Dissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline-Earth Iridates in Acid

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Alkaline and alkaline-earth iridates have garnered much attention, as they can outperform traditional IrO2 for oxygen evolution electrocatalysis under acidic conditions. Despite the advantages of their catalytic properties and significant reduction of Ir utilization, dissolution of alkaline and alkaline-earth elements into acid media can be a serious drawback that may confine long-term applications. By using atomic-column-resolved scanning transmission electron microscopy, we demonstrate the surface variations of three alkaline-earth iridates, AIrO(3) (A = Sr or Ba). Directly identifying the structural transformation into metastable nanocrystallites or an amorphous state, we elucidate that substantial surface roughening can be induced by alkaline-earth elemental leaching. In particular, similar to 20-fold increases in the active surface area in pseudocubic SrIrO3 and monoclinic BaIrO3 are notable structural features. Our findings emphasize both the impact of surface structure on the overall catalytic activity and consequently the important control of chemical leaching to attain a high surface area in iridate-based catalysts.
Publisher
CELL PRESS
Issue Date
2019-12
Language
English
Article Type
Article
Citation

CHEM, v.5, no.12, pp.3243 - 3259

ISSN
2451-9294
DOI
10.1016/j.chempr.2019.10.011
URI
http://hdl.handle.net/10203/270923
Appears in Collection
EEW-Journal Papers(저널논문)
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