Suppressing buoyant force: New avenue for long-term durability of oxygen evolution catalysts

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Recent progress in the development of water oxidation electrocatalysts has mainly focused on achieving high performance in a single measurement, while the importance of durability has not yet been deeply studied. Additionally, oxygen evolution reaction (OER) involves a phase transition from a liquid to a gas, and thus, the removal of the generated oxygen bubble is an important factor for improving the activity or maintaining the performance. In this study, 3D ordered nanoporous nickel electrode is synthesized with a thickness of 5 mu m by using a templating method composed of proximity field nanopatterning (PnP) and electrodeposition followed by introduction of NiFe(OH)(2) on the nickel electrode to increase the OER activity. The unique nanopore array structure of the electrode has advantages of not only an enlarged active surface area but also the fast removal of oxygen bubbles by spatial confinement effect. Consequently, the NiFe-decorated 3D ordered nanoporous nickel electrode shows a highly efficient oxygen-evolving ability with a turnover frequency of 2.9 s(-1) and an ultralong durability of 300 h.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-12
Language
English
Article Type
Article
Citation

NANO ENERGY, v.54, pp.184 - 191

ISSN
2211-2855
DOI
10.1016/j.nanoen.2018.10.009
URI
http://hdl.handle.net/10203/248251
Appears in Collection
MS-Journal Papers(저널논문)
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