Towards identifying the active sites on RuO2(110) in catalyzing oxygen evolution  

Reshma R. Rao, Manuel J. Kolb, Niels Bendtsen Halck, Anders Filsøe Pedersen, Apurva Mehta, Hoydoo You, Kelsey A. Stoerzinger, Zhenxing Feng, Heine Anton Hansen, Hua Zhou, Livia Giordano, Jan Rossmeisl, Tejs Vegge, Ib Chorkendorff, Ifan Stephens, Yang Shao-Horn

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Abstract

While the surface atomic structure of RuO2 has been well studied in ultra high vacuum, much less is known about the interaction between water and RuO2 in aqueous solution. In this work, in situ surface X-ray scattering measurements combined with density functional theory (DFT) were used to determine the surface structural changes on single-crystal RuO2(110) as a function of potential in acidic electrolyte. The redox peaks at 0.7, 1.1 and 1.4 V vs. reversible hydrogen electrode (RHE) could be attributed to surface transitions associated with the successive deprotonation of –H2O on the coordinatively unsaturated Ru sites (CUS) and hydrogen adsorbed to the bridging oxygen sites. At potentials relevant to the oxygen evolution reaction (OER), an –OO species on the Ru CUS sites was detected, which was stabilized by a neighboring –OH group on the Ru CUS or bridge site. Combining potential-dependent surface structures with their energetics from DFT led to a new OER pathway, where the deprotonation of the –OH group used to stabilize –OO was found to be rate-limiting.
Original languageEnglish
JournalEnergy & Environmental Science
Volume10
Issue number12
Pages (from-to)2626-2637
ISSN1754-5692
DOIs
Publication statusPublished - 2017

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