Abstract
Nano-sized Ca 2.8Cu 0.2Co 4O 9 powders were synthesized by the solution combustion process, using five different fuels, i.e., aspartic acid, alanine, glutamic acid, glycine, and urea. The combustion process lowered both the calcination and sintering temperatures. The sintered Ca 2.8Cu 0.2Co 4O 9 consisted of plate-like grains that were favorable for high energy conversion efficiency. In the comparative study of various different fuels, aspartic acid-processed Ca 2.8Cu 0.2Co 4O 9 showed an extremely high Seebeck coefficient, thus resulting in an enhanced power factor. The highest power factor value (8.05 × 10 −4 Wm −1 K −2) was attained for the aspartic acid-processed sample at 800 °C.
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