Sub-10-nm-sized Au@AuxIr1−x metal-core/alloy-shell nanoparticles as highly durable catalysts for acidic water splitting.

Autor:	Wang, Huimin, Chen, Zhe-ning, Wang, Yuanyuan, Wu, Dongshuang, Cao, Minna, Sun, Fanfei, Cao, Rong
Předmět:	OXYGEN evolution reactions CATALYSTS ELECTRON density DENSITY functional theory TRANSITION metal catalysts BINDING energy
Zdroj:	National Science Review; Apr2024, Vol. 11 Issue 4, p1-11, 11p
Abstrakt:	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). [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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