Premium
Microstructure and Polarization Studies on Interlayer Free La 0.65 Sr 0.3 Co 0.2 Fe 0.8 O 3– δ Cathodes Fabricated on Yttria Stabilized Zirconia by Solution Precursor Plasma Spraying
Author(s) -
Shri Prakash B.,
Balaji N.,
Senthil Kumar S.,
Aruna S. T.
Publication year - 2016
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600119
Subject(s) - yttria stabilized zirconia , materials science , cathode , microstructure , electrolyte , polarization (electrochemistry) , analytical chemistry (journal) , cubic zirconia , chemical engineering , composite material , ceramic , chemistry , electrode , organic chemistry , engineering
Nano‐structured cathodes of La 0.65 Sr 0.3 Co 0.2 Fe 0.8 O 3– δ (LSCF) are fabricated by solution precursor plasma spraying (SPPS) on yttria stabilized zirconia (YSZ) electrolytes (LSCF‐SPPS‐YSZ). Phase pure LSCF is obtained at all plasma power. Performances of LSCF‐SPPS‐YSZ cathodes are compared with conventionally prepared LSCF cathodes on YSZ (LSCF‐C‐YSZ) and gadolinium doped ceria (GDC) (LSCF‐C‐GDC) electrolytes. High R p is observed in the LSCF‐C‐YSZ (∼42 Ohm cm 2 at 700 °C) followed by LSCF‐C‐GDC (R p ∼ 1.5 Ohm cm 2 at 700 °C) cathodes. Performance of the LSCF‐SPPS‐YSZ cathodes (R p ∼ 0.1 Ohm cm 2 at 700 °C) is found to be even superior to the performance of LSCF‐C‐GDC cathodes. High performance in LSCF‐SPPS‐YSZ cathodes is attributed to its nano‐structure and absence of any interfacial insulating phase which may be attributed to the low temperature at the interaction point of LSCF and YSZ and low interaction time between LSCF and YSZ during SPPS process. In the time scale of 100 h, no change in the polarization resistances is observed at 750 °C. Based on the literature and from the present studies it can be stated that SOFC with YSZ electrolyte and LSCF‐SPPS‐YSZ cathode can be operated at 750 °C for a longer duration of time and good performance can probably be achieved.