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This study quantitatively elucidates the role of metal clusters in the electrochemical activation of metal-oxide nanostructured electrodes. Through the deposition of nearly monodisperse AuxPt1–x (x = 0, 0.5, 1) clusters, smaller than 3 nm, on the ZnO nanorod (NR) electrode surface, a controlled enhancement of charge transfer and activation of electrocatalytic processes was achieved. The interfacial electrical states of the hybrid electrodes were probed by electrochemical impedance spectroscopy (EIS). Analysis of the charge-transfer resistance and interface capacitance, estimated by modeling EIS curves in different bias regimes, indicated the presence of a large amount of active donor states (∼1020 cm–3) at the surface of the ZnO NRs. Decoration of the ZnO NRs with AuxPt1–x clusters strongly increased the charge-transfer process at the cluster–ZnO/electrolyte interface. This induced a more effective depletion of …
American Chemical Society
Publication date: 
27 Jul 2017

Salvatore Cosentino, Giorgia Fiaschi, Vincenzina Strano, Kuo-juei Hu, Ting-Wei Liao, Nofar Mintz Hemed, Anupam Yadav, Salvo Mirabella, Didier Grandjean, Peter Lievens, Yosi Shacham-Diamand

Biblio References: 
Volume: 121 Issue: 29 Pages: 15644-15652
The Journal of Physical Chemistry C