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a w 18 o 49 /niwo 4 Preparation method of /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 low specific surface area, poor conductivity, instability, etc.

Active Publication Date: 2021-07-06
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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  • a w <sub>18</sub> o <sub>49</sub> /niwo <sub>4</sub> Preparation method of /nf self-supporting electrocatalytic material
  • a w <sub>18</sub> o <sub>49</sub> /niwo <sub>4</sub> Preparation method of /nf self-supporting electrocatalytic material
  • a w <sub>18</sub> o <sub>49</sub> /niwo <sub>4</sub> Preparation method of /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

a W 18 O 49 / NiWO 4 / NF self-supporting electrocatalytic material preparation method, Na 2 WO 4 ·2H 2 O and Ni (CH 3 COO) 2 ·4H 2 O is added to deionized water in turn to obtain mixed solution A; mixed solution A is loaded into a polytetrafluoroethylene-lined high pressure reactor for hydrothermal reaction, and the reactants are washed and dried to obtain NiWO by calcination 4 Crystallization; NiWO 4 Crystallization and WCl 6 Add in dehydrated alcohol successively to obtain solution C; Pour solution C into a polytetrafluoroethylene-lined autoclave, then place nickel foam in a polytetrafluoroethylene reaction kettle to carry out hydrothermal reaction, and the final reactant is Centrifugal washing with absolute ethanol and drying to obtain W 18 O 49 / NiWO 4 / NF self-supporting electrocatalytic material. The invention has the advantages of low reaction temperature, mild conditions, easy realization, simple preparation process, low cost, easy process control and environmental friendliness, and the prepared W 18 O 49 / NiWO 4 / NF electrocatalytic material, showing excellent electrocatalytic hydrogen and oxygen production performance.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C25B1/04C25B11/091C25B11/031
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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