阅读说明：本技术 一种高比表面积石墨烯海底沉积层微生物燃料电池电极 (High specific surface area graphene seabed sedimentary layer microbial fuel cell electrode ) 是由 王冠程 陈同来 付玉彬 郭洪云 于明仕 赵荣荣 于 2018-08-28 设计创作，主要内容包括：一种高比表面积石墨烯海底沉积层微生物燃料电池电极,电极为负载石墨烯材料的导电纤维,纤维经金属丝铰接形成圆柱状电极,金属丝之间经导电刚性框架固定,以防海流作用造成移动,使用时置于海底沉积层中,或置于海底沉积层/海水界面上方。本发明因电极中引入石墨烯材料而具有极大的比表面积,显著提高了实海环境中电池的综合性能。(A high specific surface area graphene seabed sedimentary layer microbial fuel cell electrode is a conductive fiber loaded with graphene materials, the fiber is hinged through metal wires to form a cylindrical electrode, the metal wires are fixed through a conductive rigid frame to prevent movement caused by ocean current, and the electrode is placed in a seabed sedimentary layer or above a seabed sedimentary layer/seawater interface when in use. The graphene material is introduced into the electrode, so that the graphene composite material has a large specific surface area, and the comprehensive performance of the battery in the real sea environment is remarkably improved.)

1. A microbial fuel cell electrode for a seabed sedimentary layer beneficial to use in real sea is characterized in that the surface of electrode fiber is covered with a graphene material.

2. The microbial fuel cell electrode of claim 1, wherein the electrode fibers are high conductivity fibers to improve cell performance.

3. The microbial fuel cell electrode of claim 1, wherein a viscous high molecular polymer is used as an adhesive between the surface of the electrode fiber and the graphene material, so as to improve the adhesion and mechanical strength between the graphene and the surface of the fiber.

4. The microbial fuel cell electrode of claim 1, wherein the fibers are uniformly strung with graphene-coated adhesive high polymer microspheres or micro-sheets.

5. The electrode of claim 1, wherein the electrodes are fixed to each other by a conductive rigid frame for resisting movement caused by ocean currents.

Technical Field

The invention belongs to the technical field of ocean energy power generation, and relates to an electrode of a microbial cell, which is used for a seabed sedimentary layer.

Background

A Microbial Fuel Cell (MFC) is a device that converts chemical energy in organic or inorganic substances into electrical energy using microorganisms. Microorganisms decompose inorganic or organic substances in an anaerobic environment, i.e. a seabed sediment layer (anode), to release electrons, and the electrons flow through a cathode through an electron transfer medium to form current.

Seabed sediment layer microbial fuel cell electrode (BMFCE), also known as sea mud/seawater microbial fuel cell electrode. The special microbial fuel cell electrode works in a real sea environment, can be placed in a seabed sediment layer, collects electrons released by decomposing inorganic or organic matters by more sediment layer microbes by utilizing the high specific surface area of the special microbial fuel cell electrode, or is placed above a seabed sediment layer/seawater interface, and improves the comprehensive performance of the cell by utilizing the excellent conductivity of the special microbial fuel cell electrode.

The specific surface area of the BMFCE is about 0.1524 m/g at present, the low specific surface area becomes a main factor limiting the electron collecting capacity of the BMFCE, and the specific surface area of the electrode is greatly improved in a mode of coating an electrode fiber material with graphene, so that the performance of the battery is optimized.

With the acceleration of the construction of the ocean forcing country, the marine ecological civilized construction is promoted, the force for protecting the marine ecological environment is increased, and the detection of the ocean is also emphasized more and more. At present, electrodes placed in high-energy lead-acid storage batteries and the like used by the submarine detection device mostly affect the marine environment. Under the strong pressure of the sea bottom, conditions such as battery rupture, electrode bare leakage and electrolyte leakage are likely to occur, and the pollution to the marine environment is caused. Therefore, it is important to develop an environmentally-friendly and long-life battery electrode, and the emergence of BMFCE provides a good choice for the battery, so that people can make zero influence on the marine ecological environment while detecting at the seabed.

At present, carbon felt, carbon paper, carbon fiber and the like are used as electrode materials of the seabed settled layer microbial fuel cell, the carbon materials can be widely applied to BMFCE, and the carbon fiber becomes a main choice of the seabed settled layer microbial fuel cell electrode in consideration of factors such as high conductivity, operability, softness and specific surface area.

In order to ensure that the battery can normally work in a practical environment, the BMFCE loaded with the graphene material is designed and invented to cope with a complex marine environment.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the BMFCE loaded with the graphene material, which has the advantages of stable structure, convenience in operation, controllable fiber quantity, controllable quantity of sticky high-molecular polymer microspheres coated with graphene and seawater scouring resistance.

The technical scheme of the invention is as follows:

a high specific surface area graphene seabed deposited layer microbial fuel cell electrode, which is characterized by comprising: the high-specific-surface-area seabed sediment layer microbial fuel cell electrode is formed by hinging conductive carbon fibers loaded with graphene materials on the surface through metal wires, the specific surface area of the fibers is obviously increased due to the graphene loaded on the surface, the collection of electrons generated by catalyzing and oxidizing organic or inorganic matters by the microbes in the seabed sediment layer is facilitated, and the graphene has excellent conductive performance, so that the performance of the cell is integrally improved. In addition, metal hinge fibers facilitate the containment of more fibers in the limited space of the battery. The adhesive high-molecular polymer microspheres are arranged between the graphene and the conductive carbon fibers, so that the graphene is adhered and fixed, sufficient strength is ensured to resist the scouring of seawater, the service life of the battery is prolonged, and the maintenance and replacement cost of the battery is reduced.

Compared with the prior art, the invention has the beneficial effects that:

the invention is a seabed sediment layer biofuel cell electrode, the specific surface area of the existing fiber is 0.1524 m/g, the specific surface area of the electrode fiber of the invention is 15.2440 m/g, the specific surface area of the electrode is enlarged by more than 100 times, so that the capability of collecting seabed sediment layer electrons is obviously enhanced.

The surface of the fiber is modified and then is bonded with the graphene material through the viscous high-molecular polymer, so that the capability of resisting seawater scouring is effectively improved, and the stability of the battery is improved.

The metal wires are fixed through the conductive rigid frame, so that the overall stability of the battery structure is improved.

The graphene material is uniformly loaded on the surface of the carbon fiber, so that the conductivity of the electrode is effectively improved, and the performance of the battery is optimized.

CV of existing minute fiberArea of the figure envelope is S₁=1.157*10^-3V·A·m^-2The area of the CV diagram of the invention is S₂=1.265*10^-3V·A·m^-2Capacity performance C of existing very small amount of fibres₁=3.61*10^-1F/m²Very small amount of the capacitive property C of the present invention₂=3.95*10^-1F/m²The growth is 8.3 percent on a same scale.

Drawings

Fig. 1 is a schematic structural diagram of a high specific surface area graphene seabed sediment layer microbial fuel cell electrode of the invention.

(1) Conductive rigid frame (2) seabed sediment layer biological fuel cell electrode

Fig. 2 is a schematic view of a micro-scale of an electrode of a microbial fuel cell of the present invention.

(1) Adhesive high-molecular polymer microsphere coated by metal wire (2), conductive fiber (3) and graphene

Detailed Description

Due to ocean currents, tides, microbial corrosion, adhesion of marine organisms and the like, greater challenges are provided for the service life of the electrode of the seabed sedimentary layer biofuel cell, such as electrode falling caused by the back-and-forth swing of the traction electrode under the action of the ocean currents and the shaking of the electrodes by the marine organisms. The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention in more detail, and the protection scope of the present invention is not limited thereby.