Virtual Labs

Electrochemical Impedance spectroscopy study of ferricyanide system using different working electrodes

Q1. Electrochemical Impedance Spectroscopy (EIS) primarily measures:

a: Impedance as a function of frequency. Explanation

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b: Current as a function of time. Explanation

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c: Potential as a function of time. Explanation

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d: Charge as a function of potential. Explanation

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Q2. In a Nyquist plot, the diameter of the semicircle corresponds to:

a: Warburg impedance. Explanation

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b: Charge transfer resistance (Rct). Explanation

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c: Double-layer capacitance (Cdl). Explanation

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d: Solution resistance (Rs). Explanation

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Q3. Changing the working electrode material mainly affects:

a: Frequency range of measurement. Explanation

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b: Charge transfer resistance and interfacial behavior. Explanation

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c: Electrolyte conductivity. Explanation

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d: Reference electrode potential. Explanation

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Q4. A typical electrochemical impedance experimental setup consists of an electrochemical cell, a potentiostat/galvanostat, and _____________.

a: A reference electrode. Explanation

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b: Open circuit potential (OCP). Explanation

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c: A frequency response analyzer (FRA). Explanation

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d: A working electrode. Explanation

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Q5. Which of the following electrodes is necessary to close the electrical circuit in an electrochemical cell?

a: The counter electrode. Explanation

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b: The working electrode. Explanation

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c: The reference electrode. Explanation

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d: Working and counter electrode. Explanation

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Q6. _______________ is the total opposition offered by a RL series circuit?

a: Reactance. Explanation

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b: Resistance. Explanation

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c: Inductance reactance. Explanation

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d: Impedance. Explanation

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Q7. The ferricyanide/ferrocyanide redox couple is commonly used in EIS because it:

a: Is electrochemically irreversible. Explanation

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b: Has low solubility in aqueous media. Explanation

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c: Shows fast and well-defined electron transfer kinetics. Explanation

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d: Forms insulating surface films. Explanation

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Q8. Impedance is the ratio of:

a: Voltage to current. Explanation

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b: Current to voltage. Explanation

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c: Potential to current. Explanation

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d: Current to potential. Explanation

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