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. 2024-01-19T16:01:39Z 2024-01-19T16:01:39Z 2022-01-10 2020-12 https://pubs.kist.re.kr/handle/201004/117722 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) English Cell Press Dopant-Assisted Control of the Crystallite Domain Size in Hollow Ternary Iridium Alloy Octahedral Nanocages toward the Oxygen Evolution Reaction Article 10.1016/j.xcrp.2020.100260 1 Cell Reports Physical Science, v.1, no.12 Cell Reports Physical Science 1 12 N scopus 000658758300004 2-s2.0-85100613817 Chemistry, Multidisciplinary Energy & Fuels Materials Science, Multidisciplinary Physics, Multidisciplinary Chemistry Energy & Fuels Materials Science Physics Article X-RAY-ABSORPTION OXIDE ELECTROCATALYSTS STRUCTURAL FEATURES WATER OXIDATION IR SURFACE NUCLEATION STABILITY EFFICIENT 1ST-PRINCIPLES crystallinity doping electrocatalyst grain size iridium-based alloy nanocage oxygen evolution reaction