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a kind of abo 3 type double perovskite laco y ni 1-y o 3 Nanorod electrocatalytic material and preparation method thereof

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

Active Publication Date: 2022-05-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
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  • 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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  • a kind of abo <sub>3</sub> type double perovskite laco <sub>y</sub> ni <sub>1-y</sub> o <sub>3</sub> Nanorod electrocatalytic material and preparation method thereof
  • a kind of abo <sub>3</sub> type double perovskite laco <sub>y</sub> ni <sub>1-y</sub> o <sub>3</sub> Nanorod electrocatalytic material and preparation method thereof
  • a kind of abo <sub>3</sub> type double perovskite laco <sub>y</sub> ni <sub>1-y</sub> o <sub>3</sub> Nanorod electrocatalytic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0049] Under stirring, 48.7 mg of La(NO 3 ) 3 ·xH 2 O, 8.73 mg of Co(NO 3 ) 2 ·6H 2 O and 22.17 mg of Ni(HCO 2 ) 2 ·2H 2 O was dissolved in 27 mL of deionized water to give a clear transparent solution. Subsequently, 3 mL of 1 mol / L KOH was added to obtain a cloudy dispersion, and the mixture 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 powder was calcined at a high temperature for 2 h under an argon atmosphere at 250 °C (wherein, the heating rate was 5 °C min -1 ), at 5℃min -1 The heating rate was increased to 650 °C and held for 5 h. After several acid washes, LaCo was obtained 0.2 Ni 0.8 O 3 Nano stave. After experimental detection, LaCo 0.2 Ni 0.8 O 3 The nanorods have nitrogen electroreduction performance, and the highest ammonia production and the highest Faradaic efficiency are 8.00 μg h within a certain overpotential range. -1 mg -1 ca...

Embodiment 2

[0051] Under stirring, 48.7 mg of La(NO 3 ) 3 ·xH 2 O, 14.55 mg of Co(NO 3 ) 2 ·6H 2 O and 18.48 mg of Ni(HCO 2 ) 2 ·2H 2 O was dissolved in 27 mL of deionized water to give a clear transparent solution. Subsequently, 3 mL of 1 mol / L KOH was added to obtain a cloudy dispersion, and the mixture was reacted at 180° C. for 10 h to form a suspension. Then, the above liquid was filtered, washed with water / ethanol, and kept at 70°C. Subsequently, the above powders were calcined at a high temperature under an argon atmosphere of 250 °C for 2 h (wherein, the heating rate was 5 °C min. -1 ), continue at 5℃min -1 The heating rate was increased to 650 °C and held for 5 h. After several acid washes, LaCo was obtained 0.33 Ni 0.67 O 3 Nano stave. After experimental detection, LaCo 0.33 Ni 0.67 O 3 The nanorods have nitrogen electroreduction performance, and the highest ammonia production and the highest Faradaic efficiency are 8.42 μg h within a certain overpotential rang...

Embodiment 3

[0053] Under stirring, 48.7 mg of La(NO 3 ) 3 ·xH 2 O, 21.83 mg of Co(NO 3 ) 2 ·6H 2 O and 13.86 mg of Ni (HCO 2 ) 2 ·2H 2 O was dissolved in 27 mL of deionized water to give a clear transparent solution. Subsequently, 3 mL of 1 mol / L KOH was added to obtain a cloudy dispersion, and the mixture 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 powder was calcined at a high temperature for 2 h under an argon atmosphere at 250 °C (wherein, the heating rate was 5 °C min -1 ), continue at 5℃min -1 The heating rate was increased to 650 °C and held for 5 h. After several acid washes, LaCo was obtained 0.5 Ni 0.5 O 3 Nano stave. After experimental detection, LaCo 0.5 Ni 0.5 O 3 The nanorods have nitrogen electroreduction performance, and the highest ammonia production and the highest Faradaic efficiency are 13.48 μg h within a certain overpotential range. -...

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Abstract

The invention discloses an ABO 3 type double perovskite LaCo y Ni 1‑y o 3 The nanorod electrocatalytic material and its preparation method belong to the technical field of electrocatalytic materials. The electrocatalytic material of the present invention is prepared by taking hydrated cobalt nitrate, hydrated lanthanum nitrate, hydrated nickel formate and potassium hydroxide as raw materials through coprecipitation, hydrothermal, roasting and pickling processes. The prepared LaCo y Ni 1‑y o 3 Due to their special nanostructure, nanorods can release more electrochemically active sites and exhibit better electrocatalytic activity. At the same time, by adjusting the metal ratio of the catalytic center on the B site, the LaCo y Ni 1‑y o 3 Optimization of nanorod catalytic activity. ABO of the present invention 3 type double perovskite LaCo y Ni 1‑y o 3 The raw material price of nanorods is moderate, the preparation is simple, the performance is excellent, and it has good commercialization prospects. It is an excellent electrocatalytic material and can be used in new energy conversion fields such as electrocatalytic nitrogen reduction to produce ammonia.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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