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A kind of n, s co-doped metal-free cns oxygen reduction catalyst and its preparation method

A catalyst and metal-free technology, applied in metal-air battery oxygen reduction reaction catalyst and fuel cell field, can solve problems such as environmental pollution and complicated preparation process, and achieve the effect of low cost, simple preparation process, and easy scale-up production

Active Publication Date: 2022-02-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These templates need to be etched with hydrofluoric acid or sodium hydroxide, which causes environmental pollution and complicated preparation process

Method used

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  • A kind of n, s co-doped metal-free cns oxygen reduction catalyst and its preparation method
  • A kind of n, s co-doped metal-free cns oxygen reduction catalyst and its preparation method
  • A kind of n, s co-doped metal-free cns oxygen reduction catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: CN 1 S 0.2 -900-2(CN 1 S 0.2 1 in -900-2 means g-C in the raw material 3 N 4 The mass is 1g, 0.2 means the mass ratio of sulfur powder to sodium sulfide is 0.2, 900 means the calcination temperature is 900°C, 2 means the calcination time is 2h)

[0035] 1gg-C 3 N 4 Add to 40mL deionized water, then add 64mg sulfur powder, 280mg sodium sulfide and 200mg glucose, stir for 30min to form a uniform mixed solution A. The mixed solution A was charged into an autoclave, and reacted at 180° C. for 10 h. Then cool to room temperature naturally. Suction filtration, washing, drying in an air oven for 10 hours at 80°C, and then grinding to obtain the CNS catalyst precursor g-C 3 N 4 / CS.

[0036] will g-C 3 N 4 / CS precursor was put into the tube furnace, under N 2 It was calcined under atmosphere for 2 hours, the calcining temperature was 900°C, and the heating rate was 10°C / min. Finally got CN 1 S 0.2 -900-2 Catalyst.

Embodiment 2

[0037] Example 2: CN 2 S 0.2 -900-2(CN 2 S 0.2 2 in -900-2 means g-C in the raw material 3 N 4 The mass is 2g, 0.2 means the mass ratio of sulfur powder to sodium sulfide is 0.2, 900 means the calcination temperature is 900°C, 2 means the calcination time is 2h)

[0038] 2gg-C 3 N 4 Add to 40mL deionized water, then add 64mg sulfur powder, 280mg sodium sulfide and 200mg glucose, stir for 30min to form a uniform mixed solution A. The mixed solution A was charged into an autoclave, and reacted at 180° C. for 10 h. Then cool to room temperature naturally. Suction filtration, washing, drying in an air oven for 10 hours at 80°C, and then grinding to obtain the CNS catalyst precursor g-C 3 N 4 / CS.

[0039] will g-C 3 N 4 / CS precursor was put into the tube furnace, under N 2 It was calcined under atmosphere for 2 hours, the calcining temperature was 900°C, and the heating rate was 10°C / min. Finally got CN 2 S 0.2 -900-2 Catalyst.

Embodiment 3

[0040] Example 3: CN 3 S 0.2 -900-2(CN 3 S 0.2 3 in -900-2 means g-C in the raw material 3 N 4 The mass is 3g, 0.2 means the mass ratio of sulfur powder to sodium sulfide is 0.2, 900 means the calcination temperature is 900°C, 2 means the calcination time is 2h)

[0041] 3gg-C 3 N 4 Add to 40mL deionized water, then add 64mg sulfur powder, 280mg sodium sulfide and 200mg glucose, stir for 30min to form a uniform mixed solution A. The mixed solution A was charged into an autoclave, and reacted at 180° C. for 10 h. Then cool to room temperature naturally. Suction filtration, washing, drying in an air oven for 10 hours at 80°C, and then grinding to obtain the CNS catalyst precursor g-C 3 N 4 / CS.

[0042] will g-C 3 N 4 / CS precursor was put into the tube furnace, under N 2 It was calcined under atmosphere for 2 hours, the calcining temperature was 900°C, and the heating rate was 10°C / min. Finally got CN 3 S 0.2 -900-2 Catalyst.

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Abstract

An N, S co-doped metal-free CNS oxygen reduction catalyst and a preparation method thereof belong to the technical field of energy materials and electrochemistry. The present invention uses glucose as carbon source, with g-C 3 N 4 As nitrogen source and soft template agent, polysulfide as sulfur source, three-dimensional porous carbon material catalyst was synthesized by hydrothermal-calcination two-step method. The obtained CNS catalyst is a three-dimensional porous graphene-like structure, and the surface contains a large number of pore structures. The ORR of the catalyst has an initial potential of 1.01V and a half-wave potential of 0.88V in an alkaline electrolyte, which is higher than that of a commercial Pt / C catalyst. Good catalytic performance. The invention has a large number of channels, which can expose more active sites, which is conducive to the transmission of ORR reaction substances and the improvement of the ORR catalytic activity of the material; the selected reagent has low toxicity, wide source of raw materials, low cost, and the preparation process is simple and convenient. Green and pollution-free, easy to scale up production, and conducive to large-scale application; it can be used in acidic and alkaline primary and secondary batteries involving ORR, such as fuel cells and metal-air batteries.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and relates to a fuel cell and a metal-air battery oxygen reduction reaction catalyst. Specifically involving a glucose as carbon source, g-C 3 N 4 As N source, polysulfide as sulfur source, N, S co-doped metal-free CNS oxygen reduction catalyst and preparation method are synthesized by hydrothermal-calcination two-step method. Background technique [0002] With the rapid development of society, problems such as energy crisis and environmental pollution are becoming more and more serious. Therefore, there is an urgent need to find new energy and conversion technologies for green and sustainable development. Fuel cells and metal-air batteries have the advantages of no pollution, high theoretical energy density and no noise, and are currently research hotspots. However, the development of fuel cells, metal-air batteries, etc. still faces a common challenge: the slo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M4/583H01M12/06H01M12/08B82Y30/00B82Y40/00
CPCH01M4/96H01M4/583H01M12/06H01M12/08B82Y30/00B82Y40/00Y02E60/10
Inventor 李光兰曹硕徐晓存路中发王新
Owner DALIAN UNIV OF TECH
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