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Electrochemical behavior of ceria with selected metal electrodes

Chueh, William C. and Lai, Wei and Haile, Sossina M. (2008) Electrochemical behavior of ceria with selected metal electrodes. Solid State Ionics, 179 (21-26). pp. 1036-1041. ISSN 0167-2738. doi:10.1016/j.ssi.2007.12.087.

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The electrochemical properties of the metal | doped ceria | metal system have been examined by A.C. impedance spectroscopy at a range of temperatures (575-650 °C) and oxygen partial pressures (8 x 10^-26 -0.21 atm). Under reducing conditions, the inverse of the interfacial resistances for both Pt and Au electrodes on samarium-doped ceria (SDC) displayed a p(O2)^-1/4 dependence on oxygen partial pressure and an Arrhenius dependence on temperature with an activation energy of ~2.7 eV. The similarity in the characteristics of the two types of electrode materials indicates that the electrochemical oxidation of hydrogen occurs predominantly at the ceria │ gas interface. Moreover, the behavior, which is similar to that of the electronic conductivity of SDC, is consistent with the hypothesis that electron migration from the reaction site to the metal current collector is the rate-limiting step.

Item Type:Article
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Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2008 Elsevier B.V. Received 13 August 2007; received in revised form 28 December 2007; accepted 31 December 2007. This work was funded by the Office of Naval Research, Office of Electrochemical Power Science and Technology via the MURI program and under subcontract from the Colorado School of Mines.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:electrode-electrolyte interface; electrochemical oxidation; ceria; mixed conductors
Issue or Number:21-26
Record Number:CaltechAUTHORS:CHUssi08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13279
Deposited By: Tony Diaz
Deposited On:06 Apr 2009 21:53
Last Modified:08 Nov 2021 22:36

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