored in the battery. The photogenerated electrons generated by the photoelectrode under illumination can effectively promote the oxygen reduction process in the lithium-oxygen battery, the working potential of the battery is greatly improved, and the stable working state can be kept for a long time.

Description

technical field [0001] The invention belongs to the field of photoelectric catalysis and lithium-oxygen batteries, and in particular relates to a lanthanum ferrite photoelectrode, a preparation method thereof and an application in lithium-oxygen batteries. Background technique [0002] Electric energy is one of the fastest growing and most mature green and clean energy sources, but the storage and reuse of electric energy is difficult to compare with traditional fossil energy. Lithium-ion batteries are currently limited by the energy density of the cathode material, and its theoretical energy density is about 200-300 Whkg-1, which is difficult to achieve the same level as the energy density of traditional internal combustion engines. Because of its ultra-high theoretical energy density (3505 Whkg-1), lithium-oxygen batteries are considered to replace lithium-ion batteries and become the next generation of mainstream electrical energy storage devices, and have attracted exten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/08
CPCH01M4/8853H01M4/8882H01M4/9033H01M12/08H01M2004/8689
Inventor 王涛郁星宇夏雨娇曲宏娇徐芸芸高斌黄现礼何建平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS