Dissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline- Earth Iridates in Acid
- Dissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline- Earth Iridates in Acid
- 서호영; 송창우; 박주미; 배형빈; 정성윤
- electrocatalysis; iridium oxides; oxygen evolution reaction; scanning transmission electron microscopy; surface
- Issue Date
- VOL 5-3259
- 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
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