Abstract
Pd1ML/Pt(111) and Pd16ML/Pt(111) electrodes were prepared and studied by cyclic voltammetry in both acidic and alkaline electrolytes. Regardless of the electrolyte pH, hydrogen insertion/disinsertion was observed for the Pd16ML/Pt(111) electrode and absent for the Pd1ML/Pt(111) electrode. In the former case (Pd16ML/Pt(111) electrode), hydrogen insertion/disinsertion proceed at different kinetics in acidic and alkaline media, the kinetics being slower in alkaline versus acidic medium. On the contrary, similar rates of insertion/disinsertion of hydrogen were measured at the two pH values (H/Pd ≈ 0.45), demonstrating that the thermodynamics of hydrogen insertion is not depending on the electrolyte pH.
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Acknowledgments
This work has been financially supported by the CAPES (project 728714-3). Marian Chatenet thanks the French University Institute (IUF) for its support.
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Oliveira, V.L., Sibert, E., Soldo-Olivier, Y. et al. Insertion/Disinsertion of Hydrogen in Tailored Pd Layers Deposited on Pt(111) Surface in Alkaline and Acidic Medium. Electrocatalysis 9, 258–263 (2018). https://doi.org/10.1007/s12678-017-0414-6
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DOI: https://doi.org/10.1007/s12678-017-0414-6