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Ionic Transport in Solids

Advances in the understanding of ionic transport phenomena drive the development of many of our lab's technologies. Solid oxide fuel cells (SOFC's), solid state sensors, and ion transport membranes are all, in essence, ionic transport harnessed for a specific technological purpose. Whether the objective is to separate gasses, produce electricity, or purify water, ionic transport rests at the heart.

Our lab focuses on high temperature ionic transport through ceramic materials. We published insights that show the importance of the topological connectivity of the triple phase boundary (TPB) in ion conductivity which led directly to increased SOFC performance. Similarly, our development of SNDC electrolyte with a 30% higher grain ionic conductivity than gadolinium doped cerium (GDC) led directly to a low ohmic resistance SOFC at 500ºC, an unprecedented performance at that temperature.


“Crystal Structure-Ionic Conductive Relationships in Doped Ceria Systems,” S. Omar, E. D. Wachsman, J. L. Jones, and J. C. Nino, Journal of the American Ceramic Society, 92, 2674-2681 (2009).

"Hydrogen Permeability and Effect of Microstructure on Mixed Protonic-Electronic Conducting Eu-doped Strontium Cerate," S. J. Song, E. D. Wachsman, J. Rhodes, H. –S. Yoon, K. –H. Lee, G. Zhang, S. E. Dorris, and U. Balachandran, Journal of Materials Science, 40, 4061-4066 (2005).

"Defect Structure and Transport Properties of Ni-SrCeO3-δ Cermet for Hydrogen Separation Membrane," S. J. Song, T. H. Lee, E. D. Wachsman, L. Chen, S. E. Dorris, and U. Balachandran, Journal of the Electrochemical Society, 152 (11), J125-129 (2005).

"A Model for the Spatial Distribution and Transport Properties of Defects in Mixed Ionic-Electronic Conductors: Part I Defect Concentration - Pressure Relationship," K. L. Duncan and E. D. Wachsman, Ionics, 6, 145-155 (2000).

"The Spatial Distribution and Transport of Defects in Mixed Ionic-Electronic Conductors: A Rigorous Model," K. L. Duncan and E. D. Wachsman, Solid State Ionic Devices, Electrochem. Soc., E.D. Wachsman, J. Akridge, M. Liu, and N. Yamazoe, Ed., 99-13, 159-171 (1999).

"Oxide-Ion Conducting Ceramics: Defect Chemistry and Applications," E. D. Wachsman, in Progress in Ceramic Basic Science: Challenge Toward the 21st Century, T. Hirai, S. Hirano, and Y. Takeda, eds., The Basic Science Division of The Ceramic Society of Japan, 129-143 (1996).

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