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Mechanisms and Kinetics of Electrochemical Intercalation of Oxygen into Nd2NiO4+δ

Published online by Cambridge University Press:  15 February 2011

H. Fritze ,
H. L. Tuller ,
J. Berthold  and
B. Schultrich
H. Fritze
Affiliation:
Massachusetts Institute of Technology, Department of Material Science & Engineering, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, hfritze@mit.edu
H. L. Tuller
Affiliation:
Massachusetts Institute of Technology, Department of Material Science & Engineering, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
J. Berthold
Affiliation:
Fraunhofer-Institut für Werkstoffphysik und Strahltechnologie, Winterbergstraße 28, 01277 Dresden, Germany
B. Schultrich
Affiliation:
Fraunhofer-Institut für Werkstoffphysik und Strahltechnologie, Winterbergstraße 28, 01277 Dresden, Germany
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Abstract

Overstoichiometric insertion of oxygen into thin films of Nd2NiO4+δwas performed electrochemically at room temperature (RT) in order to obtain an in-situ compositional analysis of the process. Thin Nd2NiO4+δlayers were deposited onto resonators of a Quartz Crystal Microbalance (QCM) by Pulsed Laser Deposition (PLD). Cyclic voltammograms showed oxidation and reduction peaks typical for these oxides. The change in oxygen stoichiometry was determined by in-situ QCM measurements during potential step experiments. The resulting maximum mass change was on the order of 50 ng and corresponded to a maximum excess oxygen content of δ = 0.12 in Nd2NiO4+δ. The time dependence of the mass change was described by a transport model which leads to oxygen diffusion coefficients in the range from 2.10−12 to 10−11 cm2/s depending on δ and the direction of the reaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 575
Copyright
Copyright © Materials Research Society 1999

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References

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