Electromethanogenesis
Electromethanogenesis is a form of
Methane producing technologies garnered interest from the scientific community prior to 2000, but electromethanogenesis did not become a significant area of interest until 2008. Publications concerning catalytic methanation have increased from 44 to over 130 since 2008.[4] Electromethanogenesis has drawn more research due to its proposed applications. The production of methane from electrical current may provide an approach to renewable energy storage.[1][4] Electrical current produced from renewable energy sources may, through electromethanogenesis, be converted into methane which may then be used as a biofuel.[1][4] It may also be a useful method for the capture of carbon dioxide which may be used for air purification.[1]
In nature, methane formation occurs
(1) CO2 + 8H+ + 8e− ↔ CH4 + 2H2O
(2) CO2 + 4H2 ↔ CH4 + 2H2O
Biocathode
A biocathode is a cathode used in a microbial electrolysis cell during electromethanogenesis that utilizes microorganisms to catalyze the process of accepting electrons and protons from the anode.[8] A biocathode is usually made of a cheap material, such as carbon or graphite, like the anode in the MEC.[5] The microbe population that is placed on the biocathode must be able to pick up electrons from the electrode material (carbon or graphite) and convert those electrons to hydrogen.[8][5]
Mechanism
The mechanism of electromethanogenesis is outlined in Figure 1. Water is introduced into the system with the anode, biocathode, and microbes. At the anode, microbes attract H2O molecules which are then oxidized after an electrical current is turned on from the power source. Oxygen is released from the anode side. The protons and electrons oxidized from the H2O move across the membrane where they move into the material that makes up the biocathode. The new microbe on the biocathode has the ability to transfer the new electrons from the biocathode material and convert them into protons. These protons are then used in the major pathway that drives methane production in electromethanogenesis—CO2 reduction. CO2 is brought in on the biocathode side of the system where it is reduced by the protons produced by the microorganisms to yield H2O and methane (CH4+). Methane is produced and can then be released from the biocathode side and stored.[4][6][7][9]
Limitations
One limitation is the energy loss in methane-producing bioelectrochemical systems. This occurs as a result of overpotentials occurring at the anode, membrane, and biocathode. The energy loss reduces efficiency significantly.[4][6][7] Another limitation is the biocathode. Because the biocathode is so important in electron exchange and methane formation, its make-up can have a dramatic effect on the efficiency of the reaction.[1][4] Efforts are being made to improve the biocathodes used in electromethanogenesis through combining new and existing materials, reshaping the materials, or applying different "pre-treatments" to the biocathode surface, thereby increasing biocompatibility.[4][6]
See also
- Bioelectrochemical reactor
- Electrochemical energy conversion
- Electrochemical engineering
- Electrochemical reduction of carbon dioxide
- Electrohydrogenesis
- Microbial fuel cell
- Photoelectrolysis
- Sabatier reaction
References
- ^ PMID 19544913.
- ^ Tuomas Kangasniemi (2009-04-07). "Aurinkosähkön varastoinnin ongelmat ohi: bakteeri syö sähköä, tekee metaania". Tekniikka & Talous (in Finnish). Archived from the original on 2011-07-17. Retrieved 2009-04-07.
- ^ "Researchers Show Direct Bacterial Production of Methane from Electricity and CO2". Green Car Congress. 30 March 2009. Retrieved 2009-04-09.
- ^ PMID 28425974.
- ^ ISSN 0360-3199.
- ^ PMID 27666730.
- ^ ISSN 1876-6102.
- ^ PMID 21983651.
- ^ Zhou, Huihui; Xing, Defeng; Xu, Mingyi; Angelidaki, Irini; Zhang, Yifeng (2019). "The Highest Methane Production Rate Ever by Electromethanogenesis Using Intact Anaerobic Granular Sludge as Biocathode".
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