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Trends in Activity and Dissolution on RuO2 under Oxygen Evolution Conditions - Particles versus Well-Defined Extended Surfaces

Friday 14 Sep 18

Rutile RuO₂ catalysts are the most active pure metal oxides for oxygen evolution; however, they are also unstable toward dissolution. Herein, we study the catalytic activity and stability of oriented thin films of RuO₂ with (111), (101), and (001) orientations, in comparison to a (110) single crystal and commercial nanoparticles.

These surfaces were all tested in aqueous solutions of 0.05 M H₂SO₄. The initial catalyst activity ranked as follows: (001) > (101) > (111) ≈ (110). We complemented our activity data with inductively coupled plasma mass spectroscopy, to measure Ru dissolution products occurring in parallel to oxygen evolution. In contrast to earlier reports, we find that, under our experimental conditions, there is no correlation between the activity and stability.

Claudie Roy, Reshma R. Rao, Kelsey A. Stoerzinger, Jonathan Hwang, Jan Rossmeisl, Ib Chorkendorff, Yang Shao-Horn, and Ifan E. L. Stephens

ACS Energy Lett., 2018, 3 (9), pp 2045–2051

DOI: 10.1021/acsenergylett.8b01178

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