Co-catalysis is promising approach towards enhancing activity of heterogeneous and homogeneous electrocatalysts. We report such synergic catalysis involving organic xanthylium-based catalyst, Xan2+, and oxides formed on the electrode surface. The oxygen evolution reaction (OER) was observed on working electrodes such as gold, platinum, glassy carbon, and boron-doped diamond, while some electrodes (titanium and fluorine-doped tinoxide) exhibited no OER activity. Based on experimental data supported by previously reported calculations, we propose a mechanism in which oxidized Xan2+ activates electrode surfacetowards the rate-determining O-O bond formation. In light of our findings, efficient OER electrocatalysis can be achieved using materials that strongly bind oxygen species and electron-deficient organic cations. This work has implications for energy storage systems that utilize OER.
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Zoric, M. R., Kadel, U. P., & Glusac, K. D. (2018). Cocatalysis: Role of Organic Cations in Oxygen Evolution Reaction on Oxide Electrodes. Acs Applied Materials & Interfaces, 10(32), 26825-26829. doi:10.1021/acsami.8b10232