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Phosphorus-doped porous carbon-coated cobalt tetroxide oxygen reduction catalyst and preparation method and application thereof

A carbon-coated tricobalt oxide and catalyst technology, which is applied to structural parts, electrical components, battery electrodes, etc., to achieve the effects of low price, good methanol tolerance, and low production cost

Active Publication Date: 2018-12-21
湖南麓邵技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some achievements have been made in the preparation of porous carbon nanomaterials using MOF as a precursor, there is no P-doped cobalt carbon porous material prepared using Zif-67 as a template and precursor and sodium phytate as a phosphorus source. Nanocomposite (Co 3 o 4 / PPC) and study its ORR electrocatalytic performance

Method used

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  • Phosphorus-doped porous carbon-coated cobalt tetroxide oxygen reduction catalyst and preparation method and application thereof
  • Phosphorus-doped porous carbon-coated cobalt tetroxide oxygen reduction catalyst and preparation method and application thereof
  • Phosphorus-doped porous carbon-coated cobalt tetroxide oxygen reduction catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (a) Preparation of ZIF-67

[0031] Take 450mg of Co(NO 3 ) 2 ·6H 2 O was dissolved in 4 mL of deionized water, which was called solution A; 5.5 g of 2-methylimidazole was weighed and dissolved in 20 mL of deionized water, which was called solution B. Under the condition of stirring at room temperature, solution B was dropped into solution A at a constant speed at a constant speed, and the reaction mixture was reacted in a 40°C water bath for 24 hours, then aged at room temperature for 24 hours, centrifuged at 4000rpm for 8 minutes, washed several times with deionized water and ethanol, 60 After vacuum drying at ℃ for 12 hours, the purple crystal ZIF-67 was obtained;

[0032] (b) Preparation of sodium phytate / ZIF-67 complex

[0033] Weigh 2g of ZIF-67 and disperse it in 30mL deionized water, and record it as dispersion C; weigh 2g of sodium phytate and dissolve it in 30mL deionized water, and record it as solution D; Into the dispersion C, react in a water bath at 6...

Embodiment 2

[0037] (a) Preparation of ZIF-67

[0038] Prepare according to the method and conditions of step (a) in Example 1.

[0039] (b) Preparation of sodium phytate / ZIF-67 complex

[0040] Weigh 2g of ZIF-67 and disperse it in 30mL deionized water, and record it as dispersion C; weigh 4g of sodium phytate and dissolve it in 30mL deionized water, and record it as solution D; Into the dispersion C, react in a water bath at 60°C for 8h, centrifuge at 4000rpm for 8min, wash with deionized water and ethanol several times, and dry in vacuum at 60°C for 12h to prepare the sodium phytate / ZIF-67 complex;

[0041] (c)Co 3 o 4 / PPC Catalyst Preparation

[0042] Grind the sodium phytate / ZIF-67 compound obtained in step (b) into powder, take a certain amount and put it in a porcelain boat, place the porcelain boat in a tube furnace, and liter High temperature to 250 ° C, after constant temperature treatment for 2 hours, the temperature was raised to 700 ° C for 4 hours at the same heating ra...

Embodiment 3

[0044] (a) Preparation of ZIF-67

[0045] Prepare according to the method and conditions of step (a) in Example 1.

[0046] (b) Preparation of sodium phytate / ZIF-67 complex

[0047] Weigh 2g of ZIF-67 and dissolve it in 30mL deionized water, and record it as solution C; weigh 6g of sodium phytate and dissolve it in 30mL deionized water, record it as solution D; under stirring at room temperature, slowly add solution D dropwise to In solution C, react in a water bath at 60°C for 8h, centrifuge at 4000rpm for 8min, wash with deionized water and ethanol several times, and dry in vacuum at 60°C for 12h to prepare the sodium phytate / ZIF-67 complex;

[0048] (c)Co 3 o 4 / PPC Catalyst Preparation

[0049] Grind the sodium phytate / ZIF-67 compound obtained in step (b) into powder, take a certain amount and put it in a porcelain boat, place the porcelain boat in a tube furnace, and liter High temperature to 250 ° C, after constant temperature treatment for 2 hours, the temperature ...

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Abstract

A phosphorus doped porous carbon coated cobalt tetroxide oxygen reduction catalyst, a preparation method and application thereof are provided. The invention adopts ZIF-67 as a template and precursors,uses phytic acid sodium as phosphorus source, A phosphorus doped porous carbon coated cobalt tetroxide oxygen reduction catalyst is prepared at high temperature calcination in an inert atmosphere, calcined carbon inherits the porous structure of ZIF, while the metal is oxidized to cobalt tetroxide, and uniformly supported on phosphorus-doped carbon materials, the oxygen reduction catalyst has high conductivity and specific surface area, which effectively reduces the overpotential of oxygen reduction. The rotating disk electrode and rotating ring disk electrode show that the oxygen reduction reaction is an ideal 4-electron mechanism, and has good stability and methanol tolerance. The electrocatalyst exerts the synergistic effect of cobalt tetroxide and phosphorus doped carbon materials inoxygen reduction catalysis and has potential application value in energy conversion and storage.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a phosphorous-doped porous carbon-coated cobalt tetroxide oxygen reduction catalyst; it also relates to a preparation method of the catalyst and its electrocatalytic application in 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 common cathode reaction in fuel cells and metal-air batteries. Considering the activity and stability of the catalyst, the catalysts used for the ORR reaction mainly include Pt and its alloys, but these noble metals are found in nature. Very rare and expensive, the promotion of fuel cells has been gr...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8825H01M4/9016H01M4/9083Y02E60/50
Inventor 詹天荣祁洪运康敬霞张晓
Owner 湖南麓邵技术服务有限公司
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