Sumi Hirofumi, Shimada Hiroyuki, Yamaguchi Yuki, Mizutani Yasunobu, Okuyama Yuji, Amezawa Koji
Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi, 463-8560, Japan.
Faculty of Engineering, University of Miyazaki, Miyazaki, 889-2192, Japan.
Sci Rep. 2021 May 19;11(1):10622. doi: 10.1038/s41598-021-90211-9.
Protonic ceramic fuel cells (PCFCs) are expected to achieve high power generation efficiency at intermediate temperature around 400-600 °C. In the present work, the distribution of relaxation times (DRT) analysis was investigated in order to deconvolute the anode and cathode polarization resistances for PCFCs supported on yttria-doped barium cerate (BCY) electrolyte in comparison with solid oxide fuel cells (SOFCs) supported on scandia-stabilized zirconia (ScSZ) electrolyte. Four DRT peaks were detected from the impedance spectra measured at 700 °C excluding the gas diffusion process for ScSZ and BCY. The DRT peaks at 5 × 10-1 × 10 Hz and 1 × 10-2 × 10 Hz were related to the hydrogen oxidation reaction at the anode and the oxygen reduction reaction at the cathode, respectively, for both cells. The DRT peak at 2 × 10-1 × 10 Hz depended on the hydrogen concentration at the anode for ScSZ, while it was dependent on the oxygen concentration at the cathode for BCY. Compared to ScSZ, steam was produced at the opposite electrode in the case of BCY, which enhanced the cathode polarization resistance for PCFCs.
质子陶瓷燃料电池（PCFCs）有望在400-600°C左右的中温下实现高发电效率。在本工作中，研究了弛豫时间分布（DRT）分析，以便对以氧化钇掺杂的铈酸钡（BCY）为电解质支撑的PCFCs的阳极和阴极极化电阻进行解卷积，与以氧化钪稳定的氧化锆（ScSZ）为电解质支撑的固体氧化物燃料电池（SOFCs）进行比较。在700°C下测量的阻抗谱中检测到四个DRT峰，不包括ScSZ和BCY的气体扩散过程。对于这两种电池，5×10-1×10Hz和1×10-2×10Hz处的DRT峰分别与阳极的氢氧化反应和阴极的氧还原反应有关。2×10-1×10Hz处的DRT峰对于ScSZ取决于阳极的氢浓度，而对于BCY则取决于阴极的氧浓度。与ScSZ相比，在BCY的情况下，蒸汽在相反电极产生，这增加了PCFCs的阴极极化电阻。
