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Improved Oxygen Evolution Activity of IrO2 by in situ Engineering of Ultra-Small Ir Sphere Shell Utilizing Pulse Laser

Abstract

Noble metal based catalysts are a vital branch of electrocatalysts for oxygen evolution reaction (OER), which is a half reaction of multiple renewable energy related reactions. To fully exploit their potential as an efficient OER catalyst, we develop a fast one-step strategy to engineer a unique nanostructure for the benchmark catalyst IrO2 utilizing ultra-fast pulse laser, through which a shell of ultra-small Ir spheres with a diameter of ca. 2 nm is in situ engineered around the IrO2 core. The creation of the Ir sphere shell not only increases the electrochemical surface area, but also improves the electrical conductivity of the electrocatalyst. The as-engineered IrO2@Ir architecture demonstrates an extremely high electrocatalytic activity towards the OER, revealing a overpotential of 255 mV at 10 mA cm-2 and Tafel slope of 45 mV dec-1, both are much lower than that observed for the unmodified one. Furthermore, the catalytic performance is the best among all the noble metal based OER catalysts. This work may open a new avenue to efficiently improve the catalytic activity of noble metal based catalysts, and significantly advances the development in the energy industry.

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Publication details

The article was received on 17 Dec 2018, accepted on 09 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR10163A
Citation: Nanoscale, 2019, Accepted Manuscript

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    Improved Oxygen Evolution Activity of IrO2 by in situ Engineering of Ultra-Small Ir Sphere Shell Utilizing Pulse Laser

    W. Zhong, Z. Lin, S. Feng, D. Wang, S. Shen, Q. Zhang, L. Gu, Z. Wang and B. Fang, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR10163A

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