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Potentiostats are control and measurement devices designed to output a controlled potential. Unlike other voltage sources, potentiostats contain feedback circuitry between the output and measured potential. This enables them to maintain a set potential through a circuit with varying resistance by increasing or decreasing the output, ensuring that the measured potential remains constant as per Ohm's Law.
Potentiostatic experiments such as cyclic voltammetry use a three electrode system consisting of a working electrode, a counter electrode, and a reference electrode. These are placed in an electrochemical cell containing the electrolyte solution and a reference solution. During a measurement, the potential of the reference electrode remains fixed while the potentiostat varies the potential of the working electrode. The counter electrode completes the circuit and allows current to flow, counteracting the redox events taking place at the working electrode due to electrochemical reactions in the cell, and ensuring that no current passes between the reference and working electrodes.
Potentiostat Specifications
Potential range | ±7.5 V |
Potential compliance | ±10 V |
Applied potential accuracy | ±10 mV offset |
Applied potential resolution | 333 µV |
Maximum current | ±200 mA |
Current ranges | ±20 μA to ±200 mA (5 ranges) |
Current measurement accuracy | ±20 nA offset (at 20 μA range) |
Current measurement resolution | 5 nA (at 20 μA range) |
Communication | USB-B |
Overall Dimensions | Width: 125 mm Height: 55 mm Depth: 175 mm |
Weight | 600 g |
Standard Electrochemical Cell Glassware (Optional)
Screw-fit PTFE lid with 3-electrode holes and 2-gas holes.
Platinum Disk Working Electrode (Optional)
Highly polished platinum embedded in polytetrafluoroethylene (PTFE) plastic bodies.
All dimensions are in millimetres.
Purity | 99.99% |
Diameter | 2 mm |
Platinum Wire Counter Electrode (Optional)
All dimensions are in millimetres.
Purity | 99.99% |
Diameter | 0.5 mm |
Non-aqueous Ag/Ag+ Reference Electrode (Optional)
All dimensions are in millimetres.