Oxygen Reduction Reaction with Manganese Oxide Nanospheres in Microbial Fuel Cells

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dc.citation.firstpage11777
dc.citation.issueNumber14
dc.citation.journalTitleACS Omega
dc.citation.lastpage11787
dc.citation.volumeNumber7
dc.contributor.authorVemuri, Bhuvan
dc.contributor.authorChilkoor, Govinda
dc.contributor.authorDhungana, Pramod
dc.contributor.authorIslam, Jamil
dc.contributor.authorBaride, Aravind
dc.contributor.authorKoratkar, Nikhil
dc.contributor.authorAjayan, Pulickel M.
dc.contributor.authorRahman, Muhammad M.
dc.contributor.authorHoefelmeyer, James D.
dc.contributor.authorGadhamshetty, Venkataramana
dc.date.accessioned2022-04-28T14:29:03Z
dc.date.available2022-04-28T14:29:03Z
dc.date.issued2022
dc.description.abstractOperating microbial fuel cells (MFCs) under extreme pH conditions offers a substantial benefit. Acidic conditions suppress the growth of undesirable methanogens and increase redox potential for oxygen reduction reactions (ORRs), and alkaline conditions increase the electrocatalytic activity. However, operating any fuel cells, including MFCs, is difficult under such extreme pH conditions. Here, we demonstrate a pH-universal ORR ink based on hollow nanospheres of manganese oxide (h-Mn3O4) anchored with multiwalled carbon nanotubes (MWCNTs) on planar and porous forms of carbon electrodes in MFCs (pH = 3–11). Nanospheres of h-Mn3O4 (diameter ∼ 31 nm, shell thickness ∼ 7 nm) on a glassy carbon electrode yielded a highly reproducible ORR activity at pH 3 and 10, based on rotating disk electrode (RDE) tests. A phenomenal ORR performance and long-term stability (∼106 days) of the ink were also observed with four different porous cathodes (carbon cloth, carbon nanofoam paper, reticulated vitreous carbon, and graphite felt) in MFCs. The ink reduced the charge transfer resistance (Rct) to the ORR by 100-fold and 45-fold under the alkaline and acidic conditions, respectively. The current study promotes ORR activity and subsequently the MFC operations under a wide range of pH conditions, including acidic and basic conditions.
dc.identifier.citationVemuri, Bhuvan, Chilkoor, Govinda, Dhungana, Pramod, et al.. "Oxygen Reduction Reaction with Manganese Oxide Nanospheres in Microbial Fuel Cells." <i>ACS Omega,</i> 7, no. 14 (2022) American Chemical Society: 11777-11787. https://doi.org/10.1021/acsomega.1c06950.
dc.identifier.digitalacsomega-1c06950
dc.identifier.doihttps://doi.org/10.1021/acsomega.1c06950
dc.identifier.urihttps://hdl.handle.net/1911/112183
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleOxygen Reduction Reaction with Manganese Oxide Nanospheres in Microbial Fuel Cells
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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