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Preparation method of W18O49/NiWO4/NF self-supporting electrocatalytic material

An electrocatalytic material and self-supporting technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve problems such as instability, low specific surface area, poor conductivity, etc., and achieve process controllability, reaction The effect of low temperature and simple preparation process

Active Publication Date: 2019-05-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the disadvantages of most transition metal catalysts, such as instability, poor electrical conductivity, and low specific surface area, need to be further improved

Method used

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  • Preparation method of W18O49/NiWO4/NF self-supporting electrocatalytic material
  • Preparation method of W18O49/NiWO4/NF self-supporting electrocatalytic material
  • Preparation method of W18O49/NiWO4/NF self-supporting electrocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Take Na at a molar ratio of 1:1 2 WO 4 2H 2 O and Ni(CH 3 COO)2 4H 2 O, the Na 2 WO 4 2H 2 O and Ni(CH 3 COO) 2 4H 2 O was added to 40mL deionized water and stirred evenly to obtain Na 2 WO 4 2H 2 O concentration is 0.05mol / L, Ni(CH 3 COO) 2 4H 2 O concentration is the mixed solution A of 0.05mol / L;

[0034] 2) Put the mixed solution A into a polytetrafluoroethylene-lined autoclave with a volume filling ratio of 40%, seal the autoclave and put it into a homogeneous hydrothermal reactor for 12 hours at 160°C;

[0035] 3) Cool to room temperature after the reaction, centrifuge and wash the reactant three times with absolute ethanol and deionized water respectively, and dry the reactant after centrifugal washing in a vacuum oven or freeze drying oven at 50°C for 5 hours to obtain powder B;

[0036] 4) Grind powder B in a mortar and put it into a muffle furnace to heat up from room temperature to 450°C at a heating rate of 2°C / min for calcination to obtai...

Embodiment 2

[0045] 1) Take Na2WO4·2H at a molar ratio of 1:1 2 O and Ni(CH 3 COO) 2 4H 2 O, the Na 2 WO4·2H 2 O and Ni(CH 3 COO) 2 4H 2 O was added to 30mL deionized water and stirred evenly to obtain Na 2 WO 4 2H 2 O concentration is 0.03mol / L, Ni(CH 3 COO) 2 4H 2 O concentration is the mixed solution A of 0.03mol / L;

[0046] 2) Put the mixed solution A into a polytetrafluoroethylene-lined autoclave with a volume filling ratio of 30%, seal the autoclave and put it into a homogeneous hydrothermal reactor for 12 hours at 180°C;

[0047] 3) Cool to room temperature after the reaction, centrifuge and wash the reactant three times with absolute ethanol and deionized water respectively, and dry the reactant after centrifugal washing in a vacuum oven or freeze drying oven at 50°C for 5 hours to obtain powder B;

[0048] 4) Grind powder B in a mortar and put it into a muffle furnace to heat up from room temperature to 470°C at a heating rate of 2°C / min for calcination to obtain NiW...

Embodiment 3

[0057] 1) Take Na at a molar ratio of 1:1 2 WO 4 2H 2 O and Ni(CH 3 COO) 2 4H 2 O, the Na 2 WO 4 2H 2 O and Ni(CH 3 COO) 2 4H 2 O was added to 35mL deionized water and stirred evenly to obtain Na 2 WO 4 2H 2 O concentration is 0.08mol / L, Ni(CH 3 COO) 2 4H 2 O concentration is the mixed solution A of 0.08mol / L;

[0058] 2) Put the mixed solution A into a polytetrafluoroethylene-lined autoclave with a volume filling ratio of 35%, seal the autoclave and put it into a homogeneous hydrothermal reactor for 28 hours at 150°C;

[0059] 3) Cool to room temperature after the reaction, centrifuge and wash the reactant three times with absolute ethanol and deionized water respectively, and dry the reactant after centrifugal washing in a vacuum oven or freeze drying oven at 50°C for 6 hours to obtain powder B;

[0060] 4) Grind powder B in a mortar and put it into a muffle furnace to heat up from room temperature to 450°C at a heating rate of 2°C / min for calcination to obt...

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Abstract

The invention relates to a preparation method of a W18O49 / NiWO4 / NF self-supporting electrocatalytic material. The preparation method includes the steps that Na2WO4.2H2O and Ni(CH3COO)2.4H2O are successively added to deionized water to obtain a mixed solution A; the mixed solution A is loaded into the a polytetrafluoroethylene lined high-pressure reactor for a hydrothermal reaction, and NiWO4 crystals are obtained by washing, drying and calcining reactants; the NiWO4 crystals and a WCl6 are successively added to absolute ethyl alcohol to obtain a solution C; the solution C is poured into the polytetrafluoroethylene lined high-pressure reactor, then foamed nickel is placed in the polytetrafluoroethylene lined high-pressure reactor for the hydrothermal reaction, final reactants are subjectedto centrifugal washing and drying with the absolute ethyl alcohol to obtain the W18O49 / NiWO4 / NF self-supporting electrocatalytic material. According to the preparation method of the W18O49 / NiWO4 / NF self-supporting electrocatalytic material, the reaction temperature is low, the condition is mild, and implementation is easy; and the preparation process is simple, the cost is low, the process is easyto control, environmental protection is achieved, the prepared W18O49 / NiWO4 / NF electrocatalytic material shows excellent properties of electrocatalytic hydrogen and oxygen production.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a W 18 o 49 / NiWO 4 / NF self-supporting electrocatalytic materials preparation method. Background technique [0002] Fossil fuel shortages and global climate deterioration are widespread concerns and urgency for researchers to develop alternative energy sources. Electrochemical electrolysis of water has been recognized as one of the most promising renewable energy conversion technologies among sustainable and clean energy resources. To ensure efficient water splitting, efficient and stable electrocatalysts with simultaneously significantly reduced overpotentials for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are required. At present, catalysts containing noble metals such as Pt and its alloys, RuO 2 and IrO 2 Still the most effective catalyst for OER and HER. However, the high cost and relative scarcity of noble metals limit their large-sca...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B1/04C25B11/06C25B11/03
CPCY02E60/36
Inventor 黄剑锋海国娟冯亮亮曹丽云介燕妮杨佳付常乐吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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