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Hydrogen Interaction (Electrosorption and Evolution) Characteristics of Pd and Pd3Co Alloy Nanoparticles: An In-situ Investigation with Electrochemical Impedance Spectroscopy.
- Source :
-
Electrochimica Acta . Mar2016, Vol. 194, p199-210. 12p. - Publication Year :
- 2016
-
Abstract
- Electrochemical impedance spectroscopy (EIS) and voltammetry are used to investigate the interaction of hydrogen with Pd and Pd 3 Co nanoparticles supported on a carbon-matrix. The EIS patterns are recorded in the hydrogen underpotential deposition (UPD) and overpotential deposition (OPD) regions of the voltammogram in acidic electrolyte (0.1 M HClO 4 ) where the hydrogen interacts with palladium. The atomic ratio of hydrogen to Pd (n (H/Pd) ) estimated from the H upd region of the voltammogram of Pd nanoparticles suggests a gradual α-β transition unlike the sharp transition reported with bulk Pd thin-films. However, a potential range of this transition can be estimated from the EIS patterns. The diffusion characteristics of hydrogen in the Pd lattice are absent in the EIS patterns (at mid-frequency region) of these nanoparticles due to the very small particle size. The kinetic parameters, those effectively describe the Pd-H system, are estimated from the complex non-linear least square (CNLS) fit of the EIS patterns. A maximum in the charge-transfer resistance with potential, similar to that reported with bulk Pd thin-films, is observed with both Pd and Pd 3 Co nanoparticles suggesting the trapping mechanism of hydrogen. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 194
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 113868563
- Full Text :
- https://doi.org/10.1016/j.electacta.2016.01.231