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The Effect of Plasma Spraying Power on La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3–δ –La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3–δ Composite Cathode Interlayer Microstructure and Cell Performance
Author(s) -
Tsai C. H.,
Hwang C. S.,
Chang C. L.,
Nien S. H.,
Chuang C. M.,
Chuang Shie Z. Y.
Publication year - 2014
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.201300143
Subject(s) - materials science , cathode , anode , composite number , analytical chemistry (journal) , microstructure , power density , polarization (electrochemistry) , electrolyte , current density , oxide , solid oxide fuel cell , nickel , atmospheric pressure plasma , plasma , composite material , metallurgy , electrode , electrical engineering , power (physics) , chemistry , physics , chromatography , quantum mechanics , engineering
The metal‐supported intermediate temperature solid oxide fuel cells with a porous nickel substrate, a nano‐structured LDC (Ce 0.55 La 0.45 O 2–δ )–Ni composite anode, an LDC diffusion barrier layer, an LSGM (La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3–δ ) electrolyte, an LSCF (La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3–δ )–LSGM composite cathode interlayer and an LSCF cathode current collector are fabricated by atmospheric plasma spraying. Four different plasma spraying powers of 26, 28, 30, and 34 kW are used to fabricate the LSCF–LSGM composite cathode interlayers. Each cell with a prepared LSCF–LSGM composite cathode interlayer has been post‐heat treated at 960 °C for 2 h in air with an applied pressure of 450 g cm –2 . The current‐voltage‐power and AC impedance measurements indicate that the LSCF–LSGM composite cathode interlayer formed at 28 kW plasma spraying power has the best power performance and the smallest polarization resistance at temperatures from 600 to 800 °C. The microstructure of the LSCF–LSGM composite cathode interlayer shows to be less dense and composed of smaller dense regions as the plasma spraying power decreases to 28 kW. The durability test of the cell with an optimized LSCF–LSGM composite cathode interlayer gives a degradation rate of 1.1% kh –1 at the 0.3 A cm –2 constant current density and 750 °C test temperature.