N and S dual-doped carbon nanotube-coated FexC catalyst and preparation method and application thereof

A technology of carbon nanotubes and double doping, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of further simplification of the preparation process, high requirements for calcination conditions, unfavorable large-scale preparation, etc., and achieve low raw material prices , cheap raw materials, conducive to the effect of large-scale production

Inactive Publication Date: 2016-08-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst requires high calcination conditions in the preparation process, and the process is complicated, which is not conducive to large-scale preparation
[0006] In summary, the M-N-C catalyst has good catalytic performance for ORR, but the preparation process needs to be further simplified

Method used

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  • N and S dual-doped carbon nanotube-coated FexC catalyst and preparation method and application thereof
  • N and S dual-doped carbon nanotube-coated FexC catalyst and preparation method and application thereof
  • N and S dual-doped carbon nanotube-coated FexC catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Th-Fe-30-1-800°C-2h (Th: Thiourea, Fe: FeCl 3 ·6H 2 O, Th-Fe-30-1-800℃-2h refers to thiourea and FeCl in raw materials 3 ·6H 2 The molar ratio of O is 30:1, the calcination temperature is 800°C, and the calcination time is 2h)

[0041] 0.2367g of FeCl 3 ·6H 2 O was dissolved in 2mL deionized water to obtain solution A; then 2g of thiourea was weighed and dissolved in 80mL absolute ethanol to obtain solution B; solution A and solution B were mixed to obtain solution C and ultrasonically dispersed for 15min; the dispersed solution C was transferred to a petri dish, and dried in an air drying oven to obtain a catalyst precursor; the dried precursor was placed in a mortar, ground evenly, placed in a quartz boat, and calcined at 800°C for 2 hours under nitrogen protection; the calcined The resulting powder was transferred to a round bottom flask, 0.5molL -1 h 2 SO 4 Etching for 10 h; the sample obtained after etching was washed until the filtrate was neutr...

Embodiment 2

[0042] Example 2: Th-Fe-20-1-800°C-2h (Th: Thiourea, Fe: FeCl 3 ·6H 2 O, Th-Fe-20-1-800℃-2h refers to thiourea and FeCl in raw materials 3 ·6H 2 The molar ratio of O is 20:1, the calcination temperature is 800°C, and the calcination time is 2h)

[0043] 0.3551g of FeCl 3 ·6H 2 O was dissolved in 2mL deionized water to obtain solution A; then 2g of thiourea was weighed and dissolved in 80mL absolute ethanol to obtain solution B; solution A and solution B were mixed to obtain solution C and ultrasonically dispersed for 15min; the dispersed solution C was transferred to a petri dish, and dried in an air drying oven to obtain a catalyst precursor; the dried precursor was placed in a mortar, ground evenly, placed in a quartz boat, and calcined at 800°C for 2 hours under nitrogen protection; the calcined The resulting powder was transferred to a round bottom flask, 0.5molL -1 h 2 SO 4 Etching for 10 h; the sample obtained after etching was washed until the filtrate was neutr...

Embodiment 3

[0044] Example 3: Th-Fe-25-1-800°C-2h (Th: Thiourea, Fe: FeCl 3 ·6H 2 O, Th-Fe-25-1-800℃-2h refers to thiourea and FeCl in raw materials 3 ·6H 2 The molar ratio of O is 25:1, the calcination temperature is 800°C, and the calcination time is 2h)

[0045] 0.2841g of FeCl 3 ·6H 2 O was dissolved in 2mL deionized water to obtain solution A; then 2g of thiourea was weighed and dissolved in 80mL absolute ethanol to obtain solution B; solution A and solution B were mixed to obtain solution C and ultrasonically dispersed for 15min; the dispersed solution C was transferred to a petri dish, and dried in an air drying oven to obtain a catalyst precursor; the dried precursor was placed in a mortar, ground evenly, placed in a quartz boat, and calcined at 800°C for 2 hours under nitrogen protection; the calcined The resulting powder was transferred to a round bottom flask, 0.5molL -1 h 2 SO 4 Etching for 10 h; the sample obtained after etching was washed until the filtrate was neutr...

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Abstract

The invention provides a N and S dual-doped carbon nanotube-coated FexC catalyst and a preparation method, and belongs to the field of energy materials and electrochemistry. The N and S dual-doped carbon nanotube-coated FexC catalyst is prepared through pyrolysis in an inert atmosphere by taking thiourea as a C source, a N source and a S source, taking FeCl3.6H2O as a metal source and adopting a one-step method. According to the catalyst, metal particles are coated with N and S dual-doped carbon nanotubes, therefore, direction contact of the metal particles and an electrolyte solution in the reaction process can be effectively avoided, and the catalyst is beneficial for improving the material stability; the catalyst not only shows the oxygen reduction catalyzing performance equivalent to a Pt-C catalyst and the better stability and methanol tolerance under the alkaline condition, but also has the oxygen reduction catalyzing performance under the acidic condition; compared with a common coated-type FexC catalyst, the catalyst has the advantages that the preparation method is simple, the raw materials are easy to obtain, scale production is convenient to achieve, and the high practical value is achieved.

Description

technical field [0001] The invention belongs to the field of energy materials and electrochemistry, and more specifically relates to an electrocatalyst applied to fuel cell cathode oxygen reduction reaction and a preparation method. Background technique [0002] Due to the advantages of high energy conversion efficiency, environmental friendliness, high reliability and sustainable power generation, fuel cells have attracted widespread attention. However, the current commercial application of fuel cells still faces certain challenges, one of the most critical challenges is how to improve the slow kinetics of the cathode oxygen reduction reaction (Oxygenreduction reaction, ORR). At present, Pt-based catalysts are the catalysts with the best catalytic ORR performance, but the high price, poor stability and insufficient resistance to methanol of Pt greatly limit its commercial application. Therefore, the development of non-Pt catalysts with high catalytic activity, good stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88
CPCH01M4/8647H01M4/88H01M4/9041H01M4/9091Y02E60/50
Inventor 李光兰程光春张琳徐启明
Owner DALIAN UNIV OF TECH
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