Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy
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ArticleAuthors
Minguzzi, AlessandroMontagna, Linda
Falqui, Andrea

Vertova, Alberto
Rondinini, Sandra
Ghigna, Paolo
KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionBioscience Program
Date
2018-03-17Online Publication Date
2018-03-17Print Publication Date
2018-04Permanent link to this record
http://hdl.handle.net/10754/627363
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In this work we studied the kinetics of oxide formation and reduction on Pt nanoparticles in HClO4 in the absence and in the presence of Br− and Cl− ions. The study combines potential step methods (i.e. chronoamperometry and choronocoulometry) with energy dispersive X-ray absorption spectroscopy (ED-XAS), which in principle allows to record a complete XAS spectrum in the timescale of milliseconds. Here, the information on the charge state and on the atomic surrounding of the considered element provided by XAS was exploited to monitor the degree of occupancy of 5d states of Pt in the course of oxide formation and growth, and to elucidate the competing halide adsorption/desorption phenomena. Electrochemical methods and XAS agree on the validity of a log(t) depending growth of Pt oxide, that is significantly delayed in the presence of Cl− and Br− anions. In the proximity of formation of one monolayer, the growth is further slowed down.Citation
Minguzzi A, Montagna L, Falqui A, Vertova A, Rondinini S, et al. (2018) Dynamics of oxide growth on Pt nanoparticles electrodes in the presence of competing halides by operando energy dispersive X-Ray absorption spectroscopy. Electrochimica Acta. Available: http://dx.doi.org/10.1016/j.electacta.2018.03.092.Sponsors
We are grateful to Industrie De Nora S.p.A. for having supplied Pt nanoparticles deposited on carbon. The ESRF is kindly acknowledged for the provision of beamtime (Exp. CH-4951). We are grateful to Dr. Sara Morandi for her considerable help during data collection. We also acknowledge the ID24 beamline staff, and, in particular, Dr. Debora Motta Meira, for considerable help during data collection and analysis.Publisher
Elsevier BVJournal
Electrochimica ActaAdditional Links
http://www.sciencedirect.com/science/article/pii/S0013468618305942ae974a485f413a2113503eed53cd6c53
10.1016/j.electacta.2018.03.092