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A kind of bifunctional catalyst for oxygen evolution and oxygen reduction and preparation method thereof

A dual-function catalyst and oxygen precipitation technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of large reserves, low cost of binary nickel-cobalt-based catalysts, and binary nickel-cobalt The problem of poor catalyst conductivity and long-term stability, to achieve the effect of good methanol tolerance and stability

Active Publication Date: 2022-05-24
UNIV OF JINAN
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Problems solved by technology

[0004] (1) Binary NiCo-based catalysts are low in cost, large in reserves, and highly active in OER and ORR, while bare binary NiCo-based catalysts usually have poor electrical conductivity and long-term stability
[0005] (2) How to construct bifunctional catalysts with enhanced catalytic activity and catalytic stability, especially with weakened Ostwald effect in OER and ORR processes, remains challenging.

Method used

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  • A kind of bifunctional catalyst for oxygen evolution and oxygen reduction and preparation method thereof
  • A kind of bifunctional catalyst for oxygen evolution and oxygen reduction and preparation method thereof
  • A kind of bifunctional catalyst for oxygen evolution and oxygen reduction and preparation method thereof

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preparation example Construction

[0033] like figure 1 As shown, the preparation method of the bifunctional catalyst for oxygen evolution and oxygen reduction provided by the embodiment of the present invention includes:

[0034] S101, take foamed nickel, immerse it in HCl solution, take it out, wash it with deionized water, and then dry it in an oven;

[0035] S102, put the nickel foam of step 1 into a layer containing 0.2M CoCl 2 ·6H 2 O and 0.1M NiCl 2 ·6H 2 The nickel-cobalt hydroxide composite was deposited on the surface of nickel foam by cyclic voltammetry in a solution of O;

[0036] S103, taking out the nickel foam obtained after electrodeposition in step 2, washing with water and ethanol three times, and putting it into an oven to dry;

[0037] S104, the nickel foam of step 3 and melamine mixture and thiourea are respectively placed in the lower tuyere part and the upper tuyere part of the double-zone temperature control tube furnace, heated to 520 ° C, and kept in the tube furnace for 2 hours; ...

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Abstract

The invention belongs to the technical field of oxidant preparation, and discloses a dual-function catalyst for oxygen precipitation and oxygen reduction and a preparation method thereof. The nickel foam is immersed in HCl solution, cleaned with deionized water, and then dried in an oven; Put the nickel foam into the containing CoCl 2 ·6H 2 O and NiCl 2 ·6H 2 In the solution of O, cyclic voltammetry is used to deposit nickel hydroxide cobalt composite material on the surface of nickel foam; the foam nickel obtained after electrodeposition is taken out, washed and dried; the mixture of foam nickel and melamine and thiourea are placed in the double zone respectively The temperature controls the downwind portion and the upwind portion of the tube furnace for heating. The onset potential of the catalyst of the present invention is 1.52V (vs.RHE) in OER, and in ORR, compared with 20% commercial Pt / C, the onset potential is 0.95V (vs.RHE), which has better Methanol tolerance and stability.

Description

technical field [0001] The invention belongs to the technical field of oxidant preparation, and in particular relates to a bifunctional catalyst for oxygen evolution and oxygen reduction and a preparation method thereof. Background technique [0002] Currently: Oxygen evolution (OER) and oxygen reduction (ORR) reactions play crucial roles in electrochemical conversion technologies and energy storage such as water electrolysis and fuel cells. Highly active and stable bifunctional electrocatalysts are the key to OER and ORR. Currently, iridium (Ir) and ruthenium (Ru) are the most efficient electrocatalysts for OER, and platinum (Pt) is the most efficient electrocatalyst for ORR, but their high cost and scarce resources hinder their large-scale applications. Therefore, there is an urgent need to develop low-cost, efficient and durable alternatives. Therefore, various types of materials, especially transition metal-based catalysts, have been extensively studied. Among them, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24H01M4/90
CPCB01J27/24H01M4/90H01M4/9083B01J35/33Y02E60/50
Inventor 赵振路高存源怀杰沙骑骑王建荣
Owner UNIV OF JINAN
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