High Temperature Stability of Silver Based Porous Nanocomposites for Electrochemical Devices
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High Temperature Stability of Silver Based Porous Nanocomposites for Electrochemical Devices Ayhan Sarikaya, Vladimir Petrovsky and Fatih Dogan Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, U.S.A. ABSTRACT High temperature (>550oC) applications of silver based porous composites have been limited due to relatively low melting temperature (962oC) of Ag. Incorporation of oxide particles was demonstrated as an effective approach for stabilization of the porous Ag microstructures. This study aims developing an understanding based on the relationships between the properties of the incorporated YSZ (yttria-stabilized zirconia), the developed porous microstructures and the electrochemical response of their electrodes. Minimum degradation was observed with the composite microstructure based on comparable Ag and YSZ particle sizes. The results demonstrated that YSZ incorporation into Ag matrix can increase the stable application temperature to 800oC. INTRODUCTION Silver based composites have been highly attractive materials for current collection (i.e. electrical contact) applications in electronic devices due to their substantial electrical conductivity. Ag has other desirable properties such as oxygen conductivity due to solubility and diffusion of oxygen, ductility and lightweight with respect to other non-oxidizing metal options (e.g. Pt, Ag and Pd) besides the highest electrical conductivity among metals. However, the use of Ag is limited at elevated temperatures (
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