Bioinspired Synthesis of Reduced Graphene Oxide-Wrapped Geobacter sulfurreducens as a Hybrid Electrocatalyst for Efficient Oxygen Evolution Reaction

Shafeer Kalathil, Krishna P. Katuri, Amira S. Alazmi, Srikanth Pedireddy, Nikolay Kornienko, Pedro M. F. J. Costa, Pascal E. Saikaly

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)
12 Downloads (Pure)

Abstract

Doping/decorating of graphene or reduced graphene oxide (rGO) with heteroatoms provides a promising route for the development of electrocatalysts which will be 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 versus the reversible hydrogen electrode with a Tafel slope of 43 mV dec-1 and possesses high durability, as evidenced through 10 h of stability testing. Electrochemical analyses suggest the importance of Fe and its possible role as an active site for OER. Overall, this work represents a simple approach toward the development of an earth-abundant, eco-friendly, and highly active OER electrocatalyst for various applications such as solar fuel production, rechargeable metal-air batteries, and microbial electrosynthesis.
Original languageEnglish
Pages (from-to)3686-3693
Number of pages8
JournalChemistry of Materials
Volume31
Issue number10
Early online date17 Apr 2019
DOIs
Publication statusPublished - 28 May 2019
Externally publishedYes

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