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    Bio-inspired synthesis of reduced graphene oxide wrapped Geobacter sulfurreducens as a hybrid electrocatalyst for efficient oxygen evolution reaction

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    Name:
    acs.chemmater.9b00394.pdf
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    PDF
    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Kalathil, Shafeer
    Katuri, Krishna
    Alazmi, Amira
    Pedireddy, Srikanth cc
    Kornienko, Nikolay
    Da Costa, Pedro M. F. J. cc
    Saikaly, Pascal cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Science Program
    Environmental Biotechnology Research Group
    Environmental Science and Engineering Program
    KAUST Catalysis Center (KCC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    URF/1/2985-01-01
    Date
    2019-04-17
    Online Publication Date
    2019-04-17
    Print Publication Date
    2019-05-28
    Permanent link to this record
    http://hdl.handle.net/10754/631993
    
    Metadata
    Show full item record
    Abstract
    Doping/decorating of graphene or reduced graphene oxide (rGO) with heteroatoms provides a promising route for the development of electrocatalysts useful in many technologies, including water splitting. However, current doping approaches are complicated, not eco-friendly and not cost-effective. Herein, we report the synthesis of doped/decorated rGO for oxygen evolution reaction (OER) using a simple approach that is cost-effective, sustainable and easy to scale up. The OER catalyst was derived from the reduction of GO by an exo-electron transferring bacterium, Geobacter sulfurreducens. Various analytical tools indicate that OER active elements such as Fe, Cu, N, P, and S decorate the rGO flakes. The hybrid catalyst (i.e., Geobacter/rGO) produces a geometric current density of 10 mA cm−2 at an overpotential of 270 mV vs. the reversible hydrogen electrode (RHE) with a Tafel slope of 43 mV dec−1, and possesses high durability, evidenced through 10 hours of stability testing. Electrochemical analyses suggest the importance of Fe and its possible role as active site for OER. Overall, this work represents a simple approach towards the development of earth-abundant, eco-friendly and highly active OER electrocatalyst for various applications such as solar fuel production, rechargeable metal-air batteries, and microbial electrosynthesis.
    Citation
    Kalathil S, Katuri KP, Alazmi AS, Pedireddy S, Kornienko N, et al. (2019) Bio-inspired synthesis of reduced graphene oxide wrapped Geobacter sulfurreducens as a hybrid electrocatalyst for efficient oxygen evolution reaction. Chemistry of Materials. Available: http://dx.doi.org/10.1021/acs.chemmater.9b00394.
    Sponsors
    This work was supported by Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Chemical Society (ACS)
    Journal
    Chemistry of Materials
    DOI
    10.1021/acs.chemmater.9b00394
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.chemmater.9b00394
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.chemmater.9b00394
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC); Water Desalination and Reuse Research Center (WDRC)

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