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Enhancing method of oxygen mass transfer efficiency of microbial fuel cell cathode and corresponding cell

A fuel cell cathode, mass transfer efficiency technology, applied in biochemical fuel cells, fuel cells, fuel cell additives, etc., can solve the problem of low dissolved oxygen concentration, dissolved oxygen destroying anode anaerobic conditions, and insignificant improvement in power generation capacity, etc. to improve the reaction efficiency, improve the disturbance state, and reduce the impact

Inactive Publication Date: 2012-12-19
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The primary purpose of the present invention is that when the cathode of the existing dissolved oxygen aqueous solution microbial fuel cell is aerated, the aeration flow rate is too small, the dissolved oxygen concentration in the water is low, and the power generation capacity is not significantly improved; when the aeration flow rate is too large, the dissolved Diffusion of oxygen to the anode destroys the anaerobic conditions of the anode, and the power generation capacity is not significantly improved, providing a method to improve the oxygen mass transfer efficiency of the microbial fuel cell cathode

Method used

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  • Enhancing method of oxygen mass transfer efficiency of microbial fuel cell cathode and corresponding cell
  • Enhancing method of oxygen mass transfer efficiency of microbial fuel cell cathode and corresponding cell
  • Enhancing method of oxygen mass transfer efficiency of microbial fuel cell cathode and corresponding cell

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Embodiment 1

[0035] Such as figure 1 As shown, the microbial fuel cell given in this embodiment is composed of a cathode chamber 1 , an anode chamber 2 , a proton exchange membrane 3 , a cathode electrode 4 , an anode electrode 5 , a flow guiding mechanism 8 and an aeration mechanism 10 .

[0036]The cathode electrode 4 is in the form of a sheet, and the anode electrode 5 is in the shape of a column, which are suspended in the cathode chamber 1 and the anode chamber 2 respectively, and are respectively connected to the load through wires 6 . The proton exchange membrane 3 is located between the cathode chamber 1 and the anode chamber 2 through a fixed splint 7 and is parallel to the sheet cathode electrode 4 . The guide mechanism 8 is a straight guide tube in this embodiment, and is supported by a foot 9 extending from the bottom edge above the aeration mechanism 10 in the cathode chamber 1, and the volume surrounded by it accounts for 10% of the total volume of the cathode chamber 1. ~70...

Embodiment 2

[0038] Such as figure 2 As shown, the microbial fuel cell given in this embodiment is also composed of a cathode chamber 1 , an anode chamber 2 , a proton exchange membrane 3 , a cathode electrode 4 , an anode electrode 5 , a flow guiding mechanism 8 and an aeration mechanism 10 .

[0039] This embodiment is the same as the embodiment 1 except that the shape of the cathode electrode 4 is designed to be elastic, so the description is omitted here. The shape of the cathode electrode 4 is designed to be elastic. One is to make the air bubbles rising along the electrode wall have a flushing effect on the electrode, which can clean the combined water layer or biofilm attached to the electrode, which is conducive to the mass transfer of oxygen to the electrode surface; The second is to make the bubbles easily gather in the turbulent wake area formed on the upper end of the electrode, and increase the residence time of the protons here, which is beneficial to speed up the reaction s...

Embodiment 3

[0041] Such as figure 1 As shown, the microbial fuel cell given in this embodiment is also composed of a cathode chamber 1 , an anode chamber 2 , a proton exchange membrane 3 , a cathode electrode 4 , an anode electrode 5 , a flow guiding mechanism 8 and an aeration mechanism 10 . What is different from Embodiment 1 is that the guide tube of the guide mechanism 8 is a straight cylindrical shape with a trumpet-like lower port, see image 3 , the trumpet-shaped guide tube can change the water flow line, reduce the resistance during liquid circulation, increase the mass transfer rate of protons to the electrode, and make it easier to react with the oxidant and the electrons that are conducted to the cathode through an external circuit, thereby improving the cathode. reaction efficiency.

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Abstract

The invention discloses an enhancing method of oxygen mass transfer efficiency of a microbial fuel cell cathode, comprising the following steps: arranging a guiding mechanism in the cathode chamber of a fuel cell; arranging the cathode of the fuel cell in the guiding mechanism or reducing the size of the cathode chamber of the fuel cell to achieve the function of the guiding mechanism; and arranging an aeration mechanism below the guiding mechanism and feeding oxidant bubbles in bubble flow or slug flow into the guiding mechanism through the aeration mechanism. The invention also discloses a microbial fuel cell designed according to the method. Due to the guiding mechanism used in the cathode, the cathode aeration intensity is enhanced, the catholyte oxygen solubility is increased, and simultaneously the purposes of stirring the catholyte, increasing the catholyte circular flow and increasing the mass transfer rate of proton to the electrode are realized, thereby effectively enhancingthe cathode reaction efficiency, ensuring the anaerobic condition of an anode chamber and increasing the electricity generating ability of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of microbial fuel cells, and in particular relates to a method for improving the mass transfer efficiency of cathode oxygen of a microbial fuel cell and a microbial fuel cell designed according to the method to improve the mass transfer efficiency of cathode oxygen. The method and the designed corresponding microbial fuel cell can enhance catholyte fluid disturbance mass transfer, improve the dissolved oxygen concentration and mass transfer capacity of the cathode, and ultimately improve the power generation capacity of the microbial fuel cell. Background technique [0002] With the rapid development of industry and the sharp increase in energy consumption, the world's main energy source - petrochemical energy is not only facing the crisis of depletion, but also the environmental problems caused by its use are also increasing. Therefore, new efficient, clean and sustainable utilization Research and developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/16H01M8/04082H01M8/04089
CPCY02E60/527Y02E60/50
Inventor 刘百仓周先敏刘亚张永丽姚雪
Owner SICHUAN UNIV
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