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Cobalt Sulfide Nanoparticles Grown on Nitrogen and Sulfur Codoped Graphene Oxide: An Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions

Cobalt Sulfide Nanoparticles Grown on Nitrogen and Sulfur Codoped Graphene Oxide: An Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions
Ganesan, PandianPrabu, MoniSanetuntikul, JakkidShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
ACS Catalysis, 5(6), 3625-3637
Article Type
Co-DopingCobaltCobalt SulfideElectrocatalystsElectrodesElectrolytic ReductionFuel CellsGrapheneGraphene OxideGraphene OxidesIridiumNanoparticlesNitrogenNitrogen and Sulfur CodopingOxygenOxygen ElectrodeOxygen Reduction and Evolution ReactionsParticle SizeReductionReversible Hydrogen ElectrodesSecondary BatteriesSulfurSulfur CompoundsTransition-Metals CompoundsWater OxidationX-Ray Diffraction StudiesX-Ray Photoelectron Spectroscopy StudiesX Ray DiffractionX Ray Photoelectron Spectroscopy
Electrochemical oxygen evolution and reduction reactions have received great attention due to their importance in several key technologies such as fuel cells, electrolyzers, and metal-air batteries. Here, we present a simple approach to the preparation of cobalt sulfide nanoparticles in situ grown on a nitrogen and sulfur codoped graphene oxide surface. The particle size and phase were controlled by changing the treatment temperature. Cobalt sulfide nanoparticles dispersed on graphene oxide hybrids were successfully prepared by a solid-state thermolysis approach at different temperatures (400, 500, and 600 °C) using cobalt thiourea and graphene oxide. X-ray diffraction studies revealed that hybrids prepared at 400 and 500 °C result in pure CoS2 phase, whereas the hybrid prepared at 600 °C exhibits Co9S8 phase. X-ray photoelectron spectroscopy studies revealed that nitrogen and sulfur simultaneously codoped on the graphene oxide surface, and these sites act to anchor the CoS2 nanoparticles strongly on the GO surface. The strong coupling between CoS2 and N,S-GO was reflected in the improvement of the oxygen electrode potential. CoS2(400)/N,S-GO showed an outstanding oxygen electrode activity with a potential of about 0.82 V against a reversible hydrogen electrode in alkaline medium, which is far better than the performance of precious catalysts such as Pt/C (1.16 V), Ru/C (1.01 V), and Ir/C (0.92 V). © 2015 American Chemical Society.
American Chemical Society
Related Researcher
  • Author Shanmugam, Sangaraju Advanced Energy Materials Laboratory
  • Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles

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