| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 104 === In the present investigation, Pr2NiO4 (PNO) and PNO-Sm0.2Ce0.8O2-δ co-electrospinning nanofibers were prepared for cathodic material using electrospinning method at the temperature between 600 to 800˚C for an intermediate temperature solid oxide fuel cells (IT-SOFCs). The 60 wt.% NiO anode material and 40 wt.% SDC20 have good ionic conductivity for SDC20 electrolyte. A single cell anode-supported PNO was prepared by the co-pressured pellet and coated with PNO cathode on SDC. Pr2NiO4 is a nickel-based layered perovskite structure (K2NiF4) and prepared as a cathode of PNO fiber by electrospinning method. The resulting PNO cathode has exhibited a good performance in the anode part, and was analyzed using electrochemical measurements. The large number of cathode fiber induced the maximum triple-phase boundary (TPB), and promoted the diffusion of oxygen ions to the surface, which result into the low activation energy, and high oxidation-reduction reaction. Single cell was analyzed by XRD, SEM, electrochemical analysis, AC impedance analyzer etc., and explored to identify the microstructure and calculation of power density. The PNO precursor fibers prepared at different heat treatment temperatures, and 1200˚C calcined has pure phase of PNO cathode fiber with high porous surface morphology. The PNO cathode fibers, ethyl cellulose and α - terpineol were prepared for cathode by paste to blade on the Sm0.2Ce0.8O1.9 (SDC20) to form pellets. The as-prepared anode of NiO-SDC20 to form a Ag/Pr2NiO4/SDC20/NiO-SDC20/Ag single cells, and measured by electrochemical analyzer from Jiehan5000 at 800, 750, 700, 650 and 600˚C. The maximum power density about 260, 203, 133, 75 and 47 mW/cm2 was achieved. The 5 wt.% containing SDC greatly improved the power density at 800, 750, 700, 650 and at 600˚C, and the maximum power density of 563, 533, 475, 266 and 140 mW/cm2 was obtained using I(current) - V(voltage) - P(power) curves. A small amount of 5 wt.% SDC has the lowest polarization resistance (RP), the area specific resistance (ASR), activation energy (activation energy) and the highest exchange current density (i0) at 800˚C. The result demonstrates that Pr2NiO4-5 wt.% SDC fiber can be used as a potential cathode material for SOFCs.
|
|---|
