氧化鎳-鑭鍶鈷鐵奈米纖維陰極電極應用於質子傳導型固態氧化物電化學電池;NiO-LSCF Nanofibrous Cathode Electrode for Proton-conducting Solid Oxide Electrochemical Cells

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题名:	氧化鎳-鑭鍶鈷鐵奈米纖維陰極電極應用於質子傳導型固態氧化物電化學電池;NiO-LSCF Nanofibrous Cathode Electrode for Proton-conducting Solid Oxide Electrochemical Cells
作者:	游易程;Yu, Yi-Cheng
贡献者:	材料科學與工程研究所
关键词:	NiO-LSCF纖維;複合纖維;陰極電極;表面氧交換;固態氧化物燃料電池;NiO-LSCF fibers;composite nanofibers;cathode electrode;surface oxygen exchange;P-SOFCs
日期:	2022-08-23
上传时间:	2022-10-04 11:14:08 (UTC+8)
出版者:	國立中央大學
摘要:	質子傳輸型固態氧化物燃料電池(Proton-conducting solid oxide fuel cells, P-SOFCs)於工作溫度範圍(500-800 ℃)擁有優秀的質子傳導性、化學穩定性與電池密封性。但隨著工作溫度降低，會導致陰極電極的氧化還原能力(ORR)下降。由於NiO材料具有優秀的氧離子導率與表面氧交換能力，讓陰極電極側可以快速地解離氧氣和傳輸氧離子，以此有效提高電化學電池之性能，並且減少陰極電極之阻抗。於本研究中，將使用不同X wt% NiO-LSCF (X=0, 10, 15, 20)奈米纖維作為P-SOFC的陰極電極。結果表示，NiO奈米顆粒在於LSCF纖維表面可以有效提升電池性能，因為NiO不僅擁有優良的離子導率，提供表面氧交換速率，其可以加速氧氣在形成氧離子過程中吸附、脫附與解離反應，以此來降低氧氣催化反應與氧離子傳輸到電解質界面處之極化阻抗。 15 wt% NiO-LSCF纖維電池於800°C 下進行性能測量，可得到最高功率密度約為477.6 mW/cm2，與純LSCF纖維電池相比高 18.5%，其原因為歐姆阻抗和極化阻抗分別降低了為26% 和71%。另一方面，在SOEC模式下進行15 wt% NiO-LSCF電解電池(Electrolyzer cell, EC)，先在陰極電極側電解水氣，而後在陽極電極側產生氫氣，法拉第效率(FE)與能量轉換效率(ECE)為69%與68%，其產氫的速率則為7.82 ml/min。本研究結果顯示，15 wt% NiO-LSCF奈米纖維在P-SOFC中不僅擁有優秀的氧氣解離與氧離子傳輸之速率，於800 ℃下進行FC模式時，其電池之性能具有最高功率密度為477.6 mW/cm2。故15 wt% NiO-LSCF纖維電池成功應用於FC與EC模式，而15 wt% NiO-LSCF纖維陰極將提供P-SOFC裝置商業化發展之可能性。 ;P-SOFCs have excellent proton conductivity, chemical stability, and better sealing in the operating temperature range (500-800 °C). However, with the operating temperature decreasing, the oxygen reduction reaction capability of the cathode electrode will be lower. Due to the superior oxygen-ionic conductivity and surface oxygen exchange capability of NiO nanoparticles, the cathode electrode will generate faster oxygen dissociation and offer the oxygen surface transport paths. NiO nanoparticles can effectively improve the electrochemical cell’s performance and reduce the cathode electrode’s impedance. In this study, different content NiO such as X wt% NiO-LSCF (X=0, 10, 15, 20) nanofibers were used as the cathode electrode of P-SOFC. The results show that NiO nanoparticles on the surface of LSCF fibers can efficiently improve the performance of cell. NiO not only has excellent ionic conductivity and surface oxygen exchange rate but also accelerates the adsorption, desorption, and dissociation of oxygen. The NiO-LSCF nanofibrous cells will reduce the polarization resistance, which is about oxygen catalytic reaction and oxygen-ionic ‎transportation to the electrolyte interface. At 800 °C, the performance test of the 15 wt% NiO-LSCF nanofibrous cell obtains a max. power density of 477.6 mW/cm2. It is higher 18.5% than the pure LSCF nanofibrous cell because ohmic impedance and polarization impedance are reduced by about 26% and 71%. In SOEC mode, the 15 wt% NiO-LSCF electrolyzer cell, which is H2O electrolysis at the cathode electrode and H2 generation at the anode electrode, has the Faraday′s efficiency and energy conversion efficiency of 69% and 68%. On the other hand, the hydrogen evolution rate of 15 wt% NiO-LSCF nanofiber cell is up to 7.82 ml/min. This study shows that 15 wt% NiO-LSCF nanofibers not only have excellent oxygen dissociation and oxygen-ionic transportation rate in P-SOFC but also have a max. power density of 477.6 mW/cm2 at 800 °C. Therefore, 15 wt% NiO-LSCF cell has been successfully applied in FC and EC modes. The 15 wt% NiO-LSCF nanofibrous cathode will provide the possibility for commercial development of P-SOFC devices in the future.
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