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- Title
Sub-10-nm-sized Au@AuxIr1−x metal-core/alloy-shell nanoparticles as highly durable catalysts for acidic water splitting.
- Authors
Wang, Huimin; Chen, Zhe-ning; Wang, Yuanyuan; Wu, Dongshuang; Cao, Minna; Sun, Fanfei; Cao, Rong
- Abstract
The absence of efficient and durable catalysts for oxygen evolution reaction (OER) is the main obstacle to hydrogen production through water splitting in an acidic electrolyte. Here, we report a controllable synthesis method of surface IrO x with changing Au/Ir compositions by constructing a range of sub-10-nm-sized core-shell nanocatalysts composed of an Au core and Au x Ir1−x alloy shell. In particular, Au@Au0.43Ir0.57 exhibits 4.5 times higher intrinsic OER activity than that of the commercial Ir/C. Synchrotron X-ray-based spectroscopies, electron microscopy and density functional theory calculations revealed a balanced binding of reaction intermediates with enhanced activity. The water-splitting cell using a load of 0.02 mgIr/cm2 of Au@Au0.43Ir0.57 as both anode and cathode can reach 10 mA/cm2 at 1.52 V and maintain activity for at least 194 h, which is better than the cell using the commercial couple Ir/C‖Pt/C (1.63 V, 0.2 h).
- Subjects
OXYGEN evolution reactions; CATALYSTS; ELECTRON density; DENSITY functional theory; TRANSITION metal catalysts; BINDING energy
- Publication
National Science Review, 2024, Vol 11, Issue 4, p1
- ISSN
2095-5138
- Publication type
Article
- DOI
10.1093/nsr/nwae056