Polycrystalline and Monocrystalline Pore Arrays with Large Interpore Distance in Anodic Alumina

1 January 1999

journal article
Published by The Electrochemical Society in Electrochemical and Solid-State Letters

Vol. 3 (3) , 131-316
https://doi.org/10.1149/1.1390979

Abstract

Silica, titania, and alumina monolithic ceramic chips were prepared via sol‐gel processes. All chips were mesoporous, with average pore sizes of 3.5, 7.7, and for , , and , respectively. Proton conductivity varied linearly with relative humidity in , whereas a steep increase was observed for and between 58 and 81% relative humidity. The variation was linear with temperature for , and exponential for and . At high relative humidity and temperature, conductivities of and were measured for and , respectively. These values are less than one order of magnitude lower than that of Nafion, a polymeric material, and because our membranes can be prepared 100 times thinner than Nafion, they are possible candidates for application as electrolytes in fuel cells. ©1999 The Electrochemical Society

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