Authors
Xuemin Cao, Han Cheng, Renjie Gui, Huijuan Zhang, Caijie Su, Chen Chen, Yifan Yin, Yi Tan, Huijuan Wang, Wangsheng Chu, Yue Lin, Gongming Wang, Yi Xie, Changzheng Wu
Published in
Angewandte Chemie (International ed. in English). Pages e202509993. Jul 08, 2025. Epub Jul 08, 2025.
Abstract
The synthesis of sub-nanoscale noble metal catalysts is pivotal for enhancing electrocatalytic performance, yet achieving precise control over particle size at this scale remains a critical challenge. In this work, we propose a hierarchical confinement strategy which combines spatial confinement at nanoscale and anchoring confinement at atomic scale, to overcome the size limitations imposed by high-temperature sintering. Using this strategy, a series of uniformly sized (~1 nm) Ir-based alloy clusters, including IrMn, IrFe, IrCo, and IrNi, are successfully fabricated. The synthesized sub-nanoscale IrCo alloy clusters (denoted as sub-IrCo cluster) demonstrate exceptional oxygen evolution reaction (OER) catalytic performance, with an ultralow overpotential of 210 mV at 10 mA/cm² and a remarkable mass activity 87.5 times greater than that of commercial IrO2. Density functional theory (DFT) and molecular dynamics (MD) simulations reveal that the incorporation of N enhances the interaction between Ir atoms and the support, which inhibits particle agglomeration. This work provides an effective strategy for preventing particle sintering via a hierarchical confinement effect and achieves precise size control at sub-nanoscale, opening a new avenue for the development of efficient noble metal catalysts with high atomic utilization.
PMID:
40627698
Bibliographic data and abstract were imported from PubMed on 09 Jul 2025.
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