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Dopant-Assisted Control of the Crystallite Domain Size in Hollow Ternary Iridium Alloy Octahedral Nanocages toward the Oxygen Evolution Reaction

Authors
Kwon, T.Jun, M.Bang, G.J.Yang, H.Joo, J.Kim, T.Kim, J.Kim, J.M.Baik, H.Jung, Y.Kim, J.Y.Lee, K.
Issue Date
12월-2020
Publisher
Cell Press
Keywords
crystallinity; doping; electrocatalyst; grain size; iridium-based alloy; nanocage; oxygen evolution reaction
Citation
Cell Reports Physical Science, v.1, no.12
Indexed
SCOPUS
Journal Title
Cell Reports Physical Science
Volume
1
Number
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/60781
DOI
10.1016/j.xcrp.2020.100260
ISSN
2666-3864
Abstract
Kwon et al. demonstrate that the structural evolution of Ir-oxide nanocatalysts during OER depends on the crystallinity of the precursor Ir-alloy nanostructures. The loosely knit IrO2@amorphous-IrOx structure, derived from the polycrystalline ternary Ir-alloy nanocage, exhibits high OER activity as well as long-term stability. © 2020 The Author(s)The dissolution of Ir-oxide-based catalysts remains a roadblock in the development of durable electrocatalytic oxygen evolution reaction (OER) catalysts. Both the activity and stability of Ir-based catalysts are critically dependent on the ratio of stable rutile IrO2 and unstable amorphous Ir oxide (a-IrOx), as well as the spatial relationship between them. Here, we report that the domain size in hollow ternary Ir alloy nanocages can be fine-tuned by the introduction of dopant elements during the growth of parent core-shell nanoparticles, Cu@CuIr. After electrochemical oxidation under OER conditions, Ir alloy nanocages possessing multiple crystallites in their structure are transformed into hollow aggregates of loosely knit crystalline IrO2@a-IrOx domains, whereas single-crystalline Ir alloy nanocages are transformed to hollow Ir oxides with a random mixture of a-IrOx and IrO2. The loosely knit IrO2@a-IrOx structure achieves high OER activity and long-term stability, which is not feasible with the random mixture of a-IrOx and IrO2. © 2020 The Author(s)
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