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Cu-doped cobalt hydroxide nanosheet array structure material and preparation method and application thereof

A nanosheet array and structural material technology, applied in the field of Cu-doped cobalt hydroxide nanosheet array structure material and its preparation, can solve the problem that the catalytic activity needs to be further improved, so as to accelerate the interface charge transfer rate and increase the electrochemical performance. Active area, the effect of accelerating charge transfer rate

Active Publication Date: 2020-11-03
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cobalt-based materials are rarely used in UOR and total urea electrolysis processes, and their catalytic activity needs to be further improved.

Method used

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  • Cu-doped cobalt hydroxide nanosheet array structure material and preparation method and application thereof
  • Cu-doped cobalt hydroxide nanosheet array structure material and preparation method and application thereof
  • Cu-doped cobalt hydroxide nanosheet array structure material and preparation method and application thereof

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Embodiment 1

[0047] A Cu-doped Co(OH) 2 A method for preparing a nanosheet array structure material, comprising the following steps:

[0048] Soak 2×3cm foam nickel in 6M hydrochloric acid solution for 15 minutes, wash the foam nickel three times with deionized water and absolute ethanol, and dry naturally to obtain foam nickel with a clean surface. Accurately measure 20mL deionized water and 15mL methanol into a clean beaker, then weigh 0.2mmol Cu(NO 3 ) 2 ·3H 2 O, 2mmol Co(NO 3 ) 2 ·6H 2 O and 5 mmol of hexamethylenetetramine were added into the beaker to obtain a homogeneous solution. Transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, insert the pre-treated nickel foam obliquely into the solution, seal it and react in an oven at 120°C for 6 hours, and cool it naturally to room temperature after the reaction is over. The nickel foam covering the sample was washed three times with deionized water and absolute ethanol, and then the nickel ...

Embodiment 2

[0057] Cu-doped Co(OH) 2 A method for preparing a nanosheet array structure material, comprising the following steps:

[0058] Accurately measure 20mL deionized water and 15mL methanol into a clean beaker, then weigh 0.1mmol or 0.3mmol Cu(NO 3 ) 2 ·3H 2 O, 2mmol Co(NO 3 ) 2 ·6H 2 O and 5mmol hexamethylenetetramine were added into the beaker and stirred evenly. Insert the dried nickel foam obliquely into a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, transfer the solution to the reaction kettle after the solution is fully dissolved, and react in an oven at 120°C for 6 hours after sealing. After the reaction was finished, it was naturally cooled to room temperature, and the nickel foam covering the sample was washed three times with deionized water and absolute ethanol, and then the nickel foam covering the sample was dried in an oven at 60°C for 8 hours. Cu(NO 3 ) 2 ·3H 2 When the amount of O added is 0.1 mmol, the Cu-doped Co(OH) with a Cu dopi...

Embodiment 3

[0063] A Cu-doped Co(OH) 2 Application of nanosheet array structure materials as catalysts for urea oxidation reaction (UOR).

[0064] The specific application method is: doping Co(OH) with Cu with an area of ​​0.5×0.5cm 2 The nanosheet array structure material was used as the working electrode, and the Pt wire and Ag / AgCl electrode were used as the counter electrode and reference electrode, respectively. The CHI760E electrochemical workstation was used for testing in 1.0M KOH and 0.33M urea electrolyte solutions. Co(OH) prepared on nickel foam and nickel foam supported by commercial Pt / C, respectively 2 Nanosheets were used as working electrodes, and their UOR properties were measured for comparison, Co(OH) 2 The preparation is to omit the Cu(NO in the raw material on the basis of embodiment 1 3 ) 2 ·3H 2 O prepared. Using linear sweep voltammetry (LSV) at 5.0mV s -1 Polarization curves were obtained at a scan rate of 90% and an ohmic compensation of 90%.

[0065] F...

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Abstract

The invention discloses a Cu-doped cobalt hydroxide nanosheet array structure material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a copper salt, a cobalt salt and hexamethylenetetramine in a mixed solvent of water and methanol, transferring the solution into a reaction kettle, obliquely placing foamed nickel into the solution,carrying out solvothermal reaction, cooling to room temperature after the reaction is finished, and washing and drying the product to obtain the Cu-doped Co(OH)2 nanosheet array structure material. According to the Cu-doped Co(OH)2 nanosheet array structure disclosed by the invention, the electronic structure of Co(OH)2 can be effectively adjusted by utilizing Cu doping, the resistance is reduced, the active sites are increased, the hydrophilicity is improved, and the electron transfer rate is increased; the Cu-doped Co(OH)2 nanosheet array structure material is used as an electrocatalyst forurea oxidation reaction, hydrogen evolution reaction and full urea electrolysis reaction, has the advantages of high activity, good durability, simple preparation process and low cost, and has a veryhigh value for researching the practical application of a hydrogen production 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 a Cu-doped cobalt hydroxide nanosheet array structure material and its preparation method and application. Background technique [0002] Currently, hydrogen is considered as one of the most attractive energy sources to replace traditional fossil fuels because of its high energy density and environmental protection. Water electrolysis for hydrogen production has been considered as a sustainable and promising pathway, but a considerable potential is usually required for sustained hydrogen production due to the slow kinetics of the anodic oxygen evolution reaction (OER). And in the whole water electrolysis process, H 2 and O 2 Simultaneously, explosive H may be formed 2 / O 2 mixture. Therefore, it is very necessary to develop feasible methods to replace OER with a more facile oxidation reaction to achieve efficient, s...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/86H01G11/24
CPCH01G11/24H01G11/30H01G11/86
Inventor 吴正翠王相宇高峰
Owner ANHUI NORMAL UNIV
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