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A Stable Graphitic, Nanocarbon-Encapsulated, Cobalt-Rich Core-Shell Electrocatalyst as an Oxygen Electrode in a Water Electrolyzer

A Stable Graphitic, Nanocarbon-Encapsulated, Cobalt-Rich Core-Shell Electrocatalyst as an Oxygen Electrode in a Water Electrolyzer
Sivanantham, ArumugamGanesan, PandianEstevez, LuisMcgrail, B. PeterMotkuri, Radha KishanShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
Advanced Energy Materials, 8(14)
Article Type
AnodesCobaltCrystalline materialsDoping (additives)DurabilityElectrocatalystsElectrodesElectrolysisElectrolytic cellsFuel cellsHydrogenIridium compoundsNickelOrganometallicsOxygenPorous materialsRenewable energy resourcesCore shell nano structuresMetal organic frameworkNano-carbonNanostructured electrocatalystsOxygen evolution activityPrussian blue analoguesRenewable energy technologiesWater electrolysisShells (structures)
The oxygen electrode plays a vital role in the successful commercialization of renewable energy technologies, such as fuel cells and water electrolyzers. In this study, the Prussian blue analogue-derived nitrogen-doped nanocarbon (NC) layer-trapped, cobalt-rich, core-shell nanostructured electrocatalysts (core-shell Co at NC) are reported. The electrode exhibits an improved oxygen evolution activity and stability compared to that of the commercial noble electrodes. The core-shell Co at NC-loaded nickel foam exhibits a lower overpotential of 330 mV than that of IrO2 on nickel foam at 10 mA cm-2 and has a durability of over 400 h. The commercial Pt/C cathode-assisted, core-shell Co at NC-anode water electrolyzer delivers 10 mA cm-2 at a cell voltage of 1.59 V, which is 70 mV lower than that of the IrO2-anode water electrolyzer. Over the long-term chronopotentiometry durability testing, the IrO2-anode water electrolyzer shows a cell voltage loss of 230 mV (14%) at 95 h, but the loss of the core-shell Co at NC-anode electrolyzer is only 60 mV (4%) even after 350 h cell-operation. The findings indicate that the Prussian blue analogue is a class of inorganic nanoporous materials that can be used to derive metal-rich, core-shell electrocatalysts with enriched active centers. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Wiley-VCH Verlag
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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