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High Ionic Conductivity in a LiFeO 2 –LiAlO 2 Composite Under H 2 /Air Fuel Cell Conditions
Author(s) -
Lan Rong,
Tao Shanwen
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404476
Subject(s) - ionic conductivity , composite number , conductivity , materials science , electrical conductor , ionic bonding , electrolyte , fast ion conductor , electrochemistry , conductor , fuel cells , chemical engineering , composite material , chemistry , ion , electrode , organic chemistry , engineering
New ionic conducting materials for electrolytes for electrochemical devices have been attracting the interest of researchers in energy materials. Here, for the first time, we report a conductive composite with high ionic conductivity derived from an electronic conductor α‐LiFeO 2 and an insulator γ‐LiAlO 2 . High conductivity was observed in the α‐LiFeO 2 –γ‐LiAlO 2 composite when prepared by a solid state reaction method. However, the conductivity enhancement in α‐LiFeO 2 –γ‐LiAlO 2 composite was not observed when the two oxides were mechanically mixed. The α‐LiFeO 2 –γ‐LiAlO 2 composite also exhibits O 2− or/and H + ionic conduction which was confirmed through H 2 /air fuel cell measurements. An exceptionally high conductivity of 0.50 S cm −1 at 650 °C was observed under H 2 /air fuel cell conditions. This provides a new approach to discover novel ionic conductors from composite materials derived from electronic conductors.