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Nanostructured core-shell cobalt chalcogenides for efficient water oxidation in alkaline electrolyte

Nanostructured core-shell cobalt chalcogenides for efficient water oxidation in alkaline electrolyte
Sivanantham, ArumugamHyun, SuyeonSon, MinhoShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
Electrochimica Acta, 312, 234-241
Article Type
Author Keyword
Carbon-coating; Cobalt-chalcogenides; Electrocatalysts; Oxygen evolution reaction; Water splitting
Chalcogenides; Coatings; Current density; Electrocatalysts; Electrolysis; High current densities; Nanostructure formation; Oxygen evolution reaction; Solid state thermolysis; Water splitting; Cobalt compounds; Electrolytes; Potassium hydroxide; Reaction kinetics; Shells (structures); Sulfur compounds; Carbon coating; Electrochemical active surface areas; Electrolyte conditions
In water splitting, oxygen evolution reaction (OER) requires most active and stable electrocatalysts to overcome their sluggish kinetics thereby improving the device efficiency. In this research work, we developed nanocarbon protected cobalt sulfide, selenide and telluride (core-shell Co 9 S 8 @NC, CoSe@NC and CoTe@NC) using solvent and catalyst free auto-pressurized (Swagelok) solid-state thermolysis method and introduced as active and stable OER electrocatalysts in alkaline electrolyte. In 1 M KOH aqueous solution, the nickel foam supported Co 9 S 8 @NC shows the highest OER activity with an overpotential of 288 mV at 10 mA cm −2 , which is 33 and 68 mV lower than that of CoSe@NC and CoTe@NC electrocatalysts, respectively. In addition, the Co 9 S 8 @NC exhibits small Tafel slope of 65 mV dec −1 calculated from the low current density region (10 mA cm −2 ) and increases to 120 mV dec −1 at high current densities region (100 mA cm −2 ). All three electrocatalysts show good stability with negligible potential loss at a static OER current density of 10 mA cm −2 . The obtained results with electrochemical active surface area revealed that the thin carbon layer coating controls nanostructure formation together with liable utilization and strong protection of active sites from the harsh electrolyte conditions, thereby providing constructive activity and stability. © 2019 Elsevier Ltd
Elsevier Ltd
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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