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dc.contributor.authorKalathil, Shafeer
dc.contributor.authorKaturi, Krishna
dc.contributor.authorSaikaly, Pascal
dc.date.accessioned2020-10-29T07:49:03Z
dc.date.available2020-10-29T07:49:03Z
dc.date.issued2020
dc.date.submitted2019-12-20
dc.identifier.citationKalathil, S., Katuri, K. P., & Saikaly, P. E. (2020). Synthesis of an amorphous Geobacter-manganese oxide biohybrid as an efficient water oxidation catalyst. Green Chemistry, 22(17), 5610–5618. doi:10.1039/c9gc04353e
dc.identifier.issn1463-9270
dc.identifier.issn1463-9262
dc.identifier.doi10.1039/c9gc04353e
dc.identifier.urihttp://hdl.handle.net/10754/665702
dc.description.abstractThe development of a low cost and efficient oxygen evolution reaction (OER) catalyst has paramount importance to meet the future sustainable energy demand. Nature's photosynthetic machinery deploy manganese-based complex in the photosystem II to oxidize water. Inspired by nature, herein, we synthesized a high performing manganese-based OER catalyst using an electrochemically active and iron-rich bacterium, Geobacter sulfurreducens. The as-synthesized biohybrid catalyst (amorphous Geobacter-Mn2O3) produced a current density of 10 mA cm-2at an overpotential of 290 ± 9 mV versus a reversible hydrogen electrode with a low Tafel slope of 59 mV dec-1. The catalyst exhibited remarkable stability, evidenced through a long-term chronopotentiometry experiment. Multiple evidence showed that G. sulfurreducens contributed OER active elements (iron and phosphorus) to the biohybrid catalyst, and the as-synthesized Geobacter-Mn2O3is amorphous. The amorphous structure of the biohybrid catalyst provided a large electrochemically active surface area and excess catalytic sites for the OER catalysis. In addition, Mn3+present in the biohybrid catalyst is believed to be the precursor for oxygen evolution. The OER activity of the biohybrid catalyst outperformed commercial-Mn2O3, commercial-IrO2and most of the benchmark precious OER catalysts, thus supporting its suitability for large-scale applications. The proposed green approach to synthesize a biohybrid catalyst paves a new avenue to develop robust and cost-effective electrocatalysts for energy-related applications.
dc.description.sponsorshipThis work was supported by Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology (KAUST).
dc.publisherRoyal Society of Chemistry (RSC)
dc.relation.urlhttp://xlink.rsc.org/?DOI=C9GC04353E
dc.rightsThis article is open access licensed under a Creative Commons Attribution 3.0 Unported Licence.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.titleSynthesis of an amorphous: Geobacter-manganese oxide biohybrid as an efficient water oxidation catalyst
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Biotechnology Research Group
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalGreen Chemistry
dc.eprint.versionPublisher's Version/PDF
dc.identifier.volume22
dc.identifier.issue17
dc.identifier.pages5610-5618
kaust.personKalathil, Shafeer
kaust.personKaturi, Krishna
kaust.personSaikaly, Pascal
kaust.grant.numberURF/1/2985-01-01
dc.date.accepted2020-04-24
dc.identifier.eid2-s2.0-85092721744
refterms.dateFOA2020-10-29T07:50:13Z
kaust.acknowledged.supportUnitCompetitive Research


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