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Preparation method of silver electrochemical modified microorganism fuel cell active carbon air cathode

An air cathode and fuel cell technology, applied in battery electrodes, electrical components, circuits, etc., to achieve the effects of low production cost, improved performance, and enhanced ability to catalyze oxygen

Inactive Publication Date: 2014-07-02
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the application of silver electrochemically modified activated carbon as electrodes

Method used

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  • Preparation method of silver electrochemical modified microorganism fuel cell active carbon air cathode
  • Preparation method of silver electrochemical modified microorganism fuel cell active carbon air cathode
  • Preparation method of silver electrochemical modified microorganism fuel cell active carbon air cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Preparation and Characterization of Silver Electrochemically Modified Activated Carbon Air Cathode

[0033] The conductive graphite and PTFE are rolled on the stainless steel side according to the weight ratio of 1:3, and calcined at 340°C for 20 minutes. Activated carbon and PTFE were mixed at a weight ratio of 6:1 and pressed onto the other side of the stainless steel mesh to prepare an activated carbon air cathode.

[0034] Put the prepared activated carbon air cathode into the electrodeposition device, use 2.2mM silver nitrate as the electrolyte, and use Ag / AgCl as the reference electrode, 1cm 2 The platinum sheet was used as the reference electrode, and a three-electrode system was formed with the working electrode. Connect the system to an electrochemical workstation, and conduct electrodeposition at an external voltage of -0.8V for 50s.

[0035] After the deposition, pour out the electrolyte, take out the deposited activated carbon air cathode, wash it ...

Embodiment 2

[0045] Under the same conditions as in Example 1, electrodeposition was carried out for 25 s. Battery performance has also been improved. Under the same external voltage, the current density of the activated carbon air cathode after silver deposition is higher than that of the blank activated carbon air cathode. The activated carbon air cathode after silver electrodeposition was loaded into the battery for cultivation. After the anode microorganisms matured, the measured maximum power density of the microbial fuel cell reached 927mW / cm 2 , the output power is improved relative to the blank activated carbon air cathode.

Embodiment 3

[0047] Under the same conditions as in Example 1, electrodeposition was carried out for 100 s. Battery performance has been improved. Under the same external voltage, the current density of the activated carbon air cathode after silver deposition is higher than that of the blank activated carbon air cathode.

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Abstract

The invention discloses a preparation method for preparing a microorganism fuel battery air cathode by utilizing silver modified active carbon and application of the microorganism fuel cell active carbon air cathode in a battery. The preparation method comprises the following steps of electrically depositing silver on the surface of active carbon by adopting a constant voltage deposition method so as to change the physical and chemical characteristics of the electrode surface, not only can the conductivity of the electrode be improved and the total resistance of the electrode be reduced, but also the catalytic activity of the electrode can be improved, and redox can be favored. Compared with the unmodified electrode, the electricity generation rate and the electricity production quantity of the battery adopting the modified electrode can be remarkably increased. In addition, compared with the precious metal such as platinum, the price for preparing the active carbon air cathode by adopting the silver electric deposition method is low, so that the production cost of the battery is greatly reduced; moreover, the method is simple and easy in operation and easier to popularize in the microorganism cell. The obtained battery has the advantages of simplicity in production of electrode, low price and good electricity generation effect, and the further research and application of the microorganism fuel cell can be favored.

Description

technical field [0001] The invention relates to the preparation of microbial fuel cell electrodes in the technical field of environmental engineering, in particular to a cheap high-performance air cathode for microbial fuel cells and a preparation method thereof. Background technique [0002] Microbial Fuel Cells (MFCs) is a bioreactor that uses microorganisms as an anode catalyst to directly convert the chemical energy in the fuel cell into electrical energy. In recent years, microbial fuel cells have become a research hotspot all over the world. Using it can not only degrade organic matter in water or sludge, but also convert electrons generated by organic matter during microbial metabolism into electric current, thereby obtaining electrical energy. [0003] So far, the power density of microbial fuel cells is still low, and its high cost also limits its practical application. Its performance is affected by many factors, such as the oxidation rate of the substrate by mic...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50H01M4/8853H01M4/9083
Inventor 李克勋蒲良涛张鹏张希陈志豪符舟
Owner NANKAI UNIV
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