Communication—Investigation of the Unstable Phenomenon of Electrochemical Impedance Spectroscopy Measurements for Pt Electrode in a Rotating Disk Electrode
Lei Xia, Fen Zhou, Hui Zhang, Zhenbin Liu, Guangfu Li, Shang Li, Mu Pan
Abstract
The instability of Pt electrode during EIS measurement was investigated in RDE. Our results show that this unstable phenomenon is mainly reflected on charge transfer resistance (R ct ). The range of R ct change exhibits a strong dependence on the applied potential. During the repeated EIS tests at above 0.8 V, R ct continuously increase as the testing time, while the double-layer capacitance of Pt electrode reduces, implying the formation of Pt-oxides on the electrode interface. Furthermore, the stability becomes worse at higher potential. After repeated experiment for eight times at 0.9 V, R ct increases to 3.5 times higher of the initial value.
Topics & Concepts
ElectrodeDielectric spectroscopyCapacitanceElectrical impedanceInstabilityMaterials scienceElectrochemistryAnalytical Chemistry (journal)Range (aeronautics)Double-layer capacitanceElectrode potentialChemistryComposite materialMechanicsPhysicsPhysical chemistryChromatographyQuantum mechanicsElectrochemical Analysis and ApplicationsFuel Cells and Related MaterialsElectrocatalysts for Energy Conversion