Abstract
N-type thermoelectric bismuth telluride (Bi2Te3) and bismuth sulfide (Bi2S3) were deposited on virgin carbon fiber (VCF) and recycled carbon fiber (RCF) substrates by electrodeposition. The effects of annealing on the surface morphology and the Seebeck coefficient of the Bi2Te3 and Bi2S3 films were investigated. A nearly stoichiometric N-type Bi2Te3 was obtained from an electrolyte solution of 8 mM of Bi(NO3)3.5H2O and 10 mM of TeO2, which displayed the highest Seebeck coefficient of −20.01 and −13.0 µV/K for VCF and RCF, respectively. The deposition of Bi2S3 was slightly off-stoichiometry, but the improvement was still significant with a Seebeck coefficient of −16.3 and −12.4 µV/K for VCF and RCF, respectively. The effect of varying the annealing temperature (275°C and 350°C) and annealing time (2 and 3 hours) was studied on a nearly stoichiometric N-type Bi2Te3. The result shows an improvement in the Seebeck coefficient by 1.51–1.24 times at 350°C for 2 hours.
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