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    Harnessing the Extracellular Electron Transfer Capability of Geobacter sulfurreducens for Ambient Synthesis of Stable Bifunctional Single-Atom Electrocatalyst for Water Splitting

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    Name:
    Pedireddy et al_Manuscript_adfm.202010916R1_Feb 2-2021-KAUST Repository.pdf
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    4.061Mb
    Format:
    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Pedireddy, Srikanth cc
    Jimenez Sandoval, Rodrigo J. cc
    Ravva, Mahesh Kumar
    Nayak, Chandrani
    Anjum, Dalaver H.
    Jha, Shambhu Nath
    Katuri, Krishna
    Saikaly, Pascal cc
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Division of Biological and Environmental Science and Engineering Water Desalination and Reuse Center King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia
    Environmental Biotechnology Research Group
    Environmental Science and Engineering Program
    KAUST Catalysis Center (KCC)
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    URF/1/2985-01-01
    Date
    2021-03-15
    Online Publication Date
    2021-03-15
    Print Publication Date
    2021-05
    Embargo End Date
    2022-03-15
    Submitted Date
    2021-02-03
    Permanent link to this record
    http://hdl.handle.net/10754/668243
    
    Metadata
    Show full item record
    Abstract
    Single-atom metal (SA-M) catalysts with high dispersion of active metal sites allow maximum atomic utilization. Conventional synthesis of SA-M catalysts involves high-temperature treatments, leading to low yield with a random distribution of atoms. Herein, a nature-based facile method to synthesize SA-M catalysts (M = Fe, Ir, Pt, Ru, Cu, or Pd) in a single step at ambient temperature, using the extracellular electron transfer capability of Geobacter sulfurreducens (GS), is presented. Interestingly, the SA-M is coordinated to three nitrogen atoms adopting an MN3 on the surface of GS. Dry samples of SA-Ir@GS without further heat treatment show exceptionally high activity for oxygen evolution reaction when compared to benchmark IrO2 catalyst and comparable hydrogen evolution reaction activity to commercial 10 wt% Pt/C. The SA-Ir@GS exhibits the best water-splitting performance compared to other SA-M@GS, showing a low applied potential of 1.65 V to achieve 10 mA cm−2 in 1.0 M KOH with cycling over 5 h. The density functional calculations reveal that the large adsorption energy of H2O and moderate adsorption energies of reactants and reaction intermediates for SA-Ir@GS favorably improve its activity. This synthesis method at room temperature provides a versatile platform for the preparation of SA-M catalysts for various applications by merely altering the metal precursors.
    Citation
    Pedireddy, S., Jimenez-Sandoval, R., Ravva, M. K., Nayak, C., Anjum, D. H., Jha, S. N., … Saikaly, P. E. (2021). Harnessing the Extracellular Electron Transfer Capability of Geobacter sulfurreducens for Ambient Synthesis of Stable Bifunctional Single-Atom Electrocatalyst for Water Splitting. Advanced Functional Materials, 2010916. doi:10.1002/adfm.202010916
    Sponsors
    This work was supported by Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology to P.E.S. The authors thank the synchrotron facility at the Raja Ramanna Centre for Advanced Technology (RRCAT), Indore, India. The authors are thankful to KAUST Supercomputing Core Lab.
    Publisher
    Wiley
    Journal
    Advanced Functional Materials
    DOI
    10.1002/adfm.202010916
    10.1002/adfm.202170161
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1002/adfm.202010916
    ae974a485f413a2113503eed53cd6c53
    10.1002/adfm.202010916
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; KAUST Catalysis Center (KCC); Water Desalination and Reuse Research Center (WDRC)

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