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A kind of α-manganese dioxide and its preparation method and a kind of electrocatalyst

A manganese dioxide and manganese sulfate technology, applied in manganese oxide/manganese hydroxide, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. control and affect the stability of the electrocatalytic performance of α-MnO, and achieve the effects of excellent oxygen reduction and oxygen evolution catalytic performance, mild reaction conditions, and good electrocatalytic performance.

Active Publication Date: 2020-05-05
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the prior art only discloses the preparation of α-MnO by redox reaction 2 , but there is no information about α-MnO 2 Medium Mn 3+ Related reports on content control methods, so that Mn 3+ The content of α-MnO is uncontrollable, which in turn affects the 2 Stability of electrocatalytic performance

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  • A kind of α-manganese dioxide and its preparation method and a kind of electrocatalyst
  • A kind of α-manganese dioxide and its preparation method and a kind of electrocatalyst
  • A kind of α-manganese dioxide and its preparation method and a kind of electrocatalyst

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preparation example Construction

[0026] The invention provides a kind of preparation method of α-manganese dioxide, comprises the following steps:

[0027] Mix manganese sulfate, potassium permanganate, water and hydrochloric acid solution, and conduct a hydrothermal reaction at 100-180°C for 0.5-72 hours to obtain α-manganese dioxide; the Mn in the α-manganese dioxide 3+ with Mn 4+ The mass ratio is 0.5 to 1.0.

[0028] In the present invention, the molar ratio of the manganese sulfate to potassium permanganate is preferably 10-15:6-10, more preferably 12-13:7-8; the manganese sulfate is preferably manganese sulfate monohydrate. In the present invention, the mass fraction of the hydrochloric acid solution is preferably 35 to 40%; the volume of the hydrochloric acid solution and the molar ratio of potassium permanganate are preferably 5 to 6 mL: 6 to 10 mmol; the hydrochloric acid solution to water The volume ratio is preferably 3-5:70-90.

[0029] In the present invention, the mixing is preferably to firs...

Embodiment 1

[0044] Dissolve 2.04g of manganese sulfate monohydrate and 1.27g of potassium permanganate in 80mL of deionized water, stir magnetically for 15min, then add 4mL of hydrochloric acid solution with a mass concentration of 37%, and stir for 5min to obtain a mixed solution; transfer the mixed solution Put it into a 100mL hydrothermal reaction kettle with a stainless steel shell and a polytetrafluoroethylene liner, and place the hydrothermal reaction kettle in a blast drying oven, heat it to 150°C for 0.5h of hydrothermal reaction, and let the resulting hydrothermal reaction system naturally After being cooled to room temperature, the obtained hydrothermal reaction product is vacuum-filtered on a sand core suction filter device (using a water-based fiber filter membrane with a pore size of 0.15 μm); the filtered solid material is placed in a blast drying oven and Dry at 80°C to obtain α-manganese dioxide, denoted as MnO 2 -150-0.5.

Embodiment 2

[0046] Dissolve 2.04g of manganese sulfate monohydrate and 1.27g of potassium permanganate in 80mL of deionized water, stir magnetically for 15min, then add 4mL of hydrochloric acid solution with a mass concentration of 37%, and stir for 5min to obtain a mixed solution; transfer the mixed solution Put it into a 100mL hydrothermal reaction kettle with a stainless steel shell and a polytetrafluoroethylene liner, and place the hydrothermal reaction kettle in a blast drying oven, heat it to 120°C for a hydrothermal reaction for 12 hours, and cool the resulting hydrothermal reaction system naturally After reaching room temperature, the obtained hydrothermal reaction product is vacuum-filtered on a sand core suction filter device (using a water-based fiber filter membrane with a pore size of 0.15 μm); the filtered solid material is placed in a blast drying oven and Dry at 80°C to obtain α-manganese dioxide, denoted as MnO 2 -120-12.

[0047] Carry out performance test and character...

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Abstract

The invention provides a preparation method of alpha-manganese dioxide. By the preparation method, regulation and control of the Mn<3+> content of the alpha-manganese dioxide can be achieved through change of the reaction temperature and the reaction time; moreover, a catalyst obtained after compounding the prepared alpha-manganese dioxide with nitrogen-doped conductive carbon powder has excellentoxygen reduction and oxygen evolution catalyzing performance; by the preparation method, doping of trivalent manganese ions and preparation of the alpha-manganese dioxide can be completed in one pot;in addition, a reaction condition is mild, the synthesis process is simple, and environment friendliness is achieved.

Description

technical field [0001] The invention relates to the technical field of manganese oxide preparation, in particular to α-manganese dioxide, a preparation method thereof and an electrocatalyst. Background technique [0002] Efficient oxygen reduction and oxygen evolution reaction (ORR / OER) electrocatalysts are required for the rapid development of clean and renewable energy conversion / storage technologies, including fuel cells and metal / air batteries. It is well known that the noble metal platinum and its alloys are considered to be the most efficient commercial ORR catalysts, while ruthenium oxide and iridium oxide are the most commonly used OER catalysts. However, their high cost and scarcity have become major obstacles to large-scale commercial applications. Therefore, there is an urgent need to develop efficient alternatives for ORR and OER. [0003] In recent years, various non-noble metal materials have been developed for ORR or OER, such as various carbon materials, po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02B01J23/34
CPCB01J23/34C01G45/02C01P2002/72C01P2002/85
Inventor 李福枝刘跃军石璞
Owner HUNAN UNIV OF TECH
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