Choi, Sung Min An, Hyegsoon Yoon, Kyung Joong Kim, Byung-Kook Lee, Hae-Weon Son, Ji-Won Kim, Hyoungchul Shin, Dongwook Ji, Ho-Il Lee, Jong-Ho 2024-01-19T21:02:35Z 2024-01-19T21:02:35Z 2021-09-04 2019-01-01 0306-2619 https://pubs.kist.re.kr/handle/201004/120489 High-performance and cost-effective fabrications should be simultaneously achieved for practical applications of fuel cells. Unfortunately, protonic ceramic fuel cells, which are considered next-generation solid oxide fuel cells operating at lower temperatures (<= 600 degrees C), do not satisfy the requirements. While thin electrolyte and rapid reactions at electrode/electrolyte interfaces are crucial for cell performance, the thickness of the electrolyte via cost-effective ceramic processes is still not satisfactory (currently capable of > 10 mu m) and the electrode reaction (s) are yet to be clarified. Here we demonstrate the fabrication of a columnar-structured thin electrolyte (similar to 2.5 mu m) of BaCe0.55Zr0.3Y0.15O3-delta, in which no perpendicular grain boundaries exist against the current direction, through a low-cost screen printing method. A high open-cell voltage of 1.10 V ensures that the thin electrolyte is sufficiently dense for gas-tightness, thereby achieving an extraordinary maximum power density of 350 mW/cm(2) at 500 degrees C. The electrode reactions are investigated by distribution of relaxation time method based on electrochemical impedance spectroscopy as a function of oxygen partial pressure and hydrogen partial pressure at 500 degrees C, suggesting that the reaction step corresponding to the surface diffusion of an adsorbed oxygen to the triple phase boundaries at the cathode is most probably the main contributor to the overall polarization resistances. English ELSEVIER SCI LTD DOPED BARIUM ZIRCONATE CHEMICAL-STABILITY COMPOSITE CATHODE ELECTRICAL-CONDUCTIVITY PHASE-STABILITY POWER-DENSITY FABRICATION CONDUCTORS DECONVOLUTION TRANSPORT Electrochemical analysis of high-performance protonic ceramic fuel cells based on a columnar-structured thin electrolyte Article 10.1016/j.apenergy.2018.10.043 1 APPLIED ENERGY, v.233, pp.29 - 36 APPLIED ENERGY 233 29 36 scie scopus 000454376900003 2-s2.0-85055291647 Energy & Fuels Engineering, Chemical Energy & Fuels Engineering Article DOPED BARIUM ZIRCONATE CHEMICAL-STABILITY COMPOSITE CATHODE ELECTRICAL-CONDUCTIVITY PHASE-STABILITY POWER-DENSITY FABRICATION CONDUCTORS DECONVOLUTION TRANSPORT Proton conducting oxides Protonic ceramic fuel cells Distribution of relaxation time method Electrode reaction