Exoelectrogenic biofilm as a template for sustainable formation of a catalytic mesoporous structure

Handle URI:
http://hdl.handle.net/10754/598275
Title:
Exoelectrogenic biofilm as a template for sustainable formation of a catalytic mesoporous structure
Authors:
Yates, Matthew D.; Cusick, Roland D.; Ivanov, Ivan; Logan, Bruce E.
Abstract:
© 2014 Wiley Periodicals, Inc. Actively respiring biofilms of Geobacter sulfurreducens were used as a biotemplate to form a palladium mesoporous layer directly on an electrode surface. Cells and proteins within the biofilm acted as the reductant and stabilizer to facilitate the reduction, dispersion, and attachment of palladium nanoparticles to the electrode surface without using synthetic chemicals. © 2014 Wiley Periodicals, Inc. Mesoporous structures can increase catalytic activity by maximizing the ratio of surface area to volume, but current synthesis techniques utilize expensive polymers and toxic chemicals. A Geobacter sulfurreducens biofilm was used as a sustainable template to form mesoporous Pd structures while eliminating the need for synthetic chemicals. The bulk of the biofilm material was removed by thermal treatments after nanoparticle formation, producing a catalytic Pd mesoporous (pore size 9.7±0.1nm) structure attached to the graphite electrode with a 1.5-2μm thick backbone composed of nanoparticles (~200nm). A control electrode electrochemically plated with Pd in the absence of a biofilm exhibited a variable planar Pd base (~0.5-3μm thick) with sporadic Pd extrusions (~2μm across, 1-5μm tall) from the surface. The biotemplated mesoporous structure produced 15-20% higher stable current densities during H2 oxidation tests than the electrochemically plated control electrode, even though 30% less Pd was present in the biotemplated catalyst. These results indicate that electroactive biofilms can be used as a sustainable base material to produce nanoporous structures without the need for synthetic polymers. Biotechnol. Bioeng. 2014;111: 2349-2354.
Citation:
Yates MD, Cusick RD, Ivanov I, Logan BE (2014) Exoelectrogenic biofilm as a template for sustainable formation of a catalytic mesoporous structure. Biotechnology and Bioengineering 111: 2349–2354. Available: http://dx.doi.org/10.1002/bit.25267.
Publisher:
Wiley-Blackwell
Journal:
Biotechnology and Bioengineering
Issue Date:
4-Jun-2014
DOI:
10.1002/bit.25267
PubMed ID:
24771104
Type:
Article
ISSN:
0006-3592
Sponsors:
Contract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant sponsor: National Science Foundation (NSF) Graduate Research Fellowship Program
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorYates, Matthew D.en
dc.contributor.authorCusick, Roland D.en
dc.contributor.authorIvanov, Ivanen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:17:49Zen
dc.date.available2016-02-25T13:17:49Zen
dc.date.issued2014-06-04en
dc.identifier.citationYates MD, Cusick RD, Ivanov I, Logan BE (2014) Exoelectrogenic biofilm as a template for sustainable formation of a catalytic mesoporous structure. Biotechnology and Bioengineering 111: 2349–2354. Available: http://dx.doi.org/10.1002/bit.25267.en
dc.identifier.issn0006-3592en
dc.identifier.pmid24771104en
dc.identifier.doi10.1002/bit.25267en
dc.identifier.urihttp://hdl.handle.net/10754/598275en
dc.description.abstract© 2014 Wiley Periodicals, Inc. Actively respiring biofilms of Geobacter sulfurreducens were used as a biotemplate to form a palladium mesoporous layer directly on an electrode surface. Cells and proteins within the biofilm acted as the reductant and stabilizer to facilitate the reduction, dispersion, and attachment of palladium nanoparticles to the electrode surface without using synthetic chemicals. © 2014 Wiley Periodicals, Inc. Mesoporous structures can increase catalytic activity by maximizing the ratio of surface area to volume, but current synthesis techniques utilize expensive polymers and toxic chemicals. A Geobacter sulfurreducens biofilm was used as a sustainable template to form mesoporous Pd structures while eliminating the need for synthetic chemicals. The bulk of the biofilm material was removed by thermal treatments after nanoparticle formation, producing a catalytic Pd mesoporous (pore size 9.7±0.1nm) structure attached to the graphite electrode with a 1.5-2μm thick backbone composed of nanoparticles (~200nm). A control electrode electrochemically plated with Pd in the absence of a biofilm exhibited a variable planar Pd base (~0.5-3μm thick) with sporadic Pd extrusions (~2μm across, 1-5μm tall) from the surface. The biotemplated mesoporous structure produced 15-20% higher stable current densities during H2 oxidation tests than the electrochemically plated control electrode, even though 30% less Pd was present in the biotemplated catalyst. These results indicate that electroactive biofilms can be used as a sustainable base material to produce nanoporous structures without the need for synthetic polymers. Biotechnol. Bioeng. 2014;111: 2349-2354.en
dc.description.sponsorshipContract grant sponsor: King Abdullah University of Science and Technology (KAUST)Contract grant sponsor: National Science Foundation (NSF) Graduate Research Fellowship Programen
dc.publisherWiley-Blackwellen
dc.subjectBiotemplateen
dc.subjectCatalyticen
dc.subjectExoelectrogenicen
dc.subjectMesoporousen
dc.titleExoelectrogenic biofilm as a template for sustainable formation of a catalytic mesoporous structureen
dc.typeArticleen
dc.identifier.journalBiotechnology and Bioengineeringen
dc.contributor.institutionDepartment of Civil and Environmental Engineering; Pennsylvania State University; 212 Sackett Building University Park Pennsylvania 16802en

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