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Co@N-C nanosheet with ultrathin hierarchical structure as well as preparation method and application thereof

A hierarchical structure and nanosheet technology, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems that hinder wide application, low selectivity, and scarce reserves, and achieve simple preparation methods, increase active sites, and increase surface area. Active area effect

Inactive Publication Date: 2021-07-02
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some urgent problems to be solved on the road of electrolysis of water to produce hydrogen. Among them, the oxygen evolution reaction requires high overpotential due to its complex mechanism, slow kinetics, and high-efficiency electrocatalysts to overcome obstacles.
[0003] RuO 2 and IrO 2 It is considered to be the most commonly used commercial catalyst, but its expensive reserves and low selectivity hinder its wide application. Therefore, the development of efficient and low-cost electrocatalysts is the core of electrolysis of water

Method used

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  • Co@N-C nanosheet with ultrathin hierarchical structure as well as preparation method and application thereof
  • Co@N-C nanosheet with ultrathin hierarchical structure as well as preparation method and application thereof
  • Co@N-C nanosheet with ultrathin hierarchical structure as well as preparation method and application thereof

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Embodiment 1

[0039] A method for preparing an ultrathin hierarchical structure Co@N-C nanosheet, comprising the following steps:

[0040] 1) Recrystallization of precursor and alkali metal inorganic salt saturated solution: measure 10mL saturated NaCl solution, add 5mL0.05mol L -1 Co(NO 3 ) 2 Precursor solution and 10mL 0.05mol L -1 The L-histidine solution was shaken and mixed evenly, dispersed in a watch glass and recrystallized at room temperature.

[0041] 2) Preparation of ultrathin hierarchical Co@N-C nanosheets: the recrystallized product obtained in step 1) was heated at 5°C min -1 The temperature was raised to 700° C. for heat treatment, and kept at this temperature for 2 hours. After cooling to room temperature, the final product was obtained by centrifuging and washing with water for several times.

Embodiment 2

[0043] A method for preparing an ultrathin hierarchical structure Co@N-C nanosheet, comprising the following steps:

[0044] 1) Recrystallization of precursor and alkali metal inorganic salt saturated solution: measure 10mL saturated Na 2 SO 4 solution, add 5mL0.05mol L -1 Co(NO 3 ) 2 Precursor solution and 10mL 0.05mol L -1 The L-histidine solution was shaken and mixed evenly, dispersed in a watch glass and recrystallized at room temperature.

[0045] 2) Preparation of ultrathin hierarchical Co@N-C nanosheets: the recrystallized product obtained in step 1) was heated at 5°C min -1 The temperature was raised to 700° C. for heat treatment, and kept at this temperature for 2 hours. After cooling to room temperature, the final product was obtained by centrifuging and washing with water for several times.

Embodiment 3

[0047] A method for preparing an ultrathin hierarchical structure Co@N-C nanosheet, comprising the following steps:

[0048] 1) Recrystallization of precursor and alkali metal inorganic salt saturated solution: measure 10mL saturated MgCl 2 solution, add 5mL0.05mol L -1 Co(NO 3 ) 2 Precursor solution and 10mL 0.05mol L -1 The L-histidine solution was shaken and mixed evenly, dispersed in a watch glass and recrystallized at room temperature.

[0049] 2) Preparation of ultrathin hierarchical Co@N-C nanosheets: the recrystallized product obtained in step 1) was heated at 5°C min -1 The temperature was raised to 700° C. for heat treatment, and kept at this temperature for 2 hours. After cooling to room temperature, the final product was obtained by centrifuging and washing with water for several times.

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Abstract

The invention discloses Co@N-C nanosheet with ultrathin hierarchical structure as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking alkali metal inorganic salt as a hard template, inorganic cobalt salt as a precursor and alkaline amino acid as a carbon source and a nitrogen source, uniformly mixing a saturated solution of the alkali metal inorganic salt, a cobalt precursor solution and the carbon source and the nitrogen source, and recrystallizing at room temperature, carrying out high-temperature reduction on the recrystallized product by utilizing a high-temperature reduction method to obtain the Co@N-C nanosheet with the ultrathin hierarchical structure. The ultra-thin hierarchical structure Co@N-C nanosheet has the advantages of large specific surface area, full load, high electrocatalytic activity and the like, and shows relatively high catalytic activity and stability as an oxygen evolution anode catalyst. The preparation method disclosed by the invention is simple, environment-friendly and universal.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an electrolytic water catalyst and its preparation method and application. Background technique [0002] At present, the development of new technologies and new energy sources is a research hotspot. A series of new energy sources such as solar energy, wind energy, and biomass energy have emerged as the times require. Among them, hydrogen energy, as a renewable energy source with abundant reserves, clean and pollution-free, is considered to be the most A promising new energy carrier. Among many hydrogen production methods, hydrogen production by electrolysis of water stands out because of its advantages of high efficiency, greenness, environmental protection, and abundant raw materials. The electric energy required for electrolysis can be supplied by solar energy, wind energy, etc.; therefore, hydrogen production by electrolysis of water is also an important energy source means of conver...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 唐亚文王悦李梦周其兴王琴张兴媛孙冬梅
Owner NANJING NORMAL UNIVERSITY
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