Non-crystal type manganese oxide loaded nitrogen-doped carbon-based (MnOx/NC) catalyst, and preparation method thereof

A manganese oxide, nitrogen-doped carbon technology, used in electrochemical generators, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of decreased catalytic performance, poor electrical conductivity, easy aggregation, etc. , conducive to dispersion, the effect of large surface area

Inactive Publication Date: 2017-09-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Manganese oxides have attracted extensive attention from researchers due to their low cost, good chemical stability, high catalytic efficiency, environmental friendliness, and many types of oxides. The main problem currently facing manganese oxides as ORR / OER catalysts is MnO x Poor conductivity and easy aggregation, these problems lead to MnO x Decreased catalytic performance

Method used

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  • Non-crystal type manganese oxide loaded nitrogen-doped carbon-based (MnOx/NC) catalyst, and preparation method thereof
  • Non-crystal type manganese oxide loaded nitrogen-doped carbon-based (MnOx/NC) catalyst, and preparation method thereof
  • Non-crystal type manganese oxide loaded nitrogen-doped carbon-based (MnOx/NC) catalyst, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: MnO x / NC-15wt.%-900℃(MnO x / NC means that the prepared material is Ketjen carbon supported by nitrogen-doped amorphous manganese oxide, 15wt.% means that the mass of potassium permanganate charged accounts for 15% of the total mass of all raw materials, and 900°C means that the calcination temperature is 900°C)

[0034] Weigh 0.5g NH 4 Cl with 97.5mg KMnO 4 Put it in a mortar, mix the two evenly and grind them thoroughly for 10 minutes. Finally, add 50mg Ketjen carbon, mix well and set aside.

[0035] The mixture of the above three raw materials was placed in a ball mill jar and ground at a speed of 500 rpm for 1 h. Then put the above material in N 2 At 3°C ​​min under atmosphere -1 The temperature was raised to 900°C, and kept at this temperature for 2 hours, and weighed after natural cooling, the obtained product was MnO x / NC catalyst.

Embodiment 2

[0036] Example 2: MnO x / NC-10wt.%-900℃(MnO x / NC means that the prepared material is Ketjen Carbon loaded with nitrogen and doped with amorphous manganese oxide, 10wt.% means that the mass of potassium permanganate is 10% of the total mass of all raw materials, and 900°C means that the calcination temperature is 900°C )

[0037] Weigh 0.5g NH 4 Cl with 62mg KMnO 4 Put it in a mortar, mix the two evenly and grind them thoroughly for 10 minutes. Finally, add 50mg Ketjen carbon, mix well and set aside.

[0038] The mixture of the above three raw materials was placed in a ball mill jar and ground at a speed of 500 rpm for 1 h. Then put the above material in N 2 At 3°C ​​min under atmosphere -1 The temperature was raised to 900°C, and kept at this temperature for 2 hours, and weighed after natural cooling, the obtained product was MnO x / NC catalyst.

Embodiment 3

[0039] Example 3: MnO x / NC-5wt.%-900℃(MnO x / NC means that the prepared material is Ketjen Carbon loaded with nitrogen and doped with amorphous manganese oxide, 5wt.% means that the mass of potassium permanganate is 5% of the total mass of all raw materials, and 900°C means that the calcination temperature is 900°C )

[0040] Weigh 0.5g NH 4 Cl with 29mg KMnO 4 Put it in a mortar, mix the two evenly and grind them thoroughly for 10 minutes. Finally, add 50mg Ketjen carbon, mix well and set aside.

[0041] The mixture of the above three raw materials was placed in a ball mill jar and ground at a speed of 500 rpm for 1 h. Then put the above material in N 2 At 3°C ​​min under atmosphere -1 The temperature was raised to 900°C, and kept at this temperature for 2 hours, and weighed after natural cooling, the obtained product was MnO x / NC catalyst.

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Abstract

The invention belongs to the fields of energy materials and electrochemistry, and provides a non-crystal type manganese oxide loaded nitrogen-doped carbon-based (MnOx / NC) catalyst, and a preparation method thereof. The method comprises the following steps: an MnOx precursor and a nitrogen source are evenly mixed at a mass ratio of 1 to 1-50 and grinded to obtain a mixture; a carbon source and the mixture are evenly mixed at a mass ratio of 1 to 1-50 and grinded to obtain a composite material; and under the protection of an inert gas, the composite material is heated up to 400-1,500 DEG C for 0.1-100h of heat treatment, and is then cooled down to the room temperature to obtain the MnOx / NC catalyst. The MnOx / NC catalyst and the preparation method provided by the invention have the advantages that a preparation process is simple; an adopted Mn source can be acquired from a wide range of sources and is low in cost, and prepared MnOx is non-toxic, so that scale production is facilitated; and the prepared catalyst can catalyze oxygen electrode reactions.

Description

technical field [0001] The invention belongs to the field of energy materials and electrochemistry, and relates to a preparation method applied to fuel cell oxygen electrode catalysts, in particular to a kind of MnO x / NC electrocatalyst and its preparation method. Background technique [0002] Fuel cells have attracted extensive attention of researchers due to their high energy conversion efficiency, environmental friendliness, abundant and easy-to-obtain fuels, and not being limited by the Carnot cycle. However, the oxygen reduction reaction (Oxygen reduction reaction, ORR) or oxygen evolution reaction (oxygen evolution reaction, OER) kinetics of the cathode oxygen electrode is slow, so the preparation of efficient cathode ORR / OER catalysts has become a major challenge for current fuel cell applications. The best catalysts for ORR / OER are Pt-based catalysts and RuO 2 , but the precious metal reserves are small, expensive, poor stability and insufficient resistance to met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M8/1011
CPCH01M4/9016H01M4/9083H01M8/1011Y02E60/50Y02P70/50
Inventor 李光兰杨贝贝王赫袁丽芳陈文雯李佳轶田贺元李奇蓬郝策
Owner DALIAN UNIV OF TECH
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