Abstract
Molten-solid composite oxides are candidates as oxygen transport membranes (OTMs) at intermediate temperatures. We report the electrical conductivity characteristics of a 30 mol% V2O5–ZrV2O7 composite with a eutectic melting point at ∼670 °C.
Highlights
Molten oxides immersed in porous ceramics are potential candidates as oxygen transport membranes (OTMs) at intermediate temperatures (500–700 C),[1,2] but the development is still at an early stage
To increase the fundamental understanding of the mechanisms governing surface kinetics and transport in molten-solid OTMs, we study the electrical conductivity, ionic transport number and electrode impedance in a molten-solid V2O5–ZrV2O7 composite system
We investigate a 30 mol% V2O5–ZrV2O7 composite by means of electrochemical impedance spectroscopy (EIS) and electromotive force measurements
Summary
Molten oxides immersed in porous ceramics are potential candidates as oxygen transport membranes (OTMs) at intermediate temperatures (500–700 C),[1,2] but the development is still at an early stage. To increase the fundamental understanding of the mechanisms governing surface kinetics and transport in molten-solid OTMs, we study the electrical conductivity, ionic transport number and electrode impedance in a molten-solid V2O5–ZrV2O7 composite system. High operating temperatures impose challenges with respect to energy efficiency and material degradation, and OTMs working at intermediate temperatures are pursued.[4] Generally, it has proved difficult to nd solid oxides with sufficiently low activation energies for the oxide ion conductivity to serve as membranes at intermediate temperatures.[5,6] In this respect, dual-phase materials where one of the phases is molten have recently shown accelerated transport of oxide ions in the molten phase at intermediate temperatures due to relatively low energy barriers for migration.[1,7,8]
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