자기 변환 셀 : 하나의 대기 적응 재료를 사용한 비대칭 셀

Abstract

Symmetrical solid oxide cells (SSOCs) have got tremendous attention as alternatives to obtain practical benefits such as minimized compatibility issues, simple fabrication process, and reduced cost by using the identical material to both electrodes. Nevertheless, the use of the same material (symmetrical configuration) results in lower performance than the dissimilar electrode (asymmetrical configuration), since the electrode of the SSOC has the low catalytic activity for the anode and/or cathode reactions. Thus, herein, the self-transforming solid oxide cells were suggested with benefits typically associated with symmetrical configurations—such as ease of fabrication— together with the high performance of asymmetrical configurations. The self-transforming cell is realized by using an atmospheric-adaptive material Pr0.5Ba0.5Mn0.85Co0.15O3-δ (PBMCo) that alters its structure to be layered in the fuel atmosphere while retaining its original structure in the air atmosphere and used this material for the electrodes. As a fuel cell, the self-transforming cell shows the excellent electrochemical performance of 1.10 W cm-2 at 800 oC with stability for 100 h. As an electrolysis cell, the current densities were -0.42 and -0.62 A cm-2 for 3 vol.% and 10 vol.% H2O, respectively, at a cell voltage of 1.3V at 700 oC.