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Microbial fuel cell

Foreign code F110003961
File No. E08901WO
Posted date Jul 7, 2011
Country EPO
Application number 09724654
Gazette No. 2270915
Gazette No. 2270915
Date of filing Mar 27, 2009
Gazette Date Jan 5, 2011
Gazette Date May 3, 2017
International application number JP2009056385
International publication number WO2009119846
Date of international filing Mar 27, 2009
Date of international publication Oct 1, 2009
Priority data
  • P2008-086195 (Mar 28, 2008) JP
  • P2008-249178 (Sep 26, 2008) JP
  • 2009WO-JP56385 (Mar 27, 2009) WO
Title Microbial fuel cell
Abstract (EP2270915)
It is an object of the present invention to provide a microbial fuel cell capable of increasing a current density without employing a mediator.
The microbial fuel cell 1 includes a 3-dimensionally structured agglomerate formed from conductive fine particles 2 and microorganisms 3.
In the agglomerate 4, the conductive fine particles 2 disperse among pieces of Shewanella 3 and the conductive fine particles 2 are coupled to one another to hold Shewanella 3, thus forming the 3-dimensional structure as a whole.
Accordingly, with respect to Shewanella 3, conductive fine particles 2 hold Shewanella 3a on a surface of an electrode 103 and even Shewanella 3b positioned vertically away from the surface of the electrode 103.
Hence, it becomes possible that more pieces of Shewanella 3 are allowed to transfer electrons.
Scope of claims [claim1]
1. A microbial fuel cell equipped with a pair of electrodes and an external circuit electrically connecting a pair of said electrodes, wherein on a negative electrode that is one of said electrodes, 3-dimensionally structured agglomerates are formed in a solution containing conductive fine particles and microorganisms with an extracellular electron transfer capability and then said conductive fine particles transfer electrons from said microorganisms to said negative electrode.
[claim2]
2. The microbial fuel cell according to claim 1, wherein said conductive fine particles disperse among said microorganisms and further said conductive fine particles are coupled to one another to hold said microorganisms.
[claim3]
3. The microbial fuel cell according to claim 1 or claim 2, wherein said conductive fine particles include ferric oxide.
[claim4]
4. The microbial fuel cell according to claim 3, wherein said conductive fine particles include alpha -Fe 2O 3, alpha -FeOOH, gamma -Fe 2O 3, epsilon -Fe 2O 3 or Fe 3O 4.
[claim5]
5. The microbial fuel cell according to claim 1 or claim 2, wherein said conductive fine particles include ferric sulfide.
[claim6]
6. The microbial fuel cell according to claim 5, wherein said conductive fine particles are obtained by biosynthesis of microorganisms in an environment where ferric ions and sulfide ions coexist.
[claim7]
7. The microbial fuel cell according to claim 1 or claim 2, wherein said conductive fine particles include manganese oxide.
[claim8]
8. The microbial fuel cell according to any of claims 1 to 7, wherein said microorganisms are metal-reducing bacteria.
[claim9]
9. The microbial fuel cell according to claim 8, wherein said metal-reducing bacteria include bacteria of a Shewanella group, a Geobacter group, a Rhodoferax group or a Pseudomonas group.
[claim10]
10. The microbial fuel cell according to claim 8, wherein said metal-reducing bacteria contain Shewanella loihica or Shewanella oneidensis.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • Inventor
  • HASHIMOTO KAZUHITO
  • NAKAMURA RYUHEI
  • KAI FUMIYOSHI
  • WATANABE KAZUYA
  • KATO SOICHIRO
IPC(International Patent Classification)
Reference ( R and D project ) ERATO HASHIMOTO Light Energy Conversion AREA
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