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Controllable synthetic lanthanum-doped cobalt oxide nanosheet and preparation method and application thereof

A cobalt oxide and nanosheet technology, applied in the nano field, can solve the problems of limiting the commercial application of catalysts, high catalyst overpotential, slow kinetics, etc., and achieve the effects of high yield, low reaction temperature, and efficient catalysis

Active Publication Date: 2019-08-13
NANJING XIAOZHUANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although IrO 2 and RuO 2 It is also the electrocatalyst with the best catalytic OER properties at present, but the disadvantage is that IrO 2 and RuO 2 Expensive, which further limits the commercial application of the catalyst
[0004] According to literature research, OER requires multi-step electron transfer and transfer due to the strong O=O bond, resulting in slow kinetics and high overpotential of the catalyst.

Method used

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  • Controllable synthetic lanthanum-doped cobalt oxide nanosheet and preparation method and application thereof
  • Controllable synthetic lanthanum-doped cobalt oxide nanosheet and preparation method and application thereof
  • Controllable synthetic lanthanum-doped cobalt oxide nanosheet and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0036] At room temperature, weigh Co(NO 3 ) 2 ·6H 2 O 2.0mmol, La(NO 3 ) 3 ·6H 2 O 0.2mmol powder and 30ml distilled water were added to dry and clean beaker 1; suberic acid 6.0mmol, sodium hydroxide 15.0mmol powder and 30ml distilled water were added to dry and clean beaker 2. Sonicate and stir until completely dissolved to obtain solution A in beaker 1 and solution B in beaker 2.

[0037] The solution in beaker 1 was transferred to beaker 2, and mechanically stirred for 3 hours under a water bath at 50° C. to obtain a pre-reaction solution. Pipet 35ml of the pre-reaction solution with a pipette gun, put it into a polytetrafluoroethylene autoclave, put it into an oven, and directly raise the temperature to 195°C for 18 hours. After the reactor was naturally cooled to room temperature, it was washed three times with absolute ethanol and distilled water, and the solid was separated by centrifugation. The gray-brown product was obtained after washing the solid, which was ...

Embodiment 2

[0041] At room temperature, weigh Co(NO 3 ) 2 ·6H 2 O 2.0mmol, La(NO 3 ) 3 ·6H 2 O 0.1mmol powder and 30ml distilled water were added to dry and clean beaker 1; suberic acid 6.0mmol, sodium hydroxide 15.0mmol powder and 30ml distilled water were added to dry and clean beaker 2. Sonicate and stir until completely dissolved to obtain solution A in beaker 1 and solution B in beaker 2.

[0042] The solution in beaker 1 was transferred to beaker 2, and mechanically stirred for 3 hours under a water bath at 30° C. to obtain a pre-reaction solution. Pipet 35ml of the pre-reaction solution with a pipette gun, put it into a polytetrafluoroethylene high-pressure reactor, put it into an oven, and directly raise the temperature and keep it at 195°C for 18h. After the reactor was naturally cooled to room temperature, it was washed three times with absolute ethanol and distilled water, and the solid was separated by centrifugation. The gray-brown product was obtained after washing th...

Embodiment 3

[0044] In the three-electrode system, the electrochemical properties of the samples were tested by cyclic voltammetry and polarization curve method. The specific process is as follows:

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Abstract

The invention discloses a controllable synthetic lanthanum-doped cobalt oxide nanosheet and a preparation method and application thereof, and belongs to the field of nanometers. The lanthanum-doped cobalt oxide nanosheet is of an irregular monodisperse sheet structure, and the main elements of the lanthanum-doped cobalt oxide nanosheet are La, Co and O, wherein La, Co and O are uniformly distributed at the hexagonal edges. The lanthanum-doped cobalt oxide nanosheet has the excellent OER performance which is superior to the performance of IrO2 sold in the market at present. The nanosheet employs the hydrothermal solvent method, and is obtained through a drying oven program temperature control mode. The nanosheet is simple in process, is low in reaction temperature, is high in yield, is suitable for the batch production, and is of important guiding significance to the development of the renewable energy technology.

Description

technical field [0001] The invention relates to a controllable synthesis of lanthanum-doped cobalt oxide nanosheets and a preparation method and application thereof, belonging to the field of nanometers. Background technique [0002] As the global economy grows, everyone becomes more dependent on energy. So far, most of the energy we need comes from traditional fossil fuels (coal, oil, and natural gas, etc.), which are not sustainable and have limited reserves. The severe energy crisis and environmental pollution caused by fossil energy consumption are increasingly endangering the sustainable development of human society. It is imminent to develop cost-effective green energy storage technology and new energy. [0003] Fuel cells have the characteristics of high energy efficiency, no noise, no pollution, and continuous and stable operation. They are considered to be the most promising new energy technology in the 21st century. will normal H 2 -O 2 The fuel cell and the hy...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B82Y40/00
CPCB82Y40/00H01M4/8825H01M4/9016Y02E60/50
Inventor 杨慧刘苏莉顾祥耀景海燕赵君金峻宇
Owner NANJING XIAOZHUANG UNIV
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