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Double-functional perovskite/cerium oxide composite oxygen catalyst of bionic structure

A composite catalyst, oxygen catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst activation/preparation, etc., can solve the limitations of zinc-air battery discharge kinetic performance, perovskite Problems such as low catalytic activity of mineral oxygen

Active Publication Date: 2019-08-23
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to current reports, the oxygen catalytic activity of perovskites is still generally low. If the currently developed perovskites are used as oxygen catalysts, the discharge kinetics of zinc-air batteries will be greatly limited.

Method used

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  • Double-functional perovskite/cerium oxide composite oxygen catalyst of bionic structure
  • Double-functional perovskite/cerium oxide composite oxygen catalyst of bionic structure
  • Double-functional perovskite/cerium oxide composite oxygen catalyst of bionic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] With 0.271g cerium nitrate Ce(NO) 3 ·6H 2 O is Ce source, 1.498g barium hydroxide Ba(OH) 2 ·8H 2 O is barium source, 1.005g strontium nitrate Sr(NO 3 ) 2 As a strontium source, 2.328g cobalt nitrate Co(NO) 3 ·6H 2 O is cobalt source, 0.808g iron nitrate Fe(NO 3 ) 3 9H 2 O is an iron source, 20ml dimethylformamide (DMF) is an organic solvent, and polyvinylpyrrolidone (PVP) of 12%wt is added and fully mixed and stirred to obtain an electrospinning polymer solution, which is prepared by an electrospinning method (Ba 0.5 Sr 0.5 ) 1- x Ce x co 0.8 Fe 0.2 o 3 The nanofibers are dried and roasted at a certain temperature, wherein a voltage of 15KV is applied to the electrospinning needle, a receiver is placed at a distance of 15CM from the needle, the advancing speed of the syringe pump is 0.1ml / h, the working temperature is 50°C, and the humidity is 28%. The fibers obtained by electrospinning were dried at 60 °C for 12 h, and then sintered in a muffle furnace ...

Embodiment 2

[0029] With 0.271g cerium nitrate Ce(NO) 3 ·6H 2 O is Ce source, 1.498g barium hydroxide Ba(OH) 2 ·8H 2 O is barium source, 1.005g strontium nitrate Sr(NO 3 ) 2 As a strontium source, 2.328g cobalt nitrate Co(NO) 3 ·6H 2 O is cobalt source, 0.808g iron nitrate Fe(NO 3 ) 3 9H 2 O is an iron source, 20ml dimethylformamide (DMF) is an organic solvent, and 12%wt of polyacrylonitrile (PAN) is added to fully mix and stir to obtain an electrospinning outer layer polymer solution, and 9%wt of polyethylene Pyrrolidone (PVP) was added with 10ml of alcohol and stirred thoroughly, and prepared by electrospinning (Ba 0.5 Sr 0.5 ) 1-x Ce x co 0.8 Fe 0.2 o 3 The nanotubes are dried and roasted at a certain temperature. The electrospinning needle is applied with a voltage of 15KV, and the receiver is placed at a distance of 15CM from the needle. h The working temperature is 50°C and the humidity is 28%. The fibers obtained by electrospinning are dried at 60°C for 12 hours, and...

Embodiment 3

[0033] With 0.271g cerium nitrate Ce(NO) 3 ·6H 2 O is Ce source, 1.498g barium hydroxide Ba(OH) 2 ·8H 2 O is barium source, 1.005g strontium nitrate Sr(NO 3 ) 2 As a strontium source, 2.328g cobalt nitrate Co(NO) 3 ·6H 2 O is cobalt source, 0.808g iron nitrate Fe(NO 3 ) 3 9H 2 O is an iron source, 20ml dimethylformamide (DMF) is an organic solvent, and polyvinylpyrrolidone (PVP) of 12%wt is added and fully mixed and stirred to obtain an electrospinning polymer solution, which is prepared by an electrospinning method (Ba 0.5 Sr 0.5 ) 1- x Ce x co 0.8 Fe 0.2 o 3 The nanofibers are dried and roasted at a certain temperature, wherein the electrospinning needle is applied with a voltage of 18KV, a receiver is placed at a distance of 17CM from the needle, the advance speed of the syringe pump is 0.1ml / h, the working temperature is 50°C, and the humidity is 28%. The fibers obtained by electrospinning were dried at 60 °C for 12 h, and then sintered in a muffle furnace ...

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Abstract

The invention provides a double-functional perovskite / cerium oxide composite oxygen catalyst of a bionic structure and a preparation method, that is, CeO2 nanoparticles are grown on the surface of a perovskite nanofiber or nanotube in situ. According to physiological structure characteristics of fish gills, the perovskite nanofiber or nanotube is prepared by using an electrostatic spinning methodto simulate gill filaments in the fish gills. By using a desolvation or soaking method, nano cerium oxide granules are grown on the surface of the perovskite nanofiber or nanotube in situ to simulategill lamellae on the surfaces of the gill filaments. Due to the structure of the oxygen catalyst of the CeO2 nanoparticles grown on the surface of the perovskite nanofiber or nanotube in situ, the "concerted catalysis effect" of a catalyst body and a second phase can be sufficiently brought into play, the transmission velocity of oxygen ions and electrons can be increased, concentration polarization in the oxygen catalysis process can be degraded, and furthermore the activity of the oxygen catalyst can be improved.

Description

technical field [0001] The invention provides a bifunctional perovskite / cerium oxide composite nano-oxygen catalyst with a biomimetic structure, especially the in-situ composite CeO on the surface of perovskite nanofibers or nanotubes 2 Nanoparticle Oxygen Catalysts. Background technique [0002] Metal-air batteries have a series of advantages such as high efficiency, cleanliness, environmental protection, long life, high energy density, and low cost. They have shown broad application prospects and great commercial value in portable power sources and power sources. Metal-air batteries are mainly composed of metal anodes, alkaline electrolytes, air cathodes, and oxygen reduction / oxygen evolution bifunctional electrocatalysts, mainly including zinc-air batteries, aluminum-air batteries, and magnesium-air batteries. Compared with magnesium and aluminum-air batteries, one of the biggest advantages of zinc-air batteries is that they can be charged in traditional ways, and thus a...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/02B01J35/06B01J37/08B01J37/18B01J37/34
CPCB01J23/002B01J23/83B01J37/342B01J37/088B01J37/18B01J2523/00B01J35/58B01J35/40B01J2523/24B01J2523/25B01J2523/3712B01J2523/842B01J2523/845Y02E60/50
Inventor 武旭扬苗鹤袁金良陈斌
Owner NINGBO UNIV
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