Toriumi Hajime, Jeong SeongWoo, Kitano Sho, Habazaki Hiroki, Aoki Yoshitaka
Graduate School of Chemical Sciences and Engineering, Hokkaido University, N13W8 Kita-ku, Sapporo 060-8628, Japan.
Faculty of Engineering, Hokkaido University, N13W8 Kita-ku, Sapporo 060-8626, Japan.
ACS Omega. 2022 Mar 9;7(11):9944-9950. doi: 10.1021/acsomega.2c00569. eCollection 2022 Mar 22.
Proton-conducting solid oxide electrolysis cells (H-SOEC) containing a 15-μm-thick BaZrCeYO (BZCY622) electrolyte thin film, porous cathode cermet support, and LaSrCoFeO anodes were fabricated using a reactive cofiring process at approximately 1400 °C. Steam electrolysis was conducted by supplying wet air to the anode at a water partial pressure of 20 kPa. The performance was evaluated using electrochemical measurements and gas chromatography. At 600 °C, the cells generated an electrolysis current of 0.47 A cm at a 1.3 V bias while the Faradaic efficiency reached 56% using 400 mA cm. The electrolysis performance was efficiently improved by introducing a 40-nm-thick LaSrCoO (LSC) nanolayer as an anode functional layer (AFL). The cells with LSC AFL produced an electrolysis current of 0.87 A cm at a 1.3 V bias at 600 °C, and the Faradaic efficiency reached 65% under 400 mA cm. Impedance analysis showed that the introduction of the AFL decreased the ohmic resistances and improved interfacial proton transfer across the anode/electrolyte interface and polarization resistances related to the anode reaction. These results demonstrate opportunities for future research on AFL to improve the performance of H-SOECs with Zr-rich BaZr Ce Y O electrolytes.
采用反应共烧工艺在约1400℃下制备了含15μm厚BaZrCeYO（BZCY622）电解质薄膜、多孔阴极金属陶瓷支撑体和LaSrCoFeO阳极的质子传导固体氧化物电解池（H-SOEC）。通过向阳极供应水蒸气压为20kPa的湿空气进行蒸汽电解。使用电化学测量和气相色谱法评估性能。在600℃时，电池在1.3V偏压下产生0.47A/cm²的电解电流，而在400mA/cm²时法拉第效率达到56%。通过引入40nm厚的LaSrCoO（LSC）纳米层作为阳极功能层（AFL），有效提高了电解性能。具有LSC AFL的电池在600℃、1.3V偏压下产生0.87A/cm²的电解电流，在400mA/cm²下法拉第效率达到65%。阻抗分析表明，AFL的引入降低了欧姆电阻，改善了阳极/电解质界面的界面质子转移以及与阳极反应相关的极化电阻。这些结果为未来研究AFL以提高含富Zr BaZrCeYO电解质的H-SOEC性能提供了机会。
