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MOFs derived bimetallic cathode, preparation method thereof and method for improving yield and quality of methane by adopting MOFs derived bimetallic cathode

A bimetallic, cathode technology, applied in electrolytic organic production, chemical instruments and methods, electrodes, etc., can solve the problems of small improvement of methane production performance, high price and scarcity, unfavorable microbial adhesion, etc., to shorten the lag time and Stabilization time, good effect, effect of accelerated enrichment and electron transfer efficiency

Active Publication Date: 2022-03-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal Pt-based catalysts are still the preferred electrodes for MEC-AD systems due to their excellent hydrogen evolution catalytic activity, but their high price and scarcity limit their large-scale application.
Although the non-noble metal cathode has excellent conductivity and corrosion resistance, its smooth surface and low specific surface area are not conducive to the attachment of microorganisms, and have little effect on the improvement of the methane production performance of MEC-AD.

Method used

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  • MOFs derived bimetallic cathode, preparation method thereof and method for improving yield and quality of methane by adopting MOFs derived bimetallic cathode
  • MOFs derived bimetallic cathode, preparation method thereof and method for improving yield and quality of methane by adopting MOFs derived bimetallic cathode
  • MOFs derived bimetallic cathode, preparation method thereof and method for improving yield and quality of methane by adopting MOFs derived bimetallic cathode

Examples

Experimental program
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Embodiment 1

[0031] Such as figure 1 As shown, this implementation provides a MOFs-derived bimetallic cathode, comprising the following steps:

[0032] 1) Synthesis of ZIF-67: 5.5g 2-methylimidazole and 0.45g Co(NO 3 ) 2 ·6H 2 O was dissolved in 20 mL of deionized water to form solution A and solution B, respectively. Then, solution B was added dropwise to solution A under stirring condition. Stir continuously at room temperature for 6 hours, collect samples by centrifugation (8000 rpm, 15 minutes), wash with deionized water three times, and dry at 80°C for 12 hours to obtain ZIF-67;

[0033] 2) Synthesis of Co-NC nanotubes: put ZIF-67 obtained in step 1) into a quartz container, carbonize at 900°C for 2h under a nitrogen atmosphere, and heat up at a rate of 2°C / min to obtain Co-NC;

[0034] 3) Synthesis of Ni / Co-NC catalyst: ultrasonically disperse 80 mg of Co-NC obtained in step 2) into 100 mL of 4M HCl solution, stir for 12 hours, wash with ethanol several times, and dry at 80°C fo...

Embodiment 2

[0037] The method for improving the output and quality of methane by using the MOFs derived bimetallic cathode prepared by the preparation method provided in Example 1 comprises the following steps:

[0038] The operation of the microbial electrolysis cell: construct a single-chamber microbial electrolysis cell containing an anode and a MOFs-derived bimetallic cathode, and use the constructed single-chamber microbial electrolysis cell and anaerobic digestion system to couple the MEC-AD system. In the single-chamber microbial electrolysis cell The anode is a stable carbon brush for advance acclimatization The cathode is carbon felt modified by Ni / Co-N catalyst and carbon felt without Ni / Co-N modification, the Ag / AgCl electrode is used as a reference electrode, the effective working volume of the reactor is 160mL; an external 10Ω resistor is connected, and an external voltage of 0.6V is applied , inoculate anaerobic granular sludge with VS of 8.4g / L, 0.5g sodium acetate as carb...

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Abstract

The invention provides a preparation method of an MOFs (Metal-Organic Frameworks) derived bimetallic cathode and a method for improving the yield and quality of methane by using the MOFs derived bimetallic cathode. The preparation method comprises the following steps: synthesizing ZIF-67; synthesis of a Co-NC nanotube is carried out; synthesizing a Ni / Co-NC catalyst; and preparing the cathode. The Ni / Co-NC catalyst modified carbon felt is used as a cathode to promote the methane production of a microbial electrolysis cell coupled anaerobic digestion system, and the methane production rates are 1.5 times and 9.5 times of those of a catalyst-free modified electrode system and an AD system respectively. The self-prepared MOFs derived bimetallic material modified carbon felt is used as a cathode of an MEC-AD system obtained by coupling a single-chamber microbial electrolysis cell and an anaerobic digestion system, and the enrichment of hydrogen-consuming methanogens and the transfer of electrons from an electrode to the methanogens are promoted by using the excellent hydrogen evolution activity and electrochemical performance of the carbon felt; therefore, the purpose of improving the methane production efficiency and quality of the electrode is achieved.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide resource utilization, and in particular relates to a MOFs-derived bimetallic cathode, a preparation method thereof, and a method for improving methane output and quality by using the same. Background technique [0002] With the rapid development of society, energy consumption and carbon emissions have become the dilemmas people are facing. At present, the biogas produced by AD mainly contains 40-60% CH4 and 60-40% CO 2 , if the CO 2 If it is converted into methane, the leap from "zero carbon" to "negative carbon" can be realized. [0003] The coupling process of microbial electrolysis cell and anaerobic digestion system (MEC-AD) can efficiently convert CO 2 converted to CH 4 , which overcomes the transportation hazards, low gas-liquid mass transfer efficiency, and low solubility of the exogenous hydrogen supply purification technology, and is a research hotspot in the field of methane p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/052C25B11/065C25B3/26C25B3/03C02F3/00C02F3/28
CPCC25B11/091C25B11/052C25B11/065C25B3/26C25B3/03C02F3/005C02F3/28Y02E50/30
Inventor 谢丽郑小梅周文静
Owner TONGJI UNIV
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