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Dual-function fully-hydrolyzed hydroelectric catalyst and preparation method and application thereof

A catalyst, bifunctional technology, applied in the field of bifunctional electrocatalyst for total water splitting and its preparation, can solve problems such as instability of nickel-based catalyst, and achieve the effects of facilitating electron transfer, good chemical resistance, and speeding up resistance transmission.

Active Publication Date: 2019-11-05
UNIVERSITY OF MACAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a bifunctional electrocatalyst for fully splitting water and its preparation method, which can at least improve the instability of existing nickel-based catalysts under extreme working conditions

Method used

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  • Dual-function fully-hydrolyzed hydroelectric catalyst and preparation method and application thereof
  • Dual-function fully-hydrolyzed hydroelectric catalyst and preparation method and application thereof
  • Dual-function fully-hydrolyzed hydroelectric catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0022] A method for preparing a bifunctional full-scale water electrocatalyst, comprising:

[0023] S1. Uniformly mixing the sulfur-containing monomer with chromate and a solvent to prepare a mixed solution.

[0024] In the present invention, the sulfur-containing monomer includes at least one of thioacetamide and thiourea, and the chromate includes at least one of sodium chromate tetrahydrate and thioacetamide. In a preferred embodiment of the present invention, the sulfur-containing monomer is selected as thioacetamide, and the chromate is sodium chromate tetrahydrate. In a preferred embodiment of the present invention, in order to make the preparation process more environmentally friendly, the solvent is deionized water.

[0025] A sufficient amount of thioacetamide, sodium chromate tetrahydrate and deionized water were mixed and stirred for 1 hour to make them evenly mixed to obtain a mixed solution. Preferably, the mol ratio that participates in the thioacetamide of pre...

Embodiment 1

[0041] The preparation method of the bifunctional total water splitting electrocatalyst provided in this example is:

[0042] 1. Weigh thioacetamide (3g) and sodium chromate tetrahydrate (3.774g) and dissolve them in 35ml of deionized water, and stir for 1 hour to obtain a mixed solution with a concentration of 0.194g / ml.

[0043] 2. Soak nickel foam (NF; 40*20*2mm) in 3M dilute hydrochloric acid for ten minutes, then clean it with deionized water, then ultrasonicate it with acetone for half an hour, then ultrasonicate it with deionized water for half an hour, and finally use vacuum Dry in an oven at 60°C for later use.

[0044] 3. Put the mixed solution prepared in step 1 and the treated foamed nickel into the hydrothermal reaction kettle, tighten it, and put it in an oven at 180°C for 6 hours.

[0045] 4. After the reaction, 4Cr-NiSx / NF was obtained, which was washed several times with deionized water and ethanol.

[0046] 5. Dry 4Cr-NiSx / NF in a vacuum oven at 60° C. for ...

Embodiment 2

[0048] The preparation method of the bifunctional total water splitting electrocatalyst provided in this example is basically the same as that in Example 1, the only difference being:

[0049] Sodium chromate tetrahydrate consumption is 0.9435g. The concentration of the mixed solution was 0.113 g / ml. 1Cr-NiSx / NF was produced.

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Abstract

The invention relates to the field of electrolysis water catalysts, and provides a dual-function fully-hydrolyzed hydroelectric catalyst. The catalyst comprises a carrier nickel of the net structure,chromium loaded on the carrier nickel and nickel sulfate growing on the carrier nickel. The invention further provides a preparation method of the dual-function fully-hydrolyzed hydroelectric catalyst. The method comprises the steps of mixing a sulfur-containing monomer, chromate and solvents to be uniform to obtain a mixed solution; mixing the mixed solution and foamed nickel to perform a thermalreaction. The fully-hydrolyzed hydroelectric catalyst has the functions of catalysis hydrogen evolution and catalysis oxygen evolution, the reaction overpotential of electrochemical analysis can be lowered, electron transfer of the reaction is promoted, adsorption of water molecules is accelerated, the reaction rate is increased, and the stability is good under the extreme condition. The dual-function fully-hydrolyzed hydroelectric catalyst or a dual-function catalyst prepared through the preparation method of the dual-function fully-hydrolyzed hydroelectric catalyst can be applied to electrolysis of water.

Description

technical field [0001] The invention relates to the field of electrolytic water catalysts, in particular to a bifunctional electrocatalyst for total water splitting and its preparation method and application. Background technique [0002] Currently, the excessive dependence on fossil fuels and their inevitable depletion have drawn increasing attention to global environmental pollution and energy crisis, stimulating intensive research on renewable and clean energy alternatives in recent years. Hydrogen is considered an ideal substitute for chemical fuels. Water electrolysis offers us a simple way to produce high-purity hydrogen, split into two half-reactions: the hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the anode. Both HER and OER are extremely important to the overall water splitting efficiency. Compared with the theoretical minimum value of 1.23V, commercial electrolyzed water usually works at a higher voltage of 1.8-2.0V...

Claims

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Application Information

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IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/04B01J35/33Y02E60/36
Inventor 潘晖刘东刑贵川
Owner UNIVERSITY OF MACAU
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