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LSCF Nanopowder from Cellulose–Glycine‐Nitrate Process and its Application in Intermediate‐Temperature Solid‐Oxide Fuel Cells
Author(s) -
Zhou Wei,
Shao Zongping,
Ran Ran,
Gu Hongxia,
Jin Wanqin,
Xu Nanping
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02242.x
Subject(s) - materials science , cellulose , oxide , chemical engineering , cathode , solid oxide fuel cell , electrolyte , impurity , inorganic chemistry , metallurgy , chemistry , organic chemistry , electrode , engineering
Nanostructured La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) oxide powder was synthesized by a facile autocombustion process based on a modified glycine‐nitrate process (GNP) using cellulose fiber as micro‐reactor. As compared with the normal GNP, this novel process allows the combustion to proceed in a much more environmentally friendly and controllable way. The resulted powder is nanocrystallized with particle size of only 15–20 nm as observed by transmission electron microscopy examination. More importantly, because the metal ions could disperse homogenously in cellulose–GN precursor, SrCO 3 impurity was effectively suppressed. The concentrations of SrCO 3 impurity in LSCF products were determined by carbon dioxide–temperature‐programmed desorption technique, which decreased to as low as 1.3 wt% from cellulose–GN process, in contrast to 4.3 wt% from the normal GNP. These features resulted in the attractive improvement of its cathode performance in solid‐oxide fuel cells (SOFCs). The interfacial resistances of only ∼0.70 and ∼0.36 Ω·cm 2 at 600° and 650°C under air, respectively, were observed, which was about two times better than the LSCF cathode derived from the normal GNP. A peak power density of ∼346 mW/cm 2 was achieved at 600°C with cellulose–GN‐derived LSCF cathode based on thin‐film Sm 0.2 Ce 0.8 O 1.9 electrolyte SOFC using 3% humidified H 2 as the fuel.