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Three-dimensional honeycomb graphene-like non-metallic catalyst, preparation method and application

A non-metallic catalyst and honeycomb technology, applied in the field of materials, can solve the problems of low activity and stability, high cost of cathode oxygen reduction catalyst, etc., and achieve high methanol poisoning resistance, aerobic reduction performance, and large specific surface area.

Active Publication Date: 2020-04-14
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a three-dimensional honeycomb graphene-like non-metallic catalyst and its preparation method and application, aiming at solving the problems of high cost, low activity and stability of existing cathode oxygen reduction catalysts. question

Method used

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  • Three-dimensional honeycomb graphene-like non-metallic catalyst, preparation method and application
  • Three-dimensional honeycomb graphene-like non-metallic catalyst, preparation method and application
  • Three-dimensional honeycomb graphene-like non-metallic catalyst, preparation method and application

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Effect test

Embodiment 1

[0031] Weigh 1 g of bean dregs, add 4 g KCl, 4 g NaCl, 0.6 g NaNO in sequence 3 , fully mixed; then placed in a tube furnace, nitrogen protection, carbonization treatment at 900 ° C; finally with H 2 O wash to neutral, dry; re-wash with 2 M HNO 3 After soaking for 20 hours, the detergent was neutralized, and then dried to obtain a three-dimensional honeycomb graphene-like non-metallic catalyst.

[0032] The structure and performance of the three-dimensional honeycomb graphene-like metalloid catalyst prepared in this example are analyzed and described below.

[0033] 1. SEM analysis

[0034] figure 1 Scanning electron microscope (SEM) image of the three-dimensional honeycomb graphene-like metalloid catalyst prepared for this example. From figure 1 It can be seen from the figure that the catalyst has a three-dimensional honeycomb graphene-like structure, and the three-dimensional honeycomb structure is conducive to the transport of electrons; the graphene-like structure exp...

Embodiment 2

[0042] Weigh 1 g of bean dregs, add 6 g KCl, 4 g NaCl, 0.4 g NaNO in sequence 3 , fully mixed; then placed in a tube furnace, nitrogen protection, carbonization treatment at 900 ° C; finally with H 2 O wash to neutral, dry; re-wash with 2 M HNO 3 After soaking for 24 hours, the detergent was neutralized, and then dried to obtain a three-dimensional honeycomb graphene-like non-metallic catalyst.

[0043] at 0.1 mol L -1 The ORR was tested in KOH solution, and it was found that the onset potential of the metal-free catalyst was 2 mV lower than that of the commercial 20% Pt / C catalyst, and the half-wave potential was 20 mV lower.

Embodiment 3

[0045] Weigh 1 g of bean dregs, add 4 g LiCl, 6 g NaCl, 0.5 g NaNO in sequence 3 , fully mixed; then placed in a tube furnace, nitrogen protection, carbonization treatment at 900 ° C; finally with H 2 O wash to neutral, dry; re-wash with 2 M HNO 3 After soaking for 24 hours, the detergent was neutralized, and then dried to obtain a three-dimensional honeycomb graphene-like non-metallic catalyst.

[0046] at 0.1 mol L -1 ORR was tested in a KOH solution, and it was found that the onset potential of the metal-free catalyst was 1 mV lower than that of the commercial 20% Pt / C catalyst, and the half-wave potential was 10 mV lower.

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Abstract

The invention discloses three-dimensional cellular graphene-like non-metal catalyst and a preparation method and application thereof. The preparation method comprises the steps of fully mixing bean dregs, sodium nitrate, first chlorine salt and second chlorine salt; then performing carbonization treatment under inert gas protection; finally washing to a neutral state through H2O and drying; then soaking in acid for 12 to 24h, washing to a neutral state and drying again to obtain the three-dimensional cellular graphene-like non-metal catalyst. The three-dimensional cellular graphene-like non-metal catalyst prepared by the method has high activity, large specific surface area and large total hole volume, shows good oxygen reduction performance and higher resistance to methanol poisoning in alkaline solution, and accordingly can be used as cathode oxygen reduction catalyst of a fuel cell.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a three-dimensional honeycomb graphene-like non-metallic catalyst, a preparation method and an application. Background technique [0002] A fuel cell is a system that will store in fuel (natural gas, H 2 , methanol, etc.) and oxidizing agents (O 2 , air) in the chemical energy directly into electrical energy generation device. Fuel cells have the advantages of high power generation efficiency and less environmental pollution, and have become an ideal power generation technology. However, the key factor restricting the development and application of fuel cells is the catalyst for the cathode oxygen reduction reaction. At present, the cathode oxygen reduction catalyst of direct methanol fuel cells mainly adopts Pt / C catalyst, but the high price of Pt and the lack of resources lead to the high cost of direct methanol fuel cells. In addition, methanol permeates into the cathode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/96
CPCH01M4/9091H01M4/96Y02E60/50
Inventor 吕维忠陈伊麦王荣方季山
Owner SHENZHEN UNIV
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