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A bifunctional perovskite/ceria composite oxygen catalyst with biomimetic structure

A technology of composite oxygen catalyst and composite catalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc. Problems such as low oxygen catalytic activity of titanium ore

Active Publication Date: 2022-07-08
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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  • A bifunctional perovskite/ceria composite oxygen catalyst with biomimetic structure
  • A bifunctional perovskite/ceria composite oxygen catalyst with biomimetic structure
  • A bifunctional perovskite/ceria composite oxygen catalyst with biomimetic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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 the barium source, 1.005g strontium nitrate Sr (NO 3 ) 2 Strontium source, 2.328g cobalt nitrate Co(NO) 3 ·6H 2 O is the cobalt source, 0.808g ferric nitrate Fe (NO 3 ) 3 ·9H 2 O is the iron source, 20 ml of dimethylformamide (DMF) is the organic solvent, 12% wt of polyvinylpyrrolidone (PVP) is added and fully mixed to obtain an electrospinning polymer solution, which is prepared by electrospinning (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. The electrospinning needle is applied with a voltage of 15KV, and the receiver is placed at a distance of 15CM from the needle. The fibers obtained by electrospinning were dried at 60 °C for 12 h, and then sintered at 950 °C in a muffle furnace. The obtained nanofibers have a diameter of about 100 nm and a length of 20 μm.

[0025]The cerium-doped pero...

Embodiment 2

[0028] 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 the barium source, 1.005g strontium nitrate Sr (NO 3 ) 2 Strontium source, 2.328g cobalt nitrate Co(NO) 3 ·6H 2 O is the cobalt source, 0.808g ferric nitrate Fe (NO 3 ) 3 ·9H 2 O is the iron source, 20ml of dimethylformamide (DMF) is the organic solvent, 12%wt of polyacrylonitrile (PAN) is added and fully mixed to obtain a polymer solution for the outer layer of electrospinning. The 9%wt polyethylene Pyrrolidone (PVP) was added with 10 ml of alcohol and stirred well, and was 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 calcined 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. The speed of the outer syringe pump is 0.15ml / h, and the speed of the inner syringe pump is 0.1ml / h h The working temperatu...

Embodiment 3

[0032] 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 the barium source, 1.005g strontium nitrate Sr (NO 3 ) 2 Strontium source, 2.328g cobalt nitrate Co(NO) 3 ·6H 2 O is the cobalt source, 0.808g ferric nitrate Fe (NO 3 ) 3 ·9H 2 O is the iron source, 20 ml of dimethylformamide (DMF) is the organic solvent, and 12% wt of polyvinylpyrrolidone (PVP) is added to fully mix and stir to obtain an electrospinning polymer solution, which is prepared by electrospinning (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. The electrospinning needle is applied with a voltage of 18KV, and the receiver is placed at a distance of 17CM from the needle. The fibers obtained by electrospinning were dried at 60 °C for 12 h, and then sintered at 950 °C in a muffle furnace. The obtained nanofibers have a diameter of about 700 nm and a length of 30 μm.

[0033] 1.355g cer...

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Abstract

The invention provides a bifunctional perovskite / ceria re-oxygenation catalyst with a biomimetic structure and a preparation method, namely in-situ growth of CeO on the surface of perovskite nanofibers or nanotubes 2 nanoparticles. According to the physiological structure characteristics of fish gills, the invention adopts the electrospinning method to prepare perovskite nanofibers or nanotubes, so as to imitate the gill filaments in the fish gills. Nano-cerium oxide particles were grown in situ on the surface of perovskite nanofibers / tubes by desolvation or impregnation methods to mimic the gill lamellae on the surface of gill filaments. In-situ growth of CeO on the surface of perovskite nanofibers or nanotubes proposed in the present invention 2 The oxygen catalyst structure of nanoparticles is conducive to giving full play to the "synergistic catalytic effect" of the catalyst body and the second phase, increasing the transport rate of oxygen ions and electrons, reducing the concentration polarization in the oxygen catalysis process, and improving the activity of the oxygen catalyst.

Description

technical field [0001] The invention provides a bifunctional perovskite / ceria composite nano-oxygen catalyst with a biomimetic structure, especially in-situ composite CeO on the surface of perovskite nanofibers or nanotubes 2 Nanoparticle oxygen catalyst. 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 show 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, 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 a traditional way, which is not limited by many disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J35/02B01J35/06B01J37/08B01J37/18B01J37/34
CPCB01J23/002B01J23/83B01J35/023B01J35/06B01J37/342B01J37/088B01J37/18B01J2523/00B01J2523/24B01J2523/25B01J2523/3712B01J2523/842B01J2523/845Y02E60/50
Inventor 武旭扬苗鹤袁金良陈斌
Owner NINGBO UNIV
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