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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, Arumugam; Ganesan, Pandian; Estevez, Luis; Mcgrail, B. Peter; Motkuri, Radha Kishan; Shanmugam, Sangaraju
- DGIST Authors
- Shanmugam, Sangaraju
- Issue Date
- Advanced Energy Materials
- Article Type
- Article in Press
- Anodes; Cobalt; Crystalline materials; Doping (additives); Durability; Electrocatalysts; Electrodes; Electrolysis; Electrolytic cells; Fuel cells; Hydrogen; Iridium compounds; Nickel; Organometallics; Oxygen; Porous materials; Renewable energy resources; Core shell nano structures; Metal organic framework; Nano-carbon; Nanostructured electrocatalysts; Oxygen evolution activity; Prussian blue analogues; Renewable energy technologies; Water electrolysis; Shells (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
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- Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles
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