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

Title
A Stable Graphitic, Nanocarbon-Encapsulated, Cobalt-Rich Core-Shell Electrocatalyst as an Oxygen Electrode in a Water Electrolyzer
Authors
Sivanantham, ArumugamGanesan, PandianEstevez, LuisMcgrail, B. PeterMotkuri, Radha KishanShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
ACCEPT
Citation
Advanced Energy Materials
Type
Article
Article Type
Article in Press
Keywords
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)
ISSN
1614-6832
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/5770
DOI
10.1002/aenm.201702838
Publisher
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
Files:
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Collection:
Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles


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