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

[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 ...

[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.

[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.