Lee, Daehee Kim, Dongha Kim, Joosun Moon, Jooho 2024-01-20T10:31:25Z 2024-01-20T10:31:25Z 2021-09-05 2014-02-03 2045-2322 https://pubs.kist.re.kr/handle/201004/127105 Electrochemical analysis allows in situ characterization of solid oxide electrochemical cells (SOCs) under operating conditions. However, the SOCs that have been analyzed in this way have ill-defined or uncommon microstructures in terms of porosity and tortuosity. Therefore, the nano-scale characterization of SOCs with respect to three-phase boundaries has been hindered. Weintroduce novel in situ electrochemical analysis for SOCs that uses combined solid electrolyte potentiometry (SEP) and impedance measurements. This method is employed to investigate the oscillatory behavior of a porous Ni-yttria-stabilized zirconia (YSZ) anode during the partial oxidation of methane under ambient pressure at 800 degrees C. The cyclic oxidation and reduction of nickel induces the oscillatory behavior in the impedance and electrode potential. The in situ characterization of the nickel surface suggests that the oxidation of the nickel occurs predominantly at the two-phase boundaries, whereas the nickel at the three-phase boundaries remains in the metallic state during the cyclic redox reaction. English NATURE PUBLISHING GROUP OSCILLATORY BEHAVIOR IN-SITU CO OXIDATION NI TEMPERATURE CATALYSIS IMPEDANCE STATE ANODE PD Characterizing nano-scale electrocatalysis during partial oxidation of methane Article 10.1038/srep03937 1 SCIENTIFIC REPORTS, v.4 SCIENTIFIC REPORTS 4 scie scopus 000331215800001 2-s2.0-84893852740 Multidisciplinary Sciences Science & Technology - Other Topics Article OSCILLATORY BEHAVIOR IN-SITU CO OXIDATION NI TEMPERATURE CATALYSIS IMPEDANCE STATE ANODE PD fuel cells electrocatalysis