Electrode-Electrolyte Interfaces in Electrochemical Systems

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What is the main advantage of using Electrochemical Impedance Spectroscopy (EIS) in studying electrochemical systems?

It only focuses on the charge-transfer process at the electrode-electrolyte interface.

It allows for the exploration of the concentration of electroactive species. (correct)

It can study material properties but not specific processes.

It does not provide any information on conductance or resistance.

Which of the following is an element typically characterized in an electrical circuit using EIS?

Friction between the electrode and the electrolyte

Chemical bonding at the electrode surface

Temperature change within the electrolyte

Mass-transfer from the bulk solution to the electrode surface (correct)

In an electrochemical cell, what does the solution resistance primarily refer to?

Resistance caused by electrode corrosion

Resistance offered by the electrolyte solution to ion movement (correct)

Resistance related to free electron movement

Resistance due to lack of charge transfer at the electrode surface

Which of the following best describes one of the features that can be explored using Electrochemical Impedance Spectroscopy?

Conductance, resistance, or capacitance changes in an electrochemical system Signup and view all the answers

What does EIS focus on in terms of conductance, resistance, or capacitance of an electrochemical system?

Intrinsic material properties or specific processes that affect these features Signup and view all the answers

Which element of an electrochemical system involves charge-transfer, mass-transfer, and resistance of the electrolyte?

Electrode-electrolyte interface interactions Signup and view all the answers

What is the primary purpose of Electrochemical Impedance Spectroscopy (EIS)?

To investigate the behavior of electrochemical systems Signup and view all the answers

Which elements are typically present in an equivalent circuit used for EIS analysis?

Electrolyte resistance, charge transfer resistance, double layer capacitance Signup and view all the answers

What is the main challenge in conducting EIS measurements?

Maintaining a constant potential between the working and reference electrodes Signup and view all the answers

Which electrode is responsible for applying the potential in an electrochemical system during EIS?

Working electrode (WE) Signup and view all the answers

What does E(t) represent in the context of EIS measurements?

Potential difference between electrodes Signup and view all the answers

Which term describes the resistance encountered by ions moving through the electrolyte in an electrochemical system?

Solution resistance Signup and view all the answers

What is the essential prerequisite for the development of amperometric biosensors with high sensitivity and fast response characteristics?

Establishing a fast electron transfer from the biological component to the electrode Signup and view all the answers

In amperometric biosensors, what happens to the redox species in the sensing layer?

They are oxidized or reduced at the transducer surface Signup and view all the answers

What happens to an element or atom in a compound when it is oxidized?

It reacts with oxygen Signup and view all the answers

Why is a fast electron transfer important in biosensors?

To improve sensor accuracy and response speed Signup and view all the answers

What role do redox species play in generating a current through the electrode in biosensors?

They are oxidized or reduced at the transducer surface, leading to current flow Signup and view all the answers

How does establishing a stable potential impact current flow in biosensors?

It hinders electron transfer and reduces current flow Signup and view all the answers