Microbial fuel cell air cathode and preparation method thereof

An air cathode and fuel cell technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems affecting oxygen diffusion, catalyst loading error, catalyst performance interference, etc., and achieve the effect of increasing the three-phase interface and reducing resistance

Active Publication Date: 2012-09-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this method are: 1. The manual brushing method will have large errors in the thickness of the air diffusion layer and the catalyst loading capacity made by different producers due to the difference in personal techniques and brushes, even if the same person has more than one There may be similar errors in the air cathode produced next time; 2. Using hydrophilic nafion solution as the binder of the catalyst cannot form a hydrophobic oxygen diffusion channel in the catalytic layer, thereby affecting the diffusion of oxygen in the catalytic layer; 3. The method of making air cathodes by brushing is time-co...

Method used

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  • Microbial fuel cell air cathode and preparation method thereof
  • Microbial fuel cell air cathode and preparation method thereof
  • Microbial fuel cell air cathode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A preparation method for the air cathode of the microbial fuel cell, the steps are as follows:

[0028] 1) 1.2g powder (specific surface area is 100m 2 / g) Conductive carbon black is placed in a beaker, and 50ml of ethanol is added to immerse it, and ultrasonically stirred at a temperature of 30°C for 30 minutes to fully disperse and dissolve the conductive carbon black in ethanol;

[0029] 2) Under the condition of ultrasonic and stirring, add 3.6g of PTFE emulsion with a concentration of 60% by weight dropwise, the mass ratio of PTFE emulsion and conductive carbon black is 3: 1, and continue ultrasonic and stirring for 30min;

[0030] 3) Place the above-mentioned container in a water bath at 80°C, and continue stirring until an elastic dough-like substance is formed;

[0031] 4) Take out the dough-like substance and knead it evenly in your hands, then place it on a roller press and roll it into a uniform diffusion layer film with a thickness of 0.3mm;

[0032] 5) Th...

Embodiment 2

[0041] A method for preparing the air cathode of the microbial fuel cell, the preparation steps of this embodiment are basically the same as in Example 1, the difference is that in the preparation of the active layer film step 7), the mass ratio of the PTFE emulsion to the supercapacitor activated carbon is 1 : 6, that is, the consumption of supercapacitor activated carbon is 4.2g.

[0042] The SEM image of the air catholyte side active layer that this embodiment obtains is as follows figure 2 (b) shown. Compared figure 2 (a) It can be seen that compared with the air cathode prepared in Example 1, the air cathode prepared in this embodiment has less cross-linked filaments, which confirms that the filaments are formed by PTFE after rolling and curing at high temperature In the non-biological half-cell, the air cathode prepared in this embodiment is used as the working electrode, and the platinum sheet is used as the counter electrode to measure the AC impedance spectrum as ...

Embodiment 3

[0044] A method for preparing the air cathode of the microbial fuel cell, the preparation steps of this embodiment are basically the same as in Example 1, the difference is that in the preparation of the active layer film step 7), the mass ratio of the PTFE emulsion to the supercapacitor activated carbon is 1 : 8, that is, the consumption of supercapacitor activated carbon is 5.6g.

[0045] In the non-biological half-cell, the air cathode prepared in this embodiment is used as the working electrode, and the platinum sheet is used as the counter electrode to measure the AC impedance spectrum as follows: image 3 As shown, the frequency range is 100KHz-0.01Hz. From image 3 It can be seen from the figure that the AC impedance spectrum of the air cathode obtained in this embodiment is in the same form as the AC impedance spectrum of the air cathode obtained in Examples 1 and 2. Due to the reduction of the content ratio of PTFE in the active layer, the The adhesion between the a...

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Abstract

The invention discloses a microbial fuel cell air cathode which is composed of a diffusion layer thin film, a stainless steel net and an active layer thin film in an overlapped mode from an air side to an electrolyte side. The preparation method comprises the following steps of: mixing a carbon powder material which has good electrical conductivity and is hydrophilic and PTFE (Poly tetra fluoro ethylene) emulsion which is hydrophobic and is air conductive in ethanol; clustering through ultrasound and water bath; and finally rolling into a thin-film-shaped diffusion layer and an active layer; with the stainless steel net as an electrical conductive framework, overlapping and rolling so as to form the air cathode. The microbial fuel cell air cathode and the preparation method thereof have the following advantages: according to the preparation method, since electrical conductive carbon black is added into the air diffusion layer, the resistance of an air diffusion electrode is reduced; since the ultrasound stirring is carried out after the PTFE emulsion is dropped in, uniform and fine air holes can be formed in the electrode and the three-phase interface reduction site in the active layer is increased; and heating and curing are carried out twice in a muffle furnace, thus PTFE forms an air conveying pore canal of a three-dimensional network structure, the three-phase interface in the active layer is increased, and the microbial fuel cell air cathode is applicable to normalized mass production.

Description

technical field [0001] The invention relates to a method for manufacturing an air cathode of a microbial fuel cell, in particular to an air cathode of a microbial fuel cell and a preparation method thereof. Background technique [0002] Microbial fuel cell is a device that can convert biomass energy into electrical energy. It has the advantages of strong substrate adaptability, mild operating conditions, energy production without input energy, environmental friendliness, high reliability, and sustainable utilization. Especially when sewage is used as fuel, the effect of sewage treatment can also be achieved. Air diffusion electrodes using cheap and readily available oxygen as electron acceptors have been widely used in commercial fuel cells and metal-air batteries, such as alkaline metal-air batteries produced by ALUPOWER and Evionyx in the United States. Although air cathode is the most researched cathode form in microbial fuel cells, it is currently limited to the self-us...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 董恒于宏兵王鑫
Owner NANKAI UNIV
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