Elec­tro­an­a­lytics

Description of the method

Various electrochemical methods are available:

• In cyclovoltammetry,the voltage at an electrodeiscyclically varied and the resulting current is measured. This produces a characteristic current-voltage diagram (cyclovoltammogram), which provides information about redox processes.
• Chronopotentiometry: In this method, a constant current is applied through an electrochemical cell and the resulting potential is measured over time.
• Chronoamperometry: A constant potential is applied (usually as a step from one value to another) and the resulting current is measured over time.
• Electrochemical Impedance Spectroscopy (EIS):In this technique, a small sinusoidal alternating voltage with a variable frequency is applied and the impedance (complex resistance) of the system is measured. This provides information about resistances, capacitances and other processes within the system.

Examples of applications

Cyclovoltammetry

• Determination of redox potentials and electron transfer kinetics
• Investigation of electrode processes and reaction mechanisms
• Characterisation of batteries, fuel cells and corrosion processes
• Development of electrochemical sensors

Chronopotentiometry

• Determination of diffusion coefficients
• Investigation of reaction mechanisms
• Analysis of the kinetics of electrochemical processes

Chronoamperometry

• Investigation of diffusion processes
• Determination of electrode reaction rates
• Sensor technology
• Corrosion studies
• Characterisation of catalytic surfaces

Electrochemical impedance spectroscopy (EIS)

• Corrosion research
• Coating characterisation
• Biosensors
• Investigation of interfacial processes

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