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

doi:10.1002/aenm.201702838

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

Journal Article · 11 January 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201702838· OSTI ID:1439684

Sivanantham, Arumugam ^[1]; Ganesan, Pandian ^[1]; Estevez, Luis ^[2]; McGrail, B. Peter ^[2]; Motkuri, Radha Kishan ^[2]; ^[1]

Department of Energy Science & Engineering, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988 Republic of Korea
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland WA 99354 USA

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@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@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@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@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.

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1439684

Report Number(s):: PNNL-SA-127978; GT0200000

Journal Information:: Advanced Energy Materials, Vol. 8, Issue 14; ISSN 1614-6832

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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