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Fe-doped hydroxyl cobalt phosphite nanosheet array structure material as well as preparation method and application thereof

A technology for nanosheet arrays and structural materials, applied in the field of Fe-doped cobalt hydroxyphosphite nanosheet array structural materials and its preparation, can solve the problems of complex preparation methods and low catalytic activity, and achieve environmentally friendly and low-cost preparation processes , excellent catalytic activity and stability

Active Publication Date: 2019-11-22
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although cobalt hydroxyphosphite Co 11 (HPO 3 ) 8 (OH) 6 Has good application prospects, however, cobalt hydroxyphosphite Co in the prior art 11 (HPO 3 ) 8 (OH) 6 The preparation method is complicated, and the catalytic activity is low

Method used

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  • Fe-doped hydroxyl cobalt phosphite nanosheet array structure material as well as preparation method and application thereof
  • Fe-doped hydroxyl cobalt phosphite nanosheet array structure material as well as preparation method and application thereof
  • Fe-doped hydroxyl cobalt phosphite nanosheet array structure material as well as preparation method and application thereof

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Embodiment 1

[0048] An Fe-doped Co 11(HPO 3 ) 8 (OH) 6 A method for preparing a nanosheet array structure material, comprising the following steps:

[0049] Soak 2×3cm foam nickel in 6M hydrochloric acid solution, after 15 minutes, wash the foam nickel three times with deionized water and absolute ethanol, and dry to obtain surface-clean foam nickel. Accurately measure 10mL deionized water and 30mL isopropanol into a clean small beaker, then weigh 0.6mmol Fe(NO 3 ) 3 9H 2 O, 1mmol Co(NO 3 ) 2 ·6H 2 O and 1mmol NaH 2 PO 2 ·6H 2 O was added to a small beaker, stirred and dissolved for 30 minutes to obtain a uniform solution. Transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, insert the pre-treated nickel foam obliquely into the solution, seal and react in an oven at 160°C for 6 hours, and cool naturally to room temperature after the reaction is completed. The nickel foam covering the sample was washed three times with deionized water a...

Embodiment 2

[0059] Fe-doped Co 11 (HPO 3 ) 8 (OH) 6 A method for preparing a nanosheet array structure material, comprising the following steps:

[0060] Accurately measure 10mL deionized water and 30mL isopropanol into a clean small beaker, then weigh 0.4mmol or 0.8mmol Fe(NO 3 ) 3 9H 2 O, 1mmol Co(NO 3 ) 2 ·6H 2 O and 1mmol NaH 2 PO 2 ·6H 2 O was added to a small beaker and stirred evenly. Insert the dried nickel foam obliquely into a 50mL polytetrafluoroethylene-lined stainless steel reactor. After the solution is fully dissolved, transfer it to the reactor, seal it and react in an oven at 160°C for 6 hours. After the reaction is complete, cool down to room temperature naturally, wash the nickel foam covering the sample several times with deionized water and absolute ethanol, then place the nickel foam covering the sample to dry naturally in an air atmosphere, and the Fe(NO 3 ) 3 9H 2 When the addition amount of O was 0.4 mmol, the obtained Fe-doped Co 11 (HPO 3 ) 8 (...

Embodiment 3

[0065] An Fe-doped Co 11 (HPO 3 ) 8 (OH) 6 Applications of nanosheet structured materials as oxygen evolution reaction (OER) catalysts.

[0066] The specific application method is: doping Fe with an area of ​​0.5×0.5cm into Co 11 (HPO 3 ) 8 (OH) 6 The nanosheet structure material was used as the working electrode, platinum wire and Ag / AgCl electrode were used as the counter electrode and reference electrode respectively, and the CHI760E electrochemical workstation was used for testing in 1.0M KOH electrolyte solution. commercial RuO 2 and Co 11 (HPO 3 ) 8 (OH) 6 Nanosheets were loaded on nickel foam as working electrodes, and their OER performances were measured for comparison. Co 11 (HPO 3 ) 8 (OH) 6 The preparation is to omit the Fe(NO in the raw material on the basis of embodiment 1 3 ) 3 9H 2 O prepared. Using linear sweep voltammetry (LSV) at 2.0mV s -1 Polarization curves were obtained at a scan rate of 90% and an ohmic compensation of 90%.

[0067] ...

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Abstract

The invention discloses a Fe-doped hydroxyl cobalt phosphite nanosheet array structure material as well as a preparation method and application thereof. The preparation method comprises the followingsteps: dissolving ferric salt, cobalt salt and sodium hypophosphite into a mixed solvent of water and isopropanol; transferring the solution into a reaction kettle; obliquely putting foamed nickel into the solution for carrying out a solvothermal reaction, and cooling to room temperature after the reaction is finished; and washing and drying the product, so that the Fe-doped Co11(HPO3)8(OH)6 nanosheet array structure material can be prepared. According to the invention, a Fe-doped Co11(HPO3)8(OH)6 nanosheet array structure is designed and synthesized on a foamed nickel substrate; an electronicstructure of Co11(HPO3)8(OH)6 can be effectively adjusted by utilizing Fe doping, thereby reducing resistance, increasing active sites, improving hydrophilicity, and accelerating electron transfer rates; and the Fe-doped Co11(HPO3)8(OH)6 nanosheet array structure material is used as an electrocatalyst for oxygen evolution reaction, hydrogen evolution reaction and total hydrolysis reaction, has the advantages of high activity, good durability, simple preparation process and low cost, and has a very high value for researching the practical application of a water decomposition electrocatalytic electrode material.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation methods and electrocatalysis applications, and in particular relates to an Fe-doped hydroxy cobalt phosphite nanosheet array structure material and a preparation method and application thereof. Background technique [0002] Electrolysis of water to generate hydrogen and oxygen offers a promising approach for renewable energy storage. The key to this technology is to develop electrocatalysts with high activity, durability, and economical characteristics to realize the efficient progress of the two half-reactions of oxygen evolution (OER) and hydrogen evolution (HER). As we all know, IrO 2 and RuO 2 are considered as advanced OER catalysts, while Pt-based materials are advanced HER catalysts. However, the high cost and poor durability of these noble metal catalysts seriously hinder their large-scale application. Therefore, it is very necessary to search for electrocatalysts with low overp...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B11/06C25B1/04
CPCB01J27/1853C25B1/04C25B11/077B01J35/23B01J35/33Y02E60/36
Inventor 吴正翠许慧
Owner ANHUI NORMAL UNIV
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