High Ionic Conductivity in a LiFeO₂–LiAlO₂ Composite Under H₂/Air Fuel Cell Conditions

Abstract

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Layered LiCoO2–LiFeO2 Heterostructure Composite for Semiconductor-Based Fuel Cells

“…The layered structure of LiCoO 2 is demonstrated in Figure 2 b. The two-dimensional CoO 2 layers consisting of edge-sharing CoO 6 octahedra are separated by lithium layers [ 20 , 21 ]. The HRTEM image in Figure 2 c illustrates a LiCoO 2 -LiFeO 2 nanocomposite structure.…”

“…Interestingly, the electronic conductivity of this material did not cause any internal short-circuit issue in this device during fuel cell working. Parallelly, another electron-conducting LiFeO 2 and insulating LiAlO 2 composite was reported to display a quite high ionic conductivity as 0.24–0.50 S cm −1 at the temperature range of 600–650 °C under H 2 –air fuel cell condition [ 21 ]. The authors proposed that this layer-structured composite possessed multi-ionic conductivities including Li + , H + , O 2− and even e - in SOFC application.…”

Natural Hematite for Next‐Generation Solid Oxide Fuel Cells

“…Jow and Liang [ 26 ] fi rst reported this phenomenon in LiI-Al 2 O 3 interface in 1983. Recently Lan and Tao [ 27 ] report LiFeO 2 -γ -LiAlO 2 composite consisting of an electronic conductor a -LiFeO 2 composited with an insulator γ -LiAlO 2 , which exhibits O 2− , H + , or dual ionic conduction. The situation is similar for hematite, where the electronic conductor α -Fe 2 O 3 and the insulating SiO 2 -CaCO 3 co-exist.…”

Semiconductor TiO2 thin film as an electrolyte for fuel cells

“…10 Tao et al also achieved electrolyte function from an electronic conductor. 11,12 These experimental data suggest that using electronic conductors as an electrolyte is obviously acceptable, but how to suppress their electronic leakage in a fuel cell environment is a critical issue.…”