Iron ion circulating electrode and preparation method thereof

A technology of iron ions and electrodes, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of low output power density and achieve the effect of increasing output power density

Inactive Publication Date: 2009-06-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the low output power density of the microbial fuel cell with the existing iron ion circulation electrode as ...

Method used

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  • Iron ion circulating electrode and preparation method thereof
  • Iron ion circulating electrode and preparation method thereof
  • Iron ion circulating electrode and preparation method thereof

Examples

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Embodiment 1

[0022] This example is used to illustrate the preparation method of the iron ion circulation electrode provided by the present invention.

[0023] The operation flow of this embodiment is as follows figure 2 shown. After mixing 15 grams of ferric sulfate, 300 grams of 400 mesh graphite powder, 175 grams of 500 mesh kaolin, 5 grams of nickel chloride and 5 grams of polyvinyl alcohol pellets with a diameter of 80 μm, the ball mill was milled for two days to make the powder evenly mixed, and then the dry The powder is directly put into a cylindrical mold with a section diameter of 8cm and a height of 9cm, at 20kgf / cm 2 (kgf / cm2) under pressure, press it into a circular thin plate with a diameter of 8 cm and a thickness of 5 mm, place the pressed thin plate in a muffle furnace, feed nitrogen, and calcine at a constant temperature of 1100 ° C for 12 hours , made of iron ion circulation electrode, and finally cut into a cuboid electrode with a size of 50mm×50mm×5mm.

[0024] The...

Embodiment 2

[0039] This example is used to illustrate the preparation method of the iron ion circulation electrode provided by the present invention.

[0040] The difference from Example 1 is that 5 grams of polyvinyl alcohol pellets with a diameter of 80 μm are replaced by 8 grams of polyethylene pellets with a diameter of 60 μm, and 15 grams of chloroform are added to the mixture after ball milling, and then put into the mold after mixing In, other operating conditions and steps are identical with embodiment 1. The total volume of pores measured according to the method described in Example 1 is 15% of the total volume of the electrode prepared in this example.

Embodiment 3

[0045] This example is used to illustrate the method for preparing a microbial fuel cell using the iron ion circulating electrode prepared in Example 1 as a cathode.

[0046] Such as image 3 As shown, a cuboid plexiglass container with a size of 15cm (length) × 12cm (width) × 8cm (height) is used as the anode chamber of the battery, and the top of the container is a detachable cover plate with 8 small holes. Wherein 3 is the electrode wire outlet (6 wire outlets), 1 is the gas inlet, and 2 is the gas outlet. Open a stepped square window 6 on one side of the container, its outer layer size is 5cm, and the inner layer size is 4cm, and 4 screw holes are set around the window, using the screw holes, the made in Example 1 The iron ion circulation electrode is fixed on the window 6 as the cathode, and the proton exchange membrane 5 (Nafion-117, Dupont) is used to separate the cathode electrode plate 4 and the anode chamber 8, and a vacuum pad is used between the proton exchange me...

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Abstract

The invention provides an iron ion circulating electrode which contains ferric sulfate, graphite powder, kaolin and nickelous chloride and has a porous structure. The invention also provides a method for preparing the iron ion circulating electrode, which comprises the steps: the graphite powder, the ferric sulfate, the kaolin, the nickelous chloride and pore creating material are mixed together for ball milling, and then the mixture processed by ball milling is pressed for forming under the pressure intensity of 10-30kgf/cm<2>; after that, the formed mixture is calcined for 8-15 hours at the temperature of 1000-1200 DEG C in shielding gas atmosphere. Compared with the existing iron ion circulating electrode, the iron ion circulating electrode (especially prepared by the method of the invention) can be taken as the cathode of a microbiological fuel cell, so as to remarkably improve the output power density of the microbiological fuel cell.

Description

technical field [0001] The invention relates to an iron ion circulating electrode and a preparation method thereof. Background technique [0002] The main function of the microbial fuel cell cathode is to transfer electrons to the electron acceptor under the action of the catalyst to complete the reduction half-reaction, that is, O 2 +4H + +4e - →2H 2 O. The voltage loss caused by the cathode and the cathode chamber is mainly concentrated in two parts: activation loss and mass transfer loss, in which activation loss is related to the catalyst, and mass transfer loss is related to proton transfer and electron acceptor types. The cathode usually uses carbon cloth or carbon paper as the substrate, and the catalyst is sprayed or attached to the cathode by screen printing technology. The catalyst can reduce the activation energy of the cathode reaction, speed up the reaction speed, and reduce the electrochemical activation resistance. At present, microbial fuel cells The cat...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 祝学远
Owner BYD CO LTD
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