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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ArticleAuthors
Pedireddy, Srikanth
Jimenez Sandoval, Rodrigo J.

Ravva, Mahesh Kumar
Nayak, Chandrani
Anjum, Dalaver H.
Jha, Shambhu Nath
Katuri, Krishna
Saikaly, Pascal

KAUST Department
Biological and Environmental Science and Engineering (BESE) DivisionDivision 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/1/2985-01-01Date
2021-03-15Online Publication Date
2021-03-15Print Publication Date
2021-05Embargo End Date
2022-03-15Submitted Date
2021-02-03Permanent link to this record
http://hdl.handle.net/10754/668243
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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.202010916Sponsors
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
WileyJournal
Advanced Functional MaterialsAdditional Links
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202010916ae974a485f413a2113503eed53cd6c53
10.1002/adfm.202010916