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Preparation method of ordered mesopore cathode composite of MEC

A cathode composite material and mesoporous technology, applied in chemical instruments and methods, electrodes, electrode shapes/types, etc., can solve the problems of expensive cathode catalysts, environmental pollution, etc., and achieve faster electron transfer, reduced dependence, and easy operation Effect

Inactive Publication Date: 2018-02-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of high cost and environmental pollution of existing cathode catalysts, the present invention provides a method for preparing an ordered mesoporous cathode composite material of MEC

Method used

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  • Preparation method of ordered mesopore cathode composite of MEC
  • Preparation method of ordered mesopore cathode composite of MEC
  • Preparation method of ordered mesopore cathode composite of MEC

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preparation example Construction

[0038] ⑵ Preparation of nickel cobalt oxide / SBA-15

[0039] Using mesoporous molecular sieve SBA-15 as a hard template, the nickel-cobalt precursor is introduced into the pores of the hard template SBA-15 by impregnation, dried overnight, and then calcined to obtain a catalyst;

[0040] (3) Removal of silicon template

[0041] The catalyst prepared above is placed in NaOH solution or HF solution and stirred to remove the hard template SBA-15 to obtain the catalyst nickel cobalt oxide;

[0042] ⑷ Electrode preparation

[0043] The catalyst nickel cobalt oxide was placed in absolute ethanol, ultrasonicated, and then fixed on both sides of the carbon paper with a binder, and dried at room temperature to prepare the MEC cathode electrode.

[0044] Preferably, the molar percentage of the template agent P123 in the silicon source in step (1) is 0.01-0.03, 0.01, 0.02, 0.03 are optional; the HCl solution is controlled at 1.5-2.5, 1.5, 2.0, 2.5 are optional; the heating and stirring ...

Embodiment 1

[0060] At a water bath temperature of 39°C, 5g of P123 (0.02 mole percent of tetraethyl orthosilicate) was dissolved in 200mL of hydrochloric acid solution at pH=2.0, and after 4 hours, 11mL of tetraethyl orthosilicate was added dropwise and stirred for 20h. Filter, transfer to a reaction kettle, stand at 100°C for 48 hours, filter with suction, dry at 60°C, and bake at 550°C for 5 hours to obtain a white mesoporous hard template SBA-15.

Embodiment 2

[0062] Take a certain amount of nickel-cobalt nitrate (nickel-cobalt mol ratio is 1:2) and be dissolved in dehydrated ethanol solution, add the dried SBA-15 1g of embodiment 1, make it just meet equal-volume impregnation condition (solid-liquid The volume ratio is 1:1), evaporated to dryness under stirring. The obtained samples were dried overnight in an oven at 60 °C, and then calcined at 550 °C for 5 h in a tube furnace under a nitrogen atmosphere. Then, place in 2mol / L NaOH solution at 50°C and stir for 24h to remove the template, then filter and wash with absolute ethanol and distilled water until neutral. Finally, it is dried in an oven at 60°C to obtain the catalyst nickel-cobalt oxide.

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Abstract

The invention relates to the field of microorganism electrolytic tank cathode materials, in particular to a preparation method of an ordered mesopore cathode composite of MEC. P123 is adopted as a template agent, tetraethoxysilane (TEOS) is adopted as a silicone source, and a mesoporous molecular sieve SBA-15 is obtained through synthesis. Mesoporous silica SBA-15 is adopted as a hard template, the hard template is filled with a precursor nickel source and a cobalt source different in molar ratio through the nanometer casting technology, after roasting at different temperatures, a catalyst isput in alkali liquor to be stirred to remove the template, and metal oxide with an ordered mesopore structure is prepared. The preparation method is simple, operation is easy, cost is low, dependencyon precious metal Pt is greatly reduced, and wide application prospects are achieved in the field such as microorganism electrolytic tank waste water treatment. The mesopore metal oxide NiCo2O4 is adopted as a cathode catalyst of the MEC, the specific surface area of an electrode is increased, an ordered mesopore channel is formed, the chemocatalysis function can be achieved synchronously, and electron transfer can be accelerated.

Description

technical field [0001] The invention relates to the field of cathode materials for microbial electrolytic cells, in particular to a method for preparing an ordered mesoporous cathode composite material of MEC. Background technique [0002] Today's society urgently needs the effective disposal of various wastes and the effective development of new clean energy. Hydrogen is a clean, efficient and renewable energy source. However, the traditional hydrogen production technology needs to consume a large amount of fossil fuels or electricity, and the production cost is relatively high. Microbial electrolysis cells are developed on the basis of microbial fuel cells, using microorganisms as catalysts to release hydrogen while treating wastewater. The device can not only realize water pollution control, but also "turn waste into treasure", and its actual production application will bring greater economic benefits. Its basic working principle is that under the action of external vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B1/04C25B11/06C02F1/46
CPCC02F1/46109C02F2001/46133C02F2001/46157C25B1/04C25B11/031C25B11/077Y02E60/36
Inventor 安霞王文贞吴旭谢鲜梅
Owner TAIYUAN UNIV OF TECH
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