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Nitrogen-sulfur double-doped carbon material difunctional oxygen catalyst and preparation method and application thereof

A technology of oxygen catalyst and carbon material, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., to achieve the effect of increasing specific surface area, low preparation cost and improving stability

Inactive Publication Date: 2016-12-07
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of nitrogen-sulfur double-doped carbon material (N-S-C) catalyst by this method, and the research on the application of this catalyst for alkaline electrolysis water anode OER and fuel cell cathode ORR have not been reported.

Method used

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  • Nitrogen-sulfur double-doped carbon material difunctional oxygen catalyst and preparation method and application thereof
  • Nitrogen-sulfur double-doped carbon material difunctional oxygen catalyst and preparation method and application thereof

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Embodiment 1

[0026] Weigh a certain mass of thiourea and sodium alginate to make the mass ratio 0.25:1, mix them evenly, and grind them thoroughly; then put them in a porcelain boat and place them in a quartz tube furnace, and heat them at 5°C under a nitrogen atmosphere. Heating at a rate of 1 / min, first raised to 200°C for 1 hour, then calcined at 600°C for 2 hours, and the obtained sample was ground again, and the obtained product was N-S-C with a specific surface area of ​​181.3m 2 / g.

Embodiment 2

[0028] Weigh a certain mass of thiourea and sodium alginate to make the mass ratio 0.50:1, mix them evenly, and grind them thoroughly; then put them in a porcelain boat and place them in a quartz tube furnace, and heat them at 5°C under a nitrogen atmosphere. Heating at a rate of 1 / min, first raised to 200°C for 1 hour, then calcined at 600°C for 2 hours, and the obtained sample was ground again, and the obtained product was N-S-C with a specific surface area of ​​157.8m 2 / g.

Embodiment 3

[0030] Weigh a certain mass of thiourea and sodium alginate to make the mass ratio 1.00:1, mix them evenly, and grind them thoroughly; then put them in a porcelain boat and place them in a quartz tube furnace, and heat them at 5°C under a nitrogen atmosphere. Heating at a rate of 1 / min, first raised to 200°C for 1 hour, then calcined at 600°C for 2 hours, and the obtained sample was ground again, and the obtained product was N-S-C with a specific surface area of ​​166.5m 2 / g.

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Abstract

The invention relates to a nitrogen-sulfur double-doped carbon material difunctional oxygen catalyst, a preparation method thereof and electrocatalysis application of alkaline medium in oxygen. In the catalyst, ocean polysaccharide sodium alginate is used as a carbon source, thiourea is sources of nitrogen and sulfur atoms, and double doping is performed on N and S which have electronegativity by high-temperature calcination in an inertia atmosphere to obtain a nitrogen-sulfur double-doped carbon material electrocatalyst. Since a double-doped crystal structure of heteroatoms is changed, the specific area and the catalyst site of the catalyst are improved, meanwhile, relatively high oxygen evolution (OER) and oxygen reduction (ORR) catalytic activity are achieved, and the overoptential of OER and ORR is effectively reduced; the ORR process is most divided to four electron catalytic mechanisms and is an relatively ideal ORR reaction process, and the catalyst has favorable stability and excellent methyl alcohol resistance; and the used raw material is low in cost, the preparation method is simple and is easy to operate, and mass production is facilitated.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a nitrogen-sulfur double-doped carbon-based material bifunctional oxygen catalyst with sodium alginate as a precursor; it also relates to a preparation method of the catalyst and its application in alkaline electrolysis Electrocatalytic applications in water anode oxygen evolution reaction and fuel cell cathode oxygen reduction reaction. Background technique: [0002] With the increasing demand for clean and sustainable energy, scientists have devoted a lot of energy to the research and development of efficient, low-cost and environmentally friendly energy conversion and storage systems. Among them, the oxygen reduction reaction (ORR) is a ubiquitous cathodic reaction in fuel cells and metal-air batteries, and the oxygen evolution reaction (OER) plays an important role in solar fuel synthesis and water splitting energy storag...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/90Y02E60/50
Inventor 詹天荣刘晓林康敬霞
Owner QINGDAO UNIV OF SCI & TECH
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