Orientation-Dependent Oxygen Evolution on RuO2 without Lattice Exchange

Kelsey A. Stoerzinger, Oscar Diaz-Morales, Manuel Kolb, Reshma R. Rao, Rasmus Frydendal, Liang Qiao, Xiao Renshaw Wang, Niels Bendtsen Halck, Jan Rossmeisl, Heine Anton Hansen, Tejs Vegge, Ifan E. L. Stephens, Marc T. M. Koper, Yang Shao-Horn

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Abstract

RuO2 catalysts exhibit record activities toward the oxygen evolution reaction (OER), which is crucial to enable efficient and sustainable energy storage. Here we examine the RuO2 OER kinetics on rutile (110), (100), (101), and (111) orientations, finding (100) the most active. We assess the potential involvement of lattice oxygen in the OER mechanism with online electrochemical mass spectrometry, which showed no evidence of oxygen exchange on these oriented facets in acidic or basic electrolytes. Similar results were obtained for polyoriented RuO2 films and particles, in contrast to previous work, suggesting lattice oxygen is not exchanged in catalyzing OER on crystalline RuO2 surfaces. This hypothesis is supported by the correlation of activity with the number of active Ru-sites calculated by density functional theory, where more active facets bind oxygen more weakly. This new understanding of the active sites provides a design strategy to enhance the OER activity of RuO2 nanoparticles by facet engineering.
Original languageEnglish
JournalACS Energy Letters
Volume2
Issue number4
Pages (from-to)876-881
DOIs
Publication statusPublished - 2017

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