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Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies

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Velasco Vélez,  Juan
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion , Stiftstr. 34 - 36 45470 Mülheim an der Ruhr, Germany;

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Jones,  Travis
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Streibel,  Verena
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion , Stiftstr. 34 - 36 45470 Mülheim an der Ruhr, Germany;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Velasco Vélez, J., Jones, T., Streibel, V., Hävecker, M., Chuang, C.-H., Frevel, L., et al. (2019). Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies. Surface Science, 681, 1-8. doi:10.1016/j.susc.2018.10.021.


Cite as: https://hdl.handle.net/21.11116/0000-0002-D0AA-3
Abstract
An electrode for the oxygen evolution reaction based on a conductive bi-layered free standing graphene support functionalized with iridium nanoparticles was fabricated and characterized by means of potentiometric and advanced X-ray spectroscopic techniques. It was found that the electrocatalytic activity of iridium nanoparticles is associated to the formation of Ir 5d electron holes. Strong Ir 5d and O 2p hybridization, however, leads to a concomitant increase O 2p hole character, making oxygen electron deficient and susceptible to nucleophilic attack by water. Consequently, more efficient electrocatalysts can be synthesized by increasing the number of electron-holes shared between the metal d and oxygen 2p.