MICROBIAL FUEL CELL

• Main Authors: NAOI KATSUHIKO, OKITA NAOHISA, OTA KENICHI, MATSUMURA KEISUKE, NAOI KAZUKO
• Format: Patent
• Language: English; Japanese
• Published: 15.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a microbial fuel cell that has reduced the time until when expected power is obtained even if it is installed in an environment with a large amount of dissolved oxygen.SOLUTION: A microbial fuel cell comprises a negative electrode, a positive electrode, an ion conductor, and an anaerobic condition generating and maintaining layer (anaerobic layer). The negative electrode and the positive electrode are connected with each other with the ion conductor therebetween. The anaerobic layer covers a surface of the negative electrode to which organic matter is supplied. The anaerobic layer transmits the organic matter therethrough, and executing the following experiment results in DO2/DO1 of 80% or less. Experiment: a connection pipe between a first cell and a second cell is partitioned by the anaerobic layer. The first cell and the second cell include first upper opening and a second upper opening, respectively. The first upper opening is opened and the first cell is constantly exposed to atmospheric air. The second cell is filled with pure water, the second upper opening is opened and the pure water is exposed to atmospheric air, and the amount of dissolved oxygen in the pure water in which oxygen is dissolved in a saturated amount (DO1) is measured. The pure water is bubbled with nitrogen gas, the second upper opening is closed, and after the lapse of 25 hours, the amount of dissolved oxygen in the pure water (DO2) is measured.SELECTED DRAWING: Figure 1 【課題】 溶存酸素量の多い環境に設置されても期待される電力が得られるまでの時間が短い微生物燃料電池を提供すること。【解決手段】 微生物燃料電池は、負極と正極とイオン伝導体と嫌気性条件生成・維持層（嫌気性層）とを備え、負極と正極とはイオン伝導体を介して接続され、嫌気性層は、負極の、有機物が供給される側の面を覆い、嫌気性層は、有機物を透過し、かつ、下記実験を行うと、ＤＯ２／ＤＯ１が８０％以下である。実験：第１セルと第２セルとの間の接続管は嫌気性層で隔てられ、第１、第２セルはそれぞれ第１、第２の上部開口を含み、第１の上部開口は開放されて第１セルは大気に常時曝され、第２セルは純水で満たされ、第２の上部開口は開放されて純水は大気に曝され、酸素が飽和量溶け込んだ純水の溶存酸素量（ＤＯ１）を測定し、純水を窒素ガスバブリングし、第２の上部開口を閉じ、２５時間経過後、純水の溶存酸素量（ＤＯ２）を測定する。【選択図】 図１