CN108574105A - A kind of air cathode of microbiological fuel cell - Google Patents
A kind of air cathode of microbiological fuel cell Download PDFInfo
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- CN108574105A CN108574105A CN201810487649.9A CN201810487649A CN108574105A CN 108574105 A CN108574105 A CN 108574105A CN 201810487649 A CN201810487649 A CN 201810487649A CN 108574105 A CN108574105 A CN 108574105A
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- Prior art keywords
- fuel cell
- thin slice
- air cathode
- charcoal
- microbiological fuel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Inert Electrodes (AREA)
Abstract
The invention discloses a kind of air cathodes of microbiological fuel cell, are positioned in heating device by cork wood thin slice, and the charcoal thin slice being sintered in 800 ± 50 DEG C of anaerobic atmosphere is prepared.The major advantage of invention is：Preparation process need not use the substances such as bonding agent and PTFE, be a kind of non-harmful production process of environment；It prepares raw material and has only used natural cork wood, be a kind of reproducible resource；Catalyst and air diffusion admittance are distributed in orderly pore structure, be ensure that oxygen is reacted with coming into full contact with for catalyst surface, are improved cathode reaction efficiency and battery overall performance.
Description
Technical field
The invention belongs to technological field of biochemistry, and in particular to a kind of air cathode and its system of microbiological fuel cell
Preparation Method.
Background technology
Microbiological fuel cell is a kind of biochemical reaction device that can be produced electricity, and basic functional principle is microorganism decomposition
With extracellular release electronics during organic matter, lasting electric energy can be generated by collecting these free electrons.Due to micro- life
Object fuel cell can produce electricl energy while degrading a variety of organic wastes, it is considered to be a kind of novel, low (nothing) energy
The wastewater processing technology of consumption has great application potential solving the fields such as water body, soil pollution.
In microbiological fuel cell, electron acceptor receives the freely electricity by anode Microbiological release near cathode electrode
Reduction reaction occurs after son.Due to the easy availability of oxygen, spatter property (product：Water) and the advantages that higher reaction overpotential,
In numerous microbiological fuel cell systems, oxygen has become the most widely used electron acceptor.In recent years, scientist is
It realizes the direct utilization to atmospheric oxygen, has devised energy-efficient air cathode electrode.It is currently used widest
Air cathode preparation method is (Cheng, the S.A. put forward by Logan et al.；Logn,B.E.,Electrochemistry
Communication,2006,8,(3),489‐494.).This method is in ventilative conductive substrates (such as carbon cloth, stainless (steel) wire) two
Side builds air diffusion layer material and catalyst layer respectively.For example, coated with multiple layer has the polytetrafluoroethylene (PTFE) of hydrophobic, air-permeability property
(PTFE) molding is re-sintered after lotion, just forms electrode air diffusion layer；And then pass through bonding agent in the conductive substrates other side
(such as electroconductive resin Nafion) re-sinters film forming, as catalyst layer after fixing catalyst (platinum, activated carbon) particle.2012
Year, Wang Xin (Wang Xin) et al. improves traditional air cathode manufacture craft, and uniformly PTFE is mixed using ultrasound, stirring
After carbon black granules, recycles roller that obtained mixture is compressed in stainless (steel) wire substrate and obtain air diffusion layer
(Dong H.,Wang X.,Environmental Science&Technology,2012,46,13009-13015).By same
Catalyst activity layer is compressed on the other side of stainless (steel) wire by the method for sample again.However, this preparation method be directed to by
The raw material of Multiple components can just obtain final electricity by multiple steps, such as stirring, coating, pressing mold, sintering assembling sizing
Pole.Therefore, original making air cathode method there are the problem of have：1, largely using chemical bonding agent and PTFE etc. to environment
Poisonous and hazardous substance, this causes it to be not used in the deposits microbiological fuel cell such as ocean, wetland, lake；2, it makes
Step is various, time-consuming, is unsuitable for industrial standardization production, there are larger differences for made electrode quality level.These problems are not
Only constrain the popularization of air cathode in practical applications, also limit biological fuel cell overall performance and reaction efficiency into
One step improves.
Invention content
Purpose of the present invention is to defects existing for air cathode preparation method for the above-mentioned prior art, provide a kind of letter
Easily, efficiently, the biological fuel cell air cathode and preparation method thereof of economical and energy saving.
In order to solve the above technical problems, the technical solution of first aspect present invention is：A kind of sky of microbiological fuel cell
Gas cathode is made by the thermally treated obtained charcoal thin slice of cork wood.
In a currently preferred technical solution, cork wood thin slice is positioned in heating device, in 800 ± 50 DEG C of anaerobic
The charcoal thin slice being sintered in atmosphere.
In a currently preferred technical solution, heating device is preferably that tube furnace or other those skilled in the art are contemplated that
Applicable heating device.
In a currently preferred technical solution, it is sintered 30-120 minutes, is preferably sintered 60-90 minutes.
In a currently preferred technical solution, the thickness of charcoal thin slice is 2.0mm~5.5mm, it is preferable that charcoal
The thickness of thin slice is 2.6mm, 3.5mm, 4.5mm.
A kind of charcoal thin slice of the second aspect of the present invention offer is used for microbial fuel cell air cathode.
In a currently preferred technical solution, cork wood thin slice is positioned in heating device, in 800 ± 50 DEG C of anaerobic atmosphere
It encloses middle sintering and obtains charcoal thin slice.
In a currently preferred technical solution, the thickness of charcoal thin slice is 2.0mm~5.5mm, it is preferable that charcoal
The thickness of thin slice is 2.5mm~4.5mm, and further, the thickness of charcoal thin slice is 2.6mm, 3.5mm, 4.5mm.
In the present invention, word cork wood is a kind of Bombacaceae, ochroma lagopus arbor, scientific name Ochroma pyramidale or
Ochroma lagopus.South America torrid areas is originated in, material is special light.Timber appearance is similar to kahikatea or linden.
The present invention is prepared for the microorganism fuel cell cathode of multiple and different thickness by a step heat-treating methods.This
The major advantage of invention is：Preparation process need not use the substances such as bonding agent and PTFE, be a kind of non-harmful life of environment
Production process；It prepares raw material and has only used natural cork wood, be a kind of reproducible resource；Making step is simple, is omitted existing
3-5 step (for example, mixing of milling, molding bonded, firing fusion) in method；And catalyst and air diffusion admittance are distributed
In the orderly pore structure of cathode of the present invention, it ensure that oxygen is reacted with coming into full contact with for catalyst surface, it is anti-to improve cathode
Answer efficiency and battery overall performance.
Description of the drawings
Fig. 1 is the scanning electron microscopy of air cathode electrode surface prepared by the present invention.
Fig. 2 is the scanning electron microscopy of air cathode electrode side section prepared by the present invention.
Fig. 3 show on charcoal air cathode test redox reactions cyclic voltammetry curve (dotted line is in sky
It is tested under the conditions of the equal no oxygen of solution and air side of gas cathode；Solid line is no oxygen in the solution, and air side has oxygen
Under the conditions of test)
Output voltage when Fig. 4 is the single-chamber microbial fuel cell continuous operation for being mounted with air cathode of the present invention.
Fig. 5 is the power curve of this air cathode Soil sediment microbiological fuel cell.
Specific implementation mode
The specific embodiment of the invention is described below in conjunction with attached drawing.
Embodiment 1：
A kind of air cathode preparation process of the microbiological fuel cell is：
The cork wood thin slice that the thickness of well cutting is about 4mm is positioned in tube furnace, is removed using nitrogen stream and vacuum pump
In pipe after oxygen, keeps suitable nitrogen stream by quartz ampoule, 100 are cooled to after being kept for 90 minutes after being heated to 800 degrees Celsius
It is taken out to get to charcoal thin slice air cathode electrode after degree.
The thickness of electrode that the example obtains about 3.5mm can disposably prepare 10-15 plate electrodes, can also be held according to reactor
Amount increases or decreases the quantity of batch electrode.According to scanning electron microscopy as a result, electrode surface by continuous layer structure
Composition, and there are Liquid Penetrant channels；And the result of sectional side view shows and is made of orderly pore structure inside charcoal thin slice,
The shape in hole is irregular polygon, and diameter is distributed between 10-40 microns.These evidences show these charcoal thin slices
Porous channel structure comes from the wood cell of raw material cork wood, and this three-D space structure provides largely for air cathode
Oxygen transmission channel, and form the solid-liquid on micro-scale-gas three phase boundary (Fig. 1)；In addition, electrochemistry cyclic voltammetric is surveyed
Test result shows higher catalytic activity (Fig. 2) of the charcoal to redox reactions.Therefore, prepared charcoal thin slice has
Two conditions of air cathode indispensability, not only can react (ORR) with catalytic oxygen reduction method, but also contain a large amount of micro-meter scale hole
Structure serves as oxygen diffusion admittance.
Prepared charcoal air cathode is mounted on the biological fuel cell of single chamber, utilizes the sodium acetate mould of 1g/L
Quasi- sanitary wastewater, adds the mixed nutrient solution of micro minerals and vitamins b, the battery continuously-running was more than four months
More than, in 1000 ohm load output voltages about 0.33V (Fig. 4：6 periods).
Such as the charcoal air cathode is provided in rice terrace sediment, this is measured after running after a period of time
The maximum power of rice terrace deposit microbiological fuel cell reaches 70mW/m2(Fig. 5).
Embodiment 2：
A kind of preparation method of the microbial fuel cell air cathode, implementation step is same as Example 1, but anti-
The thickness of the cork wood of raw material is answered to be changed to about 3mm.
The thickness of the charcoal thin slice obtained in the embodiment is respectively 2.6mm.Its microstructure is produced with 1 gained of embodiment
Condition is the same as (Fig. 1 and 2).The charcoal thin slice air cathode, should after running after a period of time in rice terrace sediment
The maximum power about 50mW/m of rice terrace deposit microbiological fuel cell2(Fig. 5).
Embodiment 3：
A kind of preparation method of the microbial fuel cell air cathode, implementation step is same as Example 1, but anti-
The thickness of the cork wood of raw material is answered to be changed to about 5mm.
The thickness of the charcoal thin slice obtained in the embodiment is respectively 4.5mm.The charcoal obtained in the embodiment is thin
The thickness of piece is respectively 2.6mm.Its microstructure is identical as 1 products obtained therefrom of embodiment (Fig. 1 and Fig. 2).The charcoal thin slice is empty
Gas cathode is in rice terrace sediment, and the rice terrace deposit microbiological fuel cell is most after running after a period of time
High-power about 65mW/m2(Fig. 5).
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited by examples detailed above, described in examples detailed above and specification is to illustrate the present invention
Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these variation and
Improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its is equal
Object defines.
Claims (9)
1. a kind of air cathode of microbiological fuel cell, which is characterized in that it is thin by the thermally treated obtained charcoal of cork wood
Piece is made.
2. the air cathode of microbiological fuel cell according to claim 1, which is characterized in that it is placed by cork wood thin slice
In heating device, the charcoal thin slice being sintered in 800 ± 50 DEG C of anaerobic atmosphere is prepared.
3. the air cathode of microbiological fuel cell according to claim 2, which is characterized in that heating device is preferably managed
Formula stove.
4. the air cathode of microbiological fuel cell according to claim 1, which is characterized in that sintering 30-120 minutes.
5. the air cathode of microbiological fuel cell according to claim 1, which is characterized in that the thickness of charcoal thin slice
For 2.0mm~5.5mm.
6. a kind of charcoal thin slice is used for microbial fuel cell air cathode.
7. purposes according to claim 6, which is characterized in that the charcoal thin slice is that cork wood thin slice is positioned over heating
In device, it is sintered and obtains in 800 ± 50 DEG C of anaerobic atmosphere.
8. purposes according to claim 6, which is characterized in that the thickness of charcoal thin slice is 2.0mm~5.5mm.
9. purposes according to claim 6, which is characterized in that the thickness of charcoal thin slice is 2.6mm, 3.5mm, 4.5mm.
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| CN201810487649.9A CN108574105A (en) | 2018-05-21 | 2018-05-21 | A kind of air cathode of microbiological fuel cell |
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| CN201810487649.9A CN108574105A (en) | 2018-05-21 | 2018-05-21 | A kind of air cathode of microbiological fuel cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109860644A (en) * | 2019-01-24 | 2019-06-07 | 江苏大学 | A kind of application of linden three-dimensional carbon electrode in microbiological fuel cell |
| CN110752379A (en) * | 2019-10-31 | 2020-02-04 | 大连理工大学 | Preparation method of one-step formed biochar cathode |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241662A (en) * | 2014-08-27 | 2014-12-24 | 中国科学院广州能源研究所 | Preparation method of charcoal for cathode catalyst of microbial fuel cell |
| CN105375049A (en) * | 2015-12-11 | 2016-03-02 | 重庆大学 | Carbon tubular oxygen reduction cathode microbial fuel cell and preparation method thereof |
| CN106744791A (en) * | 2016-11-30 | 2017-05-31 | 中国工程物理研究院化工材料研究所 | The preparation method of cellular porous carbon material |
-
2018
- 2018-05-21 CN CN201810487649.9A patent/CN108574105A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241662A (en) * | 2014-08-27 | 2014-12-24 | 中国科学院广州能源研究所 | Preparation method of charcoal for cathode catalyst of microbial fuel cell |
| CN105375049A (en) * | 2015-12-11 | 2016-03-02 | 重庆大学 | Carbon tubular oxygen reduction cathode microbial fuel cell and preparation method thereof |
| CN106744791A (en) * | 2016-11-30 | 2017-05-31 | 中国工程物理研究院化工材料研究所 | The preparation method of cellular porous carbon material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109860644A (en) * | 2019-01-24 | 2019-06-07 | 江苏大学 | A kind of application of linden three-dimensional carbon electrode in microbiological fuel cell |
| CN110752379A (en) * | 2019-10-31 | 2020-02-04 | 大连理工大学 | Preparation method of one-step formed biochar cathode |
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