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ABO3 type double perovskite LaCoyNi1-yO3 nanorod electro-catalytic material and preparation method thereof

An electrocatalytic material, double perovskite technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of inability to realize large-scale application, low catalyst yield, poor selectivity, etc., achieve excellent performance and simple preparation process , Repeated tests with good results

Active Publication Date: 2021-06-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported catalysts are still limited by many problems such as low yield and poor selectivity, and cannot achieve large-scale application.

Method used

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  • ABO3 type double perovskite LaCoyNi1-yO3 nanorod electro-catalytic material and preparation method thereof
  • ABO3 type double perovskite LaCoyNi1-yO3 nanorod electro-catalytic material and preparation method thereof
  • ABO3 type double perovskite LaCoyNi1-yO3 nanorod electro-catalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Under stirring, 48.7mg of La(NO 3 ) 3 ·xH 2 O, 8.73mg of Co(NO 3 ) 2 ·6H 2 O and 22.17mg of Ni(HCO 2 ) 2 2H 2 O was dissolved in 27 mL of deionized water to obtain a clear and transparent solution. Subsequently, 3 mL of 1 mol / L KOH was added to obtain a cloudy dispersion, and the mixed solution was reacted at 180° C. for 10 h to form a suspension. Then, the above liquid was filtered, washed with water / ethanol, and dried at 70°C. Subsequently, the above-mentioned powders were calcined at a high temperature for 2 h at 250 °C in an argon atmosphere (wherein, the heating rate was 5 °C min -1 ), at 5°C min -1 The heating rate was increased to 650°C and kept for 5h. After several acid washes, LaCo 0.2 Ni 0.8 o 3 Nano stave. It is tested by experiments that LaCo 0.2 Ni 0.8 o 3 The nanorods have nitrogen electroreduction performance, within a certain overpotential range, the highest yield of ammonia and the highest Faradaic efficiency of 8.00 μg h -1 mg -1 ...

Embodiment 2

[0051] Under stirring, 48.7mg of La(NO 3 ) 3 ·xH 2 O, 14.55mg of Co(NO 3 ) 2 ·6H 2 O and 18.48mg of Ni(HCO 2 ) 2 2H 2 O was dissolved in 27 mL of deionized water to obtain a clear and transparent solution. Subsequently, 3 mL of 1 mol / L KOH was added to obtain a cloudy dispersion, and the mixed solution was reacted at 180° C. for 10 h to form a suspension. Then, the above liquid was filtered, washed with water / ethanol, and heated at 70 °C. Subsequently, the above-mentioned powders were calcined at a high temperature for 2 h at 250 °C in an argon atmosphere (wherein, the heating rate was 5 °C min -1 ), continue at 5°C min -1 The heating rate was increased to 650°C and kept for 5h. After several acid washes, LaCo 0.33 Ni 0.67 o 3 Nano stave. It is tested by experiments that LaCo 0.33 Ni 0.67 o 3 The nanorods have nitrogen electroreduction properties, and within a certain overpotential range, the highest yield of ammonia and the highest Faradaic efficiency are 8....

Embodiment 3

[0053] Under stirring, 48.7mg of La(NO 3 ) 3 ·xH 2 O, 21.83mg of Co(NO 3 ) 2 ·6H 2 O and 13.86mg of Ni(HCO 2 ) 2 2H 2 O was dissolved in 27 mL of deionized water to obtain a clear and transparent solution. Subsequently, 3 mL of 1 mol / L KOH was added to obtain a cloudy dispersion, and the mixed solution was reacted at 180° C. for 10 h to form a suspension. Then, the above liquid was filtered, washed with water / ethanol, and dried at 70°C. Subsequently, the above-mentioned powders were calcined at a high temperature for 2 h at 250 °C in an argon atmosphere (wherein, the heating rate was 5 °C min -1 ), continue at 5°C min -1 The heating rate was increased to 650°C and kept for 5h. After several acid washes, LaCo 0.5 Ni 0.5 o 3 Nano stave. It is tested by experiments that LaCo 0.5 Ni 0.5 o 3 The nanorods have nitrogen electroreduction properties, and within a certain overpotential range, the highest yield of ammonia and the highest Faradaic efficiency are 13.48 μg...

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Abstract

The invention discloses an ABO3 type double perovskite LaCoyNi1-yO3 nanorod electro-catalytic material and a preparation method thereof, and belongs to the technical field of electro-catalytic materials. The electro-catalytic material is prepared from cobalt nitrate hydrate, lanthanum nitrate hydrate, nickel formate hydrate and potassium hydroxide through the processes of coprecipitation, hydrothermal treatment, roasting, acid pickling and the like. The prepared LaCoyNi1-yO3 nanorod has a special nanostructure, so that more electrochemical active sites can be released, and more excellent electrocatalytic activity is shown. Meanwhile, optimization of the catalytic activity of the LaCoyNi1-yO3 nanorod is realized by regulating and controlling the ratio of the catalytic center metal on the B site. The ABO3 type double perovskite LaCoyNi1-yO3 nanorod is moderate in raw material price, simple to prepare and excellent in performance, has a good commercialization prospect, is an excellent electro-catalysis material, and can be used in the field of new energy conversion such as ammonia production through electro-catalysis nitrogen reduction.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, in particular to an ABO 3 type double perovskite LaCo y Ni 1-y o 3 Nanorod electrocatalytic material and preparation method thereof. Background technique [0002] Ammonia, as a chemical raw material with high added value, is widely used in the preparation of fibers and fertilizers. At the same time, as a carbon-free chemical intermediate, it has attracted extensive attention from researchers. At present, the method of industrial ammonia production is the Haber-Bosch method, which relies on high temperature (400-500° C.), high pressure (200-250 Bar) and the action of a catalyst. Therefore, the world consumes about 1% of the energy consumption every year to produce enough ammonia, and a large amount of greenhouse gases will be released through this method, which will bring great harm to the global environment. In order to solve the problems of high energy consumption and exc...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/27
CPCC25B1/00
Inventor 刘天西楚凯斌赖飞立
Owner JIANGNAN UNIV
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