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Multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and preparation method thereof

A dual-functional catalysis, multi-metal technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of complex preparation process and unstable catalytic activity, increase specific surface area, promote Electron transfer during adsorption and desorption and catalysis, high porosity effect

Active Publication Date: 2019-06-25
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] In recent years, MOFs-derived carbon-based non-precious metal catalytic materials have made breakthrough research progress and are expected to become a strong candidate to replace traditional noble metal catalysts, but there are still problems such as complex preparation process and unstable catalytic activity. How to overcome difficulties Obtaining sustainable, efficient and cheap non-precious metal catalysts is the next challenge that researchers need to face

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  • Multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and preparation method thereof
  • Multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and preparation method thereof
  • Multi-metal MOFs derived oxygen reduction/oxygen evolution double-function catalytic material, and preparation method thereof

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Embodiment 1

[0032] Such as figure 1 As shown, a method for preparing an oxygen reduction / oxygen evolution bifunctional catalytic material derived from multimetal MOFs, the steps are as follows:

[0033] (1) Preparation of the precursor: First, weigh 9.6 mmol of Zn(NO 3 ) 2 ·6H 2 O, 2.4mmol of Co(NO 3 ) 2 ·6H 2 O and 0.24mmol of FeSO 4 ·7H 2The O mixture was dissolved in 125 mL of methanol, and stirred evenly to obtain solution A. Next, weigh 48mmol of 2-methylimidazole and dissolve it in 45mL of methanol, and stir evenly to obtain solution B. Then solution A was slowly poured into solution B, the mixture was stirred at room temperature for 25 minutes, and the precursor product could be obtained after 24 hours of co-precipitation reaction at room temperature. Finally, the obtained product was centrifuged and washed three times with absolute ethanol and deionized water respectively, and dried in a vacuum oven at 60°C for 24 hours, recorded as Zn 0.8 co 0.2 Fe 0.02 -ZIF (Zn / Co / Fe...

Embodiment 2

[0039] Such as figure 1 As shown, a method for preparing an oxygen reduction / oxygen evolution bifunctional catalytic material derived from multimetal MOFs, the steps are as follows:

[0040] (1) Preparation of the precursor: First, weigh 7.2 mmol of Zn(NO 3 ) 2 ·6H 2 O, 4.8mmol of Co(NO 3 ) 2 ·6H 2 O and 0.48mmol of FeSO 4· 7H 2 The O mixture was dissolved in 125 mL of methanol, and stirred evenly to obtain solution A. Next, weigh 48mmol of 2-methylimidazole and dissolve it in 45mL of methanol, and stir evenly to obtain solution B. Then solution A was slowly poured into solution B, the mixture was stirred at room temperature for 25 minutes, and the precursor product could be obtained after 24 hours of co-precipitation reaction at room temperature. Finally, the obtained product was centrifuged and washed three times with absolute ethanol and deionized water respectively, and dried in a vacuum oven at 60°C for 24 hours, recorded as Zn 0.6 co 0.4 Fe 0.04 -ZIF (Zn / Co / F...

Embodiment 3

[0046] Such as figure 1 As shown, a method for preparing an oxygen reduction / oxygen evolution bifunctional catalytic material derived from multimetal MOFs, the steps are as follows:

[0047] (1) Preparation of the precursor: First, weigh 6.0 mmol of Zn(NO 3 ) 2 ·6H 2 O, 6.0mmol of Co(NO 3 ) 2 ·6H 2 O and 0.6mmol of FeSO 4 ·7H 2 The O mixture was dissolved in 125 mL of methanol, and stirred evenly to obtain solution A. Next, weigh 48mmol of 2-methylimidazole and dissolve it in 45mL of methanol, and stir evenly to obtain solution B. Then solution A was slowly poured into solution B, the mixture was stirred at room temperature for 25 minutes, and the precursor product could be obtained after 24 hours of co-precipitation reaction at room temperature. Finally, the obtained product was centrifuged and washed three times with absolute ethanol and deionized water respectively, and dried in a vacuum oven at 60°C for 24 hours, recorded as Zn 0.5 co 0.5 Fe 0.05 -ZIF (Zn / Co / Fe...

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Abstract

The invention discloses a multi-metal MOFs derived oxygen reduction / oxygen evolution double-function catalytic material, and a preparation method thereof. The preparation method comprises following steps: room temperature coprecipitation is adopted to synthesis a Zn / Co / Fe multi-metal ZIF precursor; then sulfuration and sintering treatment technology is adopted for combination of oxygen reduction reaction (ORR) active sites (Co / Fe-N-C) and oxygen evolution reaction (OER) active sites (Co / Fe-S) on a monomer material, so that the double ORR / OER electrocatalyst which is low in cost and possesses the performance as good as that of commercially available catalysts is obtained. According to the preparation method, two important factors, including active site distribution and catalytic mechanism,with great influences on material performance are taken into comprehensive consideration, realization of the optimal material catalytic oxidation reduction / oxygen evolution reaction efficiency is taken as a design principle, optimization design is adopted to obtain the best Zn / Co / Fe ratio in the precursor, and the catalyst is provided with the best catalytic performance. The multi-metal MOFs derived oxygen reduction / oxygen evolution double-function catalytic material possesses both high efficiency oxygen reduction and oxygen evolution performance, is high in specific surface area, is abundantin micropores, and is uniform in active site dispersion; and the cost is much lower than that of commercially available precious metal catalyst catalytic materials.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials, in particular to an oxygen reduction / oxygen evolution bifunctional catalytic material derived from multimetal MOFs and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of electrochemical-to-electrical energy conversion devices such as fuel cells, zinc-air batteries, and electrolyzed water, people have achieved efficient, orderly, clean and pollution-free conversion of energy. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are some of the key reactions involved in this type of electrochemical-to-electrical energy conversion device. However, the slow kinetics of the ORR reaction and OER reaction will greatly reduce the energy conversion efficiency, and an external catalyst is usually required to accelerate the reaction. The commercial catalysts currently used are mainly Pt / C, RuO 2 and IrO 2 However, the scarc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90C25B1/04C25B11/06
CPCY02E60/36Y02E60/50
Inventor 李明佳杨毅文宋秉烨黄东王睿龙
Owner XI AN JIAOTONG UNIV
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