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

Title
Dissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline- Earth Iridates in Acid
Authors
서호영송창우박주미배형빈정성윤
Keywords
electrocatalysis; iridium oxides; oxygen evolution reaction; scanning transmission electron microscopy; surface
Issue Date
2019-12
Publisher
Chem
Citation
VOL 5-3259
Abstract
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 seriousdrawback thatmay confine long-termapplications.By using atomic-column-resolved scanning transmission electron microscopy, we demonstrate the surface variations of three alkaline-earth iridates, AIrO3 (A = Sr or Ba). Directly identifying the structural transformation intometastable nanocrystallites or an amorphous state, we elucidate that substantial surface roughening can be induced by alkaline-earth elemental leaching. In particular, 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
URI
http://pubs.kist.re.kr/handle/201004/70833
ISSN
2451-9294
Appears in Collections:
KIST Publication > Article
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