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Bifunctional oxygen electrocatalyst and preparation and application thereof

A catalyst, bifunctional technology, applied in bifunctional oxygen electrocatalyst and its preparation and application fields, to achieve the effects of high capacity, easy scale and sustainable production, and excellent stability

Active Publication Date: 2021-05-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, there is still a lack of an ORR / OER bifunctional catalyst with both high activity and excellent stability.

Method used

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  • Bifunctional oxygen electrocatalyst and preparation and application thereof
  • Bifunctional oxygen electrocatalyst and preparation and application thereof
  • Bifunctional oxygen electrocatalyst and preparation and application thereof

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Experimental program
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preparation example Construction

[0041] The preparation method of the above-mentioned catalyst is also disclosed in the embodiment of the application, including the following steps:

[0042] 1) uniformly mixing the metal salt of the element A, the metal salt of the element B, and the metal salt of the element C with carbohydrates and gas-generating compounds in water to form a precursor solution;

[0043] 2) Pre-calcining the precursor solution; calcining the product obtained by the pre-calcining to obtain the catalyst.

[0044] Optionally, the preparation method of the catalyst consists of the above steps.

[0045] In the embodiment of the present application, the precursor solution is pre-fired in an oven to obtain a three-dimensional foam supported by a metal salt;

[0046] In the embodiment of the present application, the carbohydrate is selected from chitosan, sucrose, fructose, glucose, maltose, cellulose, starch, hemicellulose, mannose, fructan, xylitol, arabinose, erythrose Any one or more of sugar,...

Embodiment 1

[0058] (1) Weigh a certain amount of K 2 PtCl 6 and FeCl 3 Dissolve in deionized water so that the total concentration of metal salts is 0.1mol / L, where Pt 4+ and Fe 3+ The concentration is 0.05mol / L.

[0059] (2) Add chitosan and ammonium chloride subsequently, obtain a clear solution through continuous stirring, the concentration of chitosan is 1mol / L, and the concentration of ammonium chloride is 4mol / L.

[0060] (3) After that, the beaker was put into an oven and pre-fired at 160° C. for 10 h to obtain a three-dimensional metal salt-loaded chitosan foam.

[0061] (4) Finally, put the obtained foam into a muffle furnace, calcinate at 600°C for 12 hours under an argon atmosphere, wash and dry with deionized water to obtain a PtFe-based mixed catalyst Pt 0.5 Fe 0.5 o 2 .

Embodiment 2

[0063] (1) Weigh a certain amount of K 2 PtCl 6 and FeCl 3 Dissolve in deionized water so that the total concentration of metal salts is 0.01mol / L, where Pt 4+ and Fe 3+ The concentration is 0.005mol / L.

[0064] (2) Then add sucrose and ammonium sulfate, and continuously stir to obtain a clear solution, the concentration of sucrose is 0.1 mol / L, and the concentration of ammonium sulfate is 0.1 mol / L.

[0065] (3) Afterwards, the beaker was put into an oven and pre-fired at 120° C. for 2 hours to obtain a three-dimensional metal salt-loaded sucrose foam.

[0066] (4) Finally, put the obtained foam into a muffle furnace, calcinate at 350°C for 6h, wash and dry with deionized water to obtain a PtFe-based mixed oxide catalyst Pt 0.5 Fe 0.5 o 2 .

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Abstract

The invention discloses a bifunctional oxygen electrocatalyst and a preparation method and application thereof. The catalyst is A1-x-yBxCyO2, the element A is selected from one of Pt, Ir, Ru and Pd, the element B and the element C are selected from Mo, Mn, Fe, Co, Ni, Cu and Zn, and optionally, the element B is the same as the element C. The catalyst is prepared by taking chitosan, cane sugar, fructose, glucose, maltose and the like as templates, taking thiourea, ammonium chloride, urea, ammonium sulfate and the like as gas generating agents to obtain metal salt loaded three-dimensional foam, and conducting calcining. The preparation method provided by the invention has the characteristics of being simple, convenient, efficient, low in cost, environment-friendly and the like, and the obtained catalyst has very excellent electro-catalytic oxygen reduction (ORR) and oxygen evolution (OER) performance and also shows excellent performance in a zinc-air battery.

Description

technical field [0001] This article relates to but not limited to the field of bifunctional oxygen electrocatalysts, especially a bifunctional oxygen electrocatalyst and its preparation and application. Background technique [0002] Zinc-air battery is a new type of green and environment-friendly energy battery. It has the advantages of high energy density, stable discharge voltage, low raw material cost, and high safety. Therefore, it is considered to be a new type of battery with great development prospects. The positive electrode of zinc-air battery can directly use oxygen in the air as fuel, which has inexhaustible advantages compared with other positive electrode non-renewable batteries. The negative electrode zinc material has the advantages of abundant reserves, high utilization rate, high energy density, and low cost. , which is considered by many researchers to be an ideal power source for electric vehicles. However, the current commercial zinc-air batteries are ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00H01M4/92H01M12/08
CPCC01G55/00C01G55/002H01M4/923H01M12/08C01P2004/03C01P2004/04C01P2004/62Y02E60/50H01M4/9016H01M12/06H01M4/90H01M2004/8689
Inventor 张如范周晨晖蒙海兵韩莹
Owner TSINGHUA UNIV
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