Carbon tubular oxygen reduction cathode microbial fuel cell and preparation method thereof

A technology of fuel cells and microorganisms, applied in biochemical fuel cells, battery electrodes, circuits, etc., can solve the problems of secondary pollution costs of chemical cathodes, high cost of metal cathode catalysts, unsuitable for large-scale practical application, etc., and achieve good application prospects, Low cost, the effect of reducing production and processing costs

Active Publication Date: 2016-03-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Because the chemical cathode will cause secondary pollution and is expensive, it is not suitable for large-scale practical application
At present, extensive research is mainly focused on air cathodes, but the above-mentioned commonly used cathode materials generally have the disadvantages of poor mechanical properties and complicated manufacturing processes, and the cost of metal cathode catalysts is high, which may also cause heavy metal pollution.
Therefore, carbonaceous catalysts with low price and good performance have good practical application prospects, but the current carbonaceous cathode catalyst and cathode structure still need further research and improvement

Method used

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  • Carbon tubular oxygen reduction cathode microbial fuel cell and preparation method thereof
  • Carbon tubular oxygen reduction cathode microbial fuel cell and preparation method thereof
  • Carbon tubular oxygen reduction cathode microbial fuel cell and preparation method thereof

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Embodiment 1

[0024] Embodiment 1: The preparation method of carbonaceous tubular oxygen reduction cathode microbial fuel cell, comprising the following steps:

[0025] A. Carbonization of cathode material: Place the prepared fresh bamboo tube in an oven and bake it at 80°C for 7 days to ensure that the bamboo tube has been completely dehydrated; then place the dried bamboo charcoal in a high-temperature atmosphere furnace and vacuumize , After filling with nitrogen, heat up to 900°C at a heating rate of 1-3°C / min. 3 / min carbonization for 2 hours, lower the furnace temperature to below 100°C and take out the bamboo tube; then place the bamboo tube in the air environment, and carry out heat treatment in a 350°C oven for 2 hours, and then heat-treated the inner surface of the bamboo tube Polish the outer surface to obtain a bamboo charcoal tube with a wall thickness of about 2 to 3 mm and a certain length.

[0026] B. Preparation of cathode: After cleaning and drying the bamboo charcoal tub...

Embodiment 2

[0029] A carbonaceous tubular oxygen reduction cathode microbial fuel cell preparation method, comprising the following steps:

[0030] A. Carbonization of cathode materials: Fresh bamboo tubes were used as precursors. Place the prepared fresh bamboo tubes in an oven with an inner diameter of 5 cm and a length of 12 cm, and bake them at 40°C for 2 days and at 80°C for 3 days to ensure that the bamboo tubes are completely dehydrated. Place the dried bamboo charcoal in a high-temperature atmosphere furnace, vacuumize, fill with nitrogen, and then heat it to 1000°C at a rate of 1.5°C / min. Under nitrogen atmosphere, the nitrogen flow rate is 250cm 3 / min carbonization for 2.5 hours, take out the bamboo tube when the furnace temperature drops below 100°C; arrange the carbonized bamboo tube under a scanning electron microscope to observe its microscopic characteristics, and find that the carbonized bamboo charcoal can maintain rich porosity, which is a material Transmission provides...

Embodiment 3

[0034] Example 3: A method for preparing a carbonaceous tubular oxygen reduction cathode microbial fuel cell. The difference between this method and Example 2 is that the separation membrane is a polytetrafluoroethylene membrane. After the battery is prepared and assembled in this way, the waste water of 200COD, 500COD, 1000COD and 1500COD are treated respectively, and the COD removal efficiency and Coulombic efficiency are as follows: Figure 4 shown. In the case of COD, this carbon tubular oxygen reduction cathode microbial fuel cell can achieve a high COD removal rate and has a good wastewater treatment capacity.

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Abstract

The invention discloses a carbon tubular oxygen reduction cathode microbial fuel cell and a preparation method thereof. The carbon tubular oxygen reduction cathode microbial fuel cell comprises an anode and a cathode and is characterized in that the cathode adopts a bamboo charcoal tube, wherein the outer surface of the bamboo charcoal tube is coated with polytetrafluoroethylene emulsion with the concentration of 5-10% and a partition membrane with pore size less than 1 m um is mounted on the inner surface of the bamboo charcoal tube; the outer side of the cathode is wound with a titanium wire, the anode is inserted in the bamboo charcoal tube along the axial direction of the bamboo charcoal tube, and the anode adopts carbon cloth, a carbon brush, carbon paper, carbon felt, a carbon rod or graphite flake; an end plate is arranged at each of the two ends of the cathode and the end plates are fixed with bolts; an electrolyte inlet is formed in one of the end plates and an electrolyte outlet is formed in the other end plate. Since a natural and cheap porous material is used as a precursor and a structural material, the fuel cell is low in cost and has good application prospect.

Description

technical field [0001] The invention relates to a microbial fuel cell, in particular to a carbonaceous tubular oxygen reduction cathode microbial fuel cell and a preparation method. Background technique [0002] Microbial Fuel Cells (MFCs) is a device that uses microorganisms to directly convert chemical energy in organic matter into electrical energy. It has a wide range of fuel sources, mild reaction conditions, good biocompatibility, and unique waste water treatment while generating electrical energy. It has become a hot spot for global renewable energy researchers. However, although the performance of microbial fuel cells has been greatly improved in the past few decades, low power density and high cost are still two bottlenecks that limit the practical application of microbial fuel cells. As an important component of microbial fuel cells, the performance characteristics of the cathode are closely related to the reduction rate of the electron acceptor; therefore, the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/16H01M4/86H01M4/88
CPCH01M4/8605H01M4/8817H01M8/16Y02E60/50
Inventor 李俊杨伟付乾张亮叶丁丁朱恂廖强
Owner CHONGQING UNIV
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