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Preparation method of OER composite electrocatalyst

An electrocatalyst and uniform mixing technology, applied in the field of material chemistry, can solve the problems of weak bonding force of metal catalysts, inability of metals to be dispersed uniformly, poor stability, etc., to improve the efficiency of electrocatalytic oxygen evolution, excellent electrocatalytic performance and avoid aggregation Effect

Active Publication Date: 2019-09-27
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the active groups of graphene and carbon nanotubes are limited, and the bonding force between metal catalysts and graphene and carbon nanotubes is weak, which leads to the uneven dispersion of metals and poor stability.

Method used

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  • Preparation method of OER composite electrocatalyst
  • Preparation method of OER composite electrocatalyst
  • Preparation method of OER composite electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method for OER composite electrocatalyst, comprising the following steps:

[0037] (1) adopting TEMPO oxidation method to prepare nanocellulose suspension, the mass fraction of nanocellulose suspension is 0.3wt.%;

[0038] (2) Weigh 0.173g Ni(NO 3 ) 2 ·6H 2 O, 0.060g Fe(NO 3 ) 3 9H 2 O and 0.05g thiourea were dissolved in 10g ultrapure water, stirred for 1h;

[0039] (3) Weigh 19.1 g of nanocellulose (CNF) suspension with a weight fraction of 0.3wt.% and add it to the mixed solution in step (2), stir for 2 hours to obtain a uniform mixed solution;

[0040] (4) hydrothermally reacting the homogeneous mixed solution obtained in step (3) at 120° C. for 2 hours, and cooling naturally to obtain a hydrogel;

[0041] (5) Vacuum freeze-drying the hydrogel obtained in step (4) at -50°C for 3 days to obtain a porous airgel material;

[0042] (6) the porous airgel material obtained in the step (5) in N 2 Under protection, heat preservation at 800° C. for 2 h...

Embodiment 2

[0049] A preparation method for OER composite electrocatalyst, comprising the following steps:

[0050] (1) adopting TEMPO oxidation method to prepare nanocellulose suspension, the mass fraction of nanocellulose suspension is 0.3wt.%;

[0051] (2) Weigh 0.173g Ni(NO 3 ) 2 ·6H 2 O, 0.12g Fe(NO 3 ) 3 9H 2 O and 0.05g thiourea were dissolved in 10g ultrapure water, stirred for 1h;

[0052] (3) Weigh 19.1 g of nanocellulose (CNF) suspension with a weight fraction of 0.3wt.% and add it to the mixed solution in step (2), stir for 2 hours to obtain a uniform mixed solution;

[0053] (4) hydrothermally reacting the homogeneous mixed solution obtained in step (3) at 120° C. for 2 hours, and cooling naturally to obtain a hydrogel;

[0054] (5) Vacuum freeze-drying the hydrogel obtained in step (4) at -50°C for 3 days to obtain a porous airgel material;

[0055] (6) the porous airgel material obtained in the step (5) in N 2 Under protection, heat preservation at 800° C. for 2 ho...

Embodiment 3

[0058] A preparation method for OER composite electrocatalyst, comprising the following steps:

[0059] (1) adopting TEMPO oxidation method to prepare nanocellulose suspension, the mass fraction of nanocellulose suspension is 0.3wt.%;

[0060] (2) Weigh 0.173g Ni(NO 3 ) 2 ·6H 2 O, 0.06g Fe(NO 3 ) 3 9H 2 O and 0.05g thiourea were dissolved in 10g ultrapure water, stirred for 1h;

[0061] (3) Weighing 51.1 g of nanocellulose (CNF) suspension with a weight fraction of 0.3wt.% and adding it to the mixed solution in step (2), stirring for 2 hours to obtain a uniform mixed solution;

[0062] (4) hydrothermally reacting the homogeneous mixed solution obtained in step (3) at 120° C. for 2 hours, and cooling naturally to obtain a hydrogel;

[0063] (5) Vacuum freeze-drying the hydrogel obtained in step (4) at -50°C for 3 days to obtain a porous airgel material;

[0064] (6) the porous airgel material obtained in the step (5) in N 2 Under protection, heat preservation at 800° C...

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Abstract

The invention discloses a preparation method of an OER composite electrocatalyst, comprising the following steps: (1) uniformly mixing a nickel source, an iron source and thiourea, adding a nanocellulose suspension, and stirring for 1-4 hours to obtain a uniform mixed solution; (2) carrying out a hydrothermal reaction on the uniform mixed solution obtained in the Step (1), and naturally cooling to obtain hydrogel; (3) vacuum-drying the hydrogel obtained in the Step (2) to obtain a porous aerogel material; and (4) calcining the porous aerogel material obtained in the Step (3) to obtain an OER composite electrocatalyst. The transition metal / carbon composite electrocatalyst prepared in the invention has excellent OER electrocatalytic performance and stability. The current density can reach 10 mA.cm<-2> at overpotential of 244 mV, and the overpotential is 66 mV lower than the overpotential of a commercial noble metal oxide (RuO2).

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of an electrocatalyst. Background technique [0002] With the development of society, the rapid growth of global energy demand, the decline of fossil fuel reserves and the climate problems caused by the use of fossil fuels make it very important to explore renewable and clean energy. Hydrogen is a clean and efficient energy carrier, as well as an important chemical raw material. It has the advantages of high energy density, high combustion calorific value, and clean combustion products. It can be used as an effective supplement or even a substitute for fossil energy. Among them, electrocatalytic water splitting to generate hydrogen has been widely regarded as one of the most promising approaches to meet future energy demands with minimal environmental impact. [0003] The water electrolysis reaction includes the oxygen evolution reaction (OER) a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/091B01J35/33Y02P20/133
Inventor 田翠花吴义强卿彦罗莎刘至辰杨田韵
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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