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Low-crystallization graded nickel oxyhydroxide nano-sheet array and preparation method and application thereof

A technology of nickel oxyhydroxide and nanosheet arrays, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc. Contact and other issues to achieve the effect of increasing quantity, high quality specific activity catalytic performance, and improving mass specific activity

Active Publication Date: 2019-10-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, deep reconstitution based on bulk materials is a great challenge due to the dense surface layer formed by reconstitution that hinders the contact between the procatalyst and the electrolyte.
Although the electrode polarization induced by lithiation will cause the electrode material to pulverize and lead to the degradation of battery performance, the nanonization of materials induced by lithiation can be used to prepare ultra-small nanomaterials
Previous work has reported the application of lithiation regulation in electrocatalysis, but the lithiation strategy for catalyst reconstruction and its mechanism have not been reported

Method used

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  • Low-crystallization graded nickel oxyhydroxide nano-sheet array and preparation method and application thereof
  • Low-crystallization graded nickel oxyhydroxide nano-sheet array and preparation method and application thereof
  • Low-crystallization graded nickel oxyhydroxide nano-sheet array and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the low-crystalline graded nickel oxyhydroxide nanosheet array includes:

[0037] 1) Weigh 3mmol Ni(NO 3 ) 2 ·6H 2 O, 2 mmol NH 4 F and 5mmol CO(NH 2 ) 2 Dissolve in 35mL deionized water, stir to obtain a clear and transparent mixed solution;

[0038] 2) Transfer the mixed solution obtained in step 1) to a reaction kettle, and add commercial metal nickel foam with a size of 2cm*4cm. After hydrothermal reaction at 120°C for 6 hours, take out the nickel foam sample after natural cooling, and use alcohol and After washing with water and drying, the nickel hydroxide nanosheet array precursor was obtained;

[0039] 3) Calcining the nickel hydroxide nanosheet array precursor obtained in step 2) in a muffle furnace at 400° C. for 3 hours to obtain a nickel oxide nanosheet array grown on nickel foam;

[0040] 4) Cut the nickel foam sample obtained in step 3) into discs with a diameter of 1 cm; assemble a lithium-ion half-cell, fully discharge to...

Embodiment 2

[0045] The preparation method of the low-crystalline graded nickel oxyhydroxide nanosheet array includes:

[0046] 1) Weigh 2.5mmol Ni(NO 3 ) 2 ·6H 2 O, 2 mmol NH 4 F and 5mmol CO(NH 2 ) 2 Dissolve in 35mL deionized water, stir to obtain a clear and transparent mixed solution;

[0047] 2) Transfer the mixed solution obtained in step 1) to a reaction kettle, and add commercial metal nickel foam with a size of 2cm*4cm. After hydrothermal reaction at 120°C for 6 hours, take out the nickel foam sample after natural cooling, and use alcohol and After washing with water and drying, the nickel hydroxide nanosheet array precursor was obtained;

[0048] 3) Calcining the nickel hydroxide nanosheet array precursor obtained in step 2) in a muffle furnace at 400° C. for 3 hours to obtain a nickel oxide nanosheet array grown on metallic nickel foam;

[0049] 4) Cut the nickel foam sample obtained in step 3) into discs with a diameter of 1 cm; assemble a lithium-ion half-cell, fully d...

Embodiment 3

[0053] The preparation method of the low-crystalline graded nickel oxyhydroxide nanosheet array includes:

[0054] 1) Weigh 3mmol Ni(NO 3 ) 2 ·6H 2 O, 2 mmol NH 4 F and 5mmol CO(NH 2 ) 2 Dissolve in 35mL deionized water, stir to obtain a clear and transparent mixed solution;

[0055] 2) Transfer the mixed solution obtained in step 1) to a reaction kettle, and add a commercial metallic nickel foam with a size of 3cm*3cm. After hydrothermal reaction at 120°C for 6 hours, take out the nickel foam sample after natural cooling, and wash with alcohol and After washing with water and drying, the nickel hydroxide nanosheet array precursor was obtained;

[0056] 3) Calcining the nickel hydroxide nanosheet array precursor obtained in step 2) in a muffle furnace at 400° C. for 3 hours to obtain a nickel oxide nanosheet array grown on metallic nickel foam;

[0057] 4) Cut the nickel foam sample obtained in step 3) into discs with a diameter of 1 cm; assemble a lithium-ion half-cell...

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Abstract

The invention belongs to the technical field of nano-catalysts and electrochemical energy conversion, and in particular relates to a low-crystallization graded nickel oxyhydroxide nano-sheet array anda preparation method and application thereof. The low-crystallization graded nickel oxyhydroxide nano-sheet array can be used as a catalyst for oxygen evolution reaction and urea oxidation reaction and is applied to electrochemical energy conversion. The low-crystallization graded nickel oxyhydroxide nano-sheet array is obtained by growing nickel oxyhydroxide nano sheets on metal foam nickel, andthe nickel oxyhydroxide nano sheets are assembled by ultra-small nickel oxyhydroxide nano-particles below 5 nm, and the nano-sheets have the characteristics of low crystallinity and grading. The low-crystallization graded nickel oxyhydroxide nano-sheet array has the beneficial effects the by constructing the low-crystallization graded nickel oxyhydroxide nano-sheet array, the number of catalytically active species is effectively increased, the, and the mass specific activity of the catalyst is improved. The application of the low-crystallization graded nickel oxyhydroxide nano-sheet array toalkaline oxygen evolution reaction and urea oxidation reaction shows high mass specific activity catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of nano-catalyst and electrochemical energy conversion, and specifically relates to a low-crystalline graded nickel oxyhydroxide nanosheet array and its preparation method and application, which can be used as a catalyst for oxygen evolution reaction and urea oxidation reaction and applied to electrochemical energy conversion. Background technique [0002] Oxygen evolution reaction (OER) and urea oxidation reaction (UOR) are important reactions in electrochemical energy storage and conversion. Since the catalytic reaction process is usually a complex multi-electron transfer reaction, a high overpotential is required to drive the reaction. It is significant and challenging to develop efficient and stable non-precious metal-based OER and UOR catalysts. Transition metal nickel-based catalysts as alternatives to commercial IrO 2 , RuO 2 The potential of catalysts has been extensively studied. However, for la...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/02C25B11/03C25B11/06
CPCB01J23/755C25B11/031C25B11/051C25B11/057C25B11/077B01J35/33B01J35/00B01J35/30
Inventor 麦立强刘熊温波郭瑞婷
Owner WUHAN UNIV OF TECH
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