The Capacitance of Nickel Pattern Electrodes on Zirconia Electrolyte

M. C. Doppler, J. Fleig, M. Bram, A. K. Opitz
2016 Journal of the Electrochemical Society  
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/m 2 . This fact, the characteristic voltage
more » ... cteristic voltage dependence with a hysteresis, and the effect of H 2 S on the electrode capacitance indicate substantial contributions of a chemical capacitance. Possible types of chemical capacitance in the system Ni(H 2 /H 2 O)/YSZ are discussed and an oxygen partial pressure dependent mechanism change is suggested. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.94.122.86 Downloaded on 2016-09-01 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.94.122.86 Downloaded on 2016-09-01 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.94.122.86 Downloaded on 2016-09-01 to IP
doi:10.1149/2.0951610jes fatcat:7ucwrcix5rbd3ef6jndod4ylju