本研究藉由添加直徑500 nm之聚苯乙烯奈米球(PS奈米球)作為陰極材料之造孔劑，開發出用於質子傳輸型固態氧化物燃料電池之孔隙自我梯度排列陰極，並且研究添加PS奈米球之含量對於陰極微觀結構與電池性能之影響。由於PS奈米球與LSCF粉末兩者之密度差異，驅使PS奈米球於陰極重新排列，產生具有梯度之多孔陰極結構。研究結果顯示，15%PS-LSCF於800 ℃之操作溫度下具有146.6 mW/cm2之功率密度，其歐姆阻抗與極化阻抗分別為3.117 Ω‧cm2與0.070 Ω‧cm2；而未添加PS奈米球之LSCF陰極(0%PS-LSCF)僅有49.51 mW/cm2之功率密度，其歐姆阻抗與極化阻抗分別為6.781 Ω‧cm2與0.292 Ω‧cm2。此性能之提升可歸因於具有梯度之多孔陰極結構，使得15%PS-LSCF具有更緻密之陰極－電解質界面，並有效降低電池之歐姆阻抗與極化阻抗。;In this study, 500-nm-diameter polystyrene (PS) nanospheres are used as the pore forming agent in LSCF cathode for proton-conducting solid oxide fuel cells. The effects of PS nanosphere amount on cathode microstructure and cell performance is investigated. A gradient porous cathode is fabricated due to the density difference between the PS nanospheres and LSCF cathode. Results show that, 15%PS-LSCF exhibits highest power density of 146.6 mW/cm2 at 800 ℃ with an ohmic and polarization resistance of 3.117 Ω‧cm2 and 0.070 Ω‧cm2 respectively. Whereas, the 0%PS-LSCF exhibits a power density of 9.51 mW/cm2 with an ohmic and polarization resistances of 6.781 Ω‧cm2 and 0.292 Ω‧cm2 respectively. The 15% PS-LSCF cell exhibits lower cell resistance and enhanced cell performance of three times compared to 0% PS-LSCF cell. The higher cell performance of 15% PS-LSCF cell is attributed to the gradient porous cathode with higher cathode-electrolyte interface favoring an efficient protonic transfer in cell performance.
