The Capacitance of Nickel Pattern Electrodes on Zirconia Electrolyte. Issue 10 (25th August 2016)

• Record Type: Journal Article
• Authors: Doppler, M. C.; Fleig, J.; Bram, M.; Opitz, A. K.
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 10(2016)
• Page Start: H1019
• Page End: H1025
• Publication Date: 2016-08-25
• Subjects: metal/solid electrolyte interface -- microelectrode -- SOFC anode; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0951610jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Micro-structured thin-film electrodes were employed to investigate the capacitive behavior of nickel on yttria-stabilized zirconia (YSZ) electrolytes by means of electrochemical impedance spectroscopy. Electrodes with different shapes and electrode areas clearly showed a linear relationship between capacitance and the electrode area. Electrostatic double layer models, however, could not explain the observed area specific capacitance value of ca. 3 F/m². This fact, the characteristic voltage dependence with a hysteresis, and the effect of H2 S on the electrode capacitance indicate substantial contributions of a chemical capacitance. Possible types of chemical capacitance in the system Ni(H2 /H2 O)/YSZ are discussed and an oxygen partial pressure dependent mechanism change is suggested.