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A technology of vanadium nitride nanometer and electrocatalyst, which is applied in physical/chemical process catalysts, chemical instruments and methods, nanotechnology, etc., can solve the problems that hydrogen production performance has not been paid attention to, and the development of bifunctional electrocatalyst is not ideal.
Inactive Publication Date: 2019-05-10
SHAANXI UNIV OF SCI & TECH
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In recent years, a lot of hydrogen evolution electrocatalysts or oxygen reduction electrocatalysts have been reported, such as carbides, nitrides, sulfides, phosphides, etc., but the development of bifunctional electrocatalysts that can be used for hydrogen production and oxygen reduction not ideal
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Embodiment 1
[0021] Step 1: Mix urea, ammonium metavanadate, and cobalt nitrate hexahydrate in a mass ratio of 20:3:4, and then grind them in a mortar to obtain reactant raw materials;
[0022] Step 2: Transfer the raw material of the reactant to a porcelain boat, raise the temperature to 900°C at a rate of 10°C / min in a tube furnace under an argonatmosphere, keep it warm for 2 hours, and wash the powder obtained after cooling with water and alcohol alternately Washed six times, then oven-dried at 60° C. for 6 h, and then ground in a mortar to obtain a cobalt-doped porous vanadium nitridenanosheet bifunctional electrocatalyst.
[0023] Depend on figure 1 It can be seen that the standard PDF card number corresponding to the sample prepared in this example is 35-0768, and the four diffraction peaks correspond to crystal planes (111), (200), (220) and (311) of VC respectively, and the diffraction peaks are sharp , and the intensity is high, indicating that the crystallinity of the sample o...
Embodiment 2
[0025] Step 1: Mix urea, ammonium metavanadate, and cobalt nitrate hexahydrate in a mass ratio of 22:3:4, and then grind them in a mortar to obtain reactant raw materials;
[0026] Step 2: Transfer the raw materials of the reactant to a porcelain boat, raise the temperature to 800°C at a rate of 10°C / min in a tube furnace under a nitrogenatmosphere, and keep it warm for 3 hours. After cooling, the obtained powder is alternately washed with water and alcohol. Six times, and then oven-dried at 60°C for 6h, and then ground by mortar to obtain a cobalt-doped porous vanadium nitridenanosheet bifunctional electrocatalyst.
Embodiment 3
[0028] Step 1: Mix urea, ammonium metavanadate, and cobalt nitrate hexahydrate in a mass ratio of 26:3:4, and grind them in a mortar to obtain reactant raw materials;
[0029] Step 2: Transfer the raw material of the reactant to a porcelain boat, raise the temperature to 750°C at a rate of 10°C / min in a tube furnace under a vacuum atmosphere, and keep it warm for 4 hours. After cooling, the powder obtained is washed with water and washed with alcohol alternately. Six times, and then oven-dried at 60°C for 6h, and then ground by mortar to obtain a cobalt-doped porous vanadium nitride nanosheet bifunctional electrocatalyst.
[0030] Depend on figure 2 It can be seen that VCoN is a porous nanosheet assembled by VN nanoparticles, and the particle size is about 10nm.
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Abstract
The invention discloses a preparation method of a cobalt doped porous vanadiumnitride nano-sheet dual-function electrocatalyst. The method includes the steps: mixing urea, ammonium metavanadate and cobalt-nitrate hexahydrate, and grinding mixture in a mortar to obtain a reactant material; transferring the reactant material into a porcelain boat, performing heating reaction in a tube furnace in aprotective atmosphere, cooling the heated reactant material to obtain powder, alternatively washing the powder by water and alcohol, placing the washed powder in a drying oven to dry the powder, and grinding the powder in the mortar to obtain the cobalt doped porous vanadiumnitride nano-sheet dual-function electrocatalyst. Activity of the electrocatalyst, surface property of the electrocatalyst,exposed number of active sites and conductivity are closely related, so that preparation method starts from three aspects, cobalt and nitrogen are doped, conductivity and wettability of the electrocatalyst can be improved, active sites are exposed by a porous mode, and the prepared electrocatalyst is uniform in shape and good in dispersibility and can be simultaneously used for electro-catalysishydrogen evolution and oxygen reduction reaction.
Description
technical field [0001] The invention relates to a synthesis method of a catalyst, in particular to a preparation method of a cobalt-doped porous vanadiumnitridenanosheetbifunctional electrocatalyst. Background technique [0002] With the increasing demand for energy, the development of energy conversion and storage technology is promoted. Therefore, the hydrogen evolution reaction and oxygen reduction reaction have attracted the attention of researchers because of their important roles in the conversion of electrical and chemical energy. To accelerate the reaction, it is necessary to design highly efficient bifunctional electrocatalysts for both hydrogen evolution and oxygen reduction reactions. [0003] Although platinum-based electrocatalysts are recognized as highly active electrocatalysts, it is of great research significance to develop non-precious metalbifunctional catalysts that can replace platinum-based electrocatalysts for environmental protection and cost con...
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