Ultrathin IrO2 Nanoneedles for Electrochemical Water Oxidation

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Electrochemical water splitting is promising for utilizing intermittent renewable energy. The sluggish kinetics of the oxygen evolution reaction (OER), however, is a bottleneck in obtaining high efficiency. Only a few OER electrocatalysts have been developed for the use in acidic media despite the importance of a proton exchange membrane (PEM) water electrolyzer. IrO2 is the only material that is both active and stable for the OER in highly corrosive acidic conditions. Herein, a facile and scalable synthesis of ultrathin IrO2 nanoneedles is reported with a diameter of 2 nm using a modified molten salt method. The activity and durability for the OER are significantly enhanced on the ultrathin IrO2 nanoneedles, compared to conventional nanoparticles. The ultrathin nanoneedles are successfully introduced to a PEM electrolyzer single cell with the enhanced cell performance.
Publisher
Wiely
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

OXYGEN EVOLUTION REACTION; ENHANCED ELECTROCATALYTIC ACTIVITY; METAL-OXIDE NANOCRYSTALS; MOLTEN-SALT SYNTHESIS; HIGHLY EFFICIENT; FUEL-CELLS; CATALYST; NANORODS; NANOWIRES; NANOSTRUCTURES

Citation

Advanced Functional Materials, v.28, no.4

ISSN
1616-301X
DOI
10.1002/adfm.201704796
URI
http://hdl.handle.net/10203/240404
Appears in Collection
CBE-Journal Papers(저널논문)
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