Epsilon EClipse™ Electrochemical Workstation

Electrochemical Techniques - Basic

Cyclic Voltammetry/Linear Sweep Voltammetry

• The most common voltammetric technique for characterizing new redox systems
• Excellent for studying electrochemical and chemical kinetics
• Step height (DAC resolution): 100 µV
• Scan rate: 1 mV/s - 25 V/s
• Optional DigiSim software for digital simulation
• DigiSim text file format
• Measurement of peak potential and current with automatic or manual definition of baseline

Chronoamperometry/Chronocoulometry

• Excellent technique for measuring diffusion coefficients and electrode surface area
• Single or double potential step (equal or unequal step times)
• Step time: 1 ms - 65 s
• Resolution > 20µs
• Digital integration of current for charge vs. time
• Cottrell plot (i vs. t^-1/2): slope, intercept, and correlation coefficient, with automatic or manual definition of line
• Anson plot (Q vs. t^1/2): slope, intercept, and correlation coefficient, with automatic or manual definition of line

Controlled Potential Electrolysis

• Used to calculate the number of electrons transferred/molecule or the amount of material present
• Data acquisition up to 20 points/s and high resolution 20-bit data
• Automatic termination at user-defined time, minimum current, total charge, or initial/final current ratio

DC Potential Amperometry

• Basis of most FIA and LC detectors
• Ideal for sensor research and development and amperometric titrations
• Data acquisition up to 20 Hz and high resolution 20-bit data

Open Circuit Potential vs. Time

• Potential resolution: 20 µV
• Data acquisition up to 20 points/s and high resolution 20-bit data

Chronopotentiometry

• Potential resolution: 20 µV
• Data acquisition up to 20 points/s and high resolution 20-bit data

  Methods Option

 Sequential Techniques

• Prepare sequences with an unlimited number of techniques 
• Insert trigger and delays in sequence
• Repeat sequence up to 9999 times

Electrochemical Techniques - Bi-Potentiostat Option

Amperometry

• Constant potential amperometry on two channels
• Data acquisition up to 20 Hz and high resolution 20-bit data

Cyclic Voltammetry

• Scan potential on Channel 1 and hold potential on Channel 2
• Scan both channels over the same potential range at the same scan rate

Chronoamperometry

• Step Potential on channel 1 and hold potential on channel 2
• Step both channels to the same potentials
• Step time: 1 ms - 65 s
• Resolution: > 50 µs

Electrochemical Techniques - Basic Plus Option

Sampled Current Polarography

• Common technique for quantitative analysis
• Easy to change step height, step width, and current sampling parameters
• Step height: 1 - 40 mV

Normal Pulse Voltammetry/Polarography

• Common technique for quantitative analysis
• Easy to change pulse width, period (drop time), and current sampling parameters
• Pulse width: 3 - 2000 ms

Differential Pulse Voltammetry/Polarography

• Popular technique for quantitative analysis
• Easy to change pulse width, period (drop time), and current sampling parameters
• Pulse width: 3 - 1000 ms
• Measurement of peak potential, current, and area with automatic or manual definition of baselines

Square Wave Voltammetry

• Fastest of the common quantitative analysis techniques
• Excellent detection limits
• User-defined frequency, amplitude, and current sampling parameters
• Square wave frequency: 1 - 2000 Hz
• Measurement of peak potential, current, and area with automatic or manual definition of baselines

Stripping Voltammetric Techniques

• Combination of deposition (preconcentration) step followed by voltammetric (stripping) step
• Linear sweep, differential pulse, and square wave voltammetries available for stripping step
• Technique of choice for determining trace concentrations (10^-9 M - 10^-11 M) or metal ions, anions, and adsorbates
• Capable of anodic, cathodic, and adsorptive stripping determinations
• Measurement of peak potential, current, and area with automatic or manual definition of baselines

Double Potential Step Chronopotentiometry

• Minimum step time: 1 ms
• Current range: +/- 32 mA
• Resolution: > 20 µs