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A kind of cysteine functionalized modified iron oxyhydroxide, electrocatalyst, preparation method and application
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A technology of iron oxyhydroxide and cysteine, which is applied in the fields of electrocatalyst, preparation, and iron oxyhydroxide, which can solve the problems of poor electrocatalytic oxygen evolution performance and inability to meet the requirements of industrial applications, and achieve the improvement of electrocatalytic performance and performance Good stability and simple preparation process
Active Publication Date: 2021-10-26
ANHUI UNIVERSITY OF TECHNOLOGY
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[0004] Catalysts with high performance oxygen evolution reactions have been reported so far, including ruthenium dioxide (RuO 2 ) and iron, cobalt, manganese, nickel-based nanomaterials, etc., but these catalysts have poor electrocatalytic oxygen evolution performance and cannot meet the requirements of industrial applications.
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[0037] The preparation method of the cysteine functionalized modified iron oxyhydroxide electrocatalyst of the present invention comprises the following steps:
[0038] S1, ferricnitrate and urea are uniformly mixed in deionized water at a molar ratio of 1:5 to obtain the first mixed solution;
[0039] S2, the first mixed solution and triethanolamine are mixed according to a volume ratio of 10 to 80:1 to obtain a second mixed solution;
[0040] S3, the second mixed solution and L-cysteine are mixed and stirred uniformly according to the concentration ratio of 25-125 mmol / L to obtain a third mixed solution;
[0041] S4, placing the third mixed solution in a high-pressure reactor, and preparing cysteine-functionalized iron oxyhydroxide by hydrothermal method;
[0042] S5, add the washed and dried cysteine functionalized ferric oxyhydroxide to Nafion solution and mix, the concentration is 5mg / mL, apply it on the foamed nickel after ultrasonic evenly, and obtain cysteine ...
Embodiment 1
[0050] In this embodiment, the preparation method of the cysteine functionalized modified iron oxyhydroxide catalyst of the present invention comprises the following steps:
[0051] S1, mix 2 mmol of ferric nitrate and 10 mmol of urea in 40 ml of deionized water according to a molar ratio of 1:5 to obtain the first mixed solution;
[0052] S2, the first mixed solution and 2ml of triethanolamine are mixed according to a volume ratio of 20:1 to obtain a second mixed solution;
[0053] S3, the second mixed solution and 3 mmol of L-cysteine were mixed and stirred evenly to obtain a third mixed solution;
[0054] S4, the third mixed solution is placed in a high-pressure reaction kettle with a polytetrafluoroethylene liner, put into a vacuum drying oven, heated to 120°C, and kept for 12 hours to obtain a functionalized modified hydroxyl group of cysteine. iron;
[0055] S5, add 10 mg of washed and dried cysteine functionalized ferric oxyhydroxide into the mixed solution of 1.5...
Embodiment 2
[0061] In this example, 1 mmol of L-cysteine was used instead of 3 mmol of L-cysteine in Step S3 of Example 1 to prepare a cysteine functionalized iron oxyhydroxide catalyst, denoted as Fe- urea-2mlTEOA-1mmolCys.
[0062] Other implementation modes are as in Embodiment 1.
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Abstract
The invention discloses a functionalized cysteine modified ferric oxyhydroxide, an electrocatalyst, a preparation method and an application, comprising mixing ferricnitrate and urea in deionized water at a molar ratio of 1:5 to obtain a first mixed liquid; The first mixed solution and the alcohol solution are mixed according to the volume ratio of 10~80:1 to obtain the second mixed solution; the second mixed solution and L-cysteine are mixed and stirred according to the concentration ratio of 25mmol / L~125mmol / L to obtain the third mixed solution Mixed solution; the third mixed solution is placed in a high-pressure reactor to prepare iron oxyhydroxide; the washed and dried iron oxyhydroxide is added to Nafion solution and mixed, ultrasonically coated on foamed nickel, and dried naturally to obtain Amino acid functionalized iron oxyhydroxideelectrocatalyst; the preparation process of the invention is simple, and the prepared catalyst is applied to the electrocatalytic oxygen production reaction, and the electrocatalytic performance is greatly improved compared with unmodified iron oxyhydroxide. And it is far superior to commercial ruthenium dioxide, and the electrocatalytic oxygen evolution performance is stable, which is suitable for industrial application.
Description
technical field [0001] The invention relates to the technical field of preparation of electrocatalytic materials, in particular to a cysteine functionalized iron oxyhydroxide, electrocatalyst, preparation method and application. Background technique [0002] Environmental pollution and energy crisis prompt people to look for a new clean energy to replace fossil energy. As a renewable clean energy with high energy density, hydrogen energy has been favored by people. [0003] Electrocatalytic water splitting is a common technology for hydrogen production. However, the rate of hydrogen evolution reaction (HER) in water electrolysis is restricted by oxygen evolution reaction (OER). [0004] Catalysts with high performance oxygen evolution reactions have been reported so far, including ruthenium dioxide (RuO 2 ) and iron, cobalt, manganese, nickel-based nanomaterials, etc., but these catalysts have poor electrocatalytic oxygen evolution performance and cannot meet the requirem...
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