Graphite-polytetrafluoroethylene three-dimensional particle cathode of MFC (microbial fuel cell) synthesized on basis of hydrogen peroxide and preparation method

A polytetrafluoroethylene and graphite technology, used in battery electrodes, biochemical fuel cells, electrical components, etc., can solve problems such as low hydrogen peroxide yield, improve mass transfer coefficient and energy output, increase production, and high conductivity. rate effect

Inactive Publication Date: 2014-08-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogen peroxide yield of the MFC...

Method used

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  • Graphite-polytetrafluoroethylene three-dimensional particle cathode of MFC (microbial fuel cell) synthesized on basis of hydrogen peroxide and preparation method
  • Graphite-polytetrafluoroethylene three-dimensional particle cathode of MFC (microbial fuel cell) synthesized on basis of hydrogen peroxide and preparation method

Examples

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Effect test

Embodiment 1

[0020] (1) Soak graphite powder (with a particle size of about 20-40 μm) in deionized water, and clean it ultrasonically for 30 minutes at 30°C; then put the graphite powder in an oven at 80°C for drying; dry the dried graphite powder Place in a container, add ethanol to immerse it, and stir for 60 minutes in a water bath at 60°C to disperse the graphite powder in ethanol to form a graphite ethanol dispersion system;

[0021] (2) Under the condition of 60°C water bath and stirring, according to the proportion of 75 μL polytetrafluoroethylene (PTFE, 60wt%) suspension per gram of graphite powder, add the PTFE suspension dropwise to the graphite ethanol dispersion system; in a water bath at 60°C, continue to stir until an elastic graphite-PTFE mixture is formed;

[0022] (3) graphite-polytetrafluoroethylene mixture is prepared the graphite-polytetrafluoroethylene particle that particle diameter is 2-3mm by extruding-spheronization method; Heat and dry at 80°C to remove residual ...

Embodiment 2

[0024] (1) Soak graphite powder (with a particle size of about 40-60 μm) in deionized water, and clean it ultrasonically for 40 minutes at 20°C; then put the graphite powder into an oven at 80°C for drying; dry the dried graphite powder Place in a container, add ethanol to immerse it, and stir for 60 minutes in a water bath at 60°C to disperse the graphite powder in ethanol to form a graphite ethanol dispersion system;

[0025] (2) Under the condition of 60°C water bath and stirring, according to the dosage of 100 μL polytetrafluoroethylene (PTFE, 60wt%) suspension per gram of graphite powder, add the PTFE suspension dropwise to the graphite ethanol dispersion system; In a water bath at 60°C, continue to stir until an elastic graphite-PTFE mixture is formed;

[0026] (3) graphite-polytetrafluoroethylene mixture is prepared the graphite-polytetrafluoroethylene particle that particle diameter is 2-3mm by extruding-spheronization method; Heat and dry at 80°C to remove residual e...

Embodiment 3

[0028] (1) Soak graphite powder (with a particle size of about 10-20 μm) in deionized water, and ultrasonically clean it for 50 minutes at 40°C; then put the graphite powder in an oven at 70°C for drying; dry the dried graphite powder Place in a container, add ethanol to submerge it, and stir for 90 minutes in a water bath at 80°C to disperse the graphite powder in ethanol to form a graphite ethanol dispersion system;

[0029] (2) Under the condition of 80°C water bath and stirring, according to the dosage of 85 μL polytetrafluoroethylene (PTFE, 60wt%) suspension per gram of graphite powder, add the PTFE suspension dropwise to the graphite ethanol dispersion system; In a water bath at 80°C, continue to stir until an elastic graphite-PTFE mixture is formed;

[0030] (3) graphite-polytetrafluoroethylene mixture is prepared the graphite-polytetrafluoroethylene particle that particle diameter is 2-3mm by extruding-spheronization method; Heat and dry at 70°C to remove residual eth...

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Abstract

The invention relates to a graphite-polytetrafluoroethylene three-dimensional particle cathode of an MFC (microbial fuel cell) synthesized on basis of hydrogen peroxide and a preparation method. The preparation method comprises the steps of soaking and ultrasonically washing graphite powder, drying the washed graphite powder in a drying box, and then dispersing the dried graphite powder in ethanol; gradually dropwise adding 60(wt)% polytetrafluoroethylene into a graphite ethanol dispersion system under the water-bath heating condition at the temperature of 60 to 80 DEG C, and stirring until the graphite powder forms resilient dough-shaped substances; preparing graphite-polytetrafluoroethylene particles with granularity being 2 to 3mm through an extrusion-rolling method; filling a two-chamber MFC with the dried graphite-polytetrafluoroethylene particles which are used as a three-dimensional electrode, and inserting a graphite rod into a cathode chamber to collect electrons; utilizing a carbon felt as an anode; and establishing a H2O2 three-dimensional air cathode microbial fuel cell. The three-dimensional particle air cathode is large in electrode area and high in mass transfer efficiency. By adopting the graphite-polytetrafluoroethylene three-dimensional particle cathode, the generation of H2O2 is facilitated, and the yield of H2O2 is remarkably increased.

Description

technical field [0001] The invention relates to a method for making air cathodes of microbial fuel cells, in particular to a graphite-polytetrafluoroethylene three-dimensional particle cathode based on MFC synthesized by hydrogen peroxide and a preparation method thereof Background technique [0002] Microbial fuel cell (MFC) is a new wastewater treatment technology that uses the metabolism of electrogenic microorganisms to remove organic pollutants in wastewater while outputting clean electricity. It is usually composed of cathode, anode, electrolyte and external circuit. The principle is that heterotrophic electrogenic bacteria attached to the surface of the anode can directly transfer electrons to the outside of the cell, and through the metabolism of microorganisms, pollutants can be degraded or transform. During the degradation process, electrons and protons are generated at the same time. The electrons are transferred to the cathode through the external circuit throug...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86H01M8/16
CPCY02E60/527H01M4/9075H01M4/96H01M8/16Y02E60/50
Inventor 李楠陈嘉懿王鑫安敬昆任南琪
Owner TIANJIN UNIV
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