Chemistry

Tailoring the active site for the oxygen evolution reaction on a Pt electrode

K. Iizuka, T. Kumeda, et al.

This groundbreaking study explores highly active electrocatalysts for the oxygen evolution reaction (OER) on single-crystal Pt electrodes, demonstrating how potential cycles can amplify OER activity by creating atomic-sized vacancies. Conducted by Kazuki Iizuka and colleagues, the research uncovers the intricate mechanisms behind enhanced efficiency in water electrolysis.

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Abstract

Highly active electrocatalysts for the oxygen evolution reaction (OER) are crucial for improving water electrolysis efficiency. This study examines OER active sites on single-crystal Pt electrodes, revealing that repeated oxidative/reductive potential cycles significantly enhance OER activity on Pt(111), particularly with wider (111) terraces. This activation stems from atomic-sized vacancies created by Pt(111) oxidation/reduction, identified through X-ray diffraction as defects in the second subsurface Pt layer. Bowl-shaped surface roughening, with high-coordination-number Pt atoms at cavity bottoms, further activates the OER.

Publisher

Communications Chemistry

Published On

Oct 13, 2022

Authors

Kazuki Iizuka, Tomoaki Kumeda, Kota Suzuki, Hiroo Tajiri, Osami Sakata, Nagahiro Hoshi, Masashi Nakamura

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