Model CHI700E Series Bipotentiostat

Overview

Overview

The Model 700E series are computerized general-purpose potentiostat / bipotentiostat / galvanostat instruments. A typical application involves a rotating ring-disk electrode (RRDE), but these systems can also be used for other applications where dual channel measurements are essential, such as dual channel electrochemical detection. The system contains a fast digital function generator, a direct digital synthesizer for high frequency ac waveforms, high speed dual channel data acquisition circuitry, (bi)potentiostat, and a galvanostat (only available in select models). The potential control range is 10 V and the current range is 250 mA. The instrument is capable of measuring current down to tens of picoamperes. The steady state current of a 10 μm disk electrode can be readily measured without external adapters. With the CHI200B Picoamp Booster and Faraday Cage (fully automatic and compatible with the 700E series), currents down to 1 pA can be measured (primary current channel only). These instruments are very fast. The function generator can update at a 10 MHz rate. Two high speed and high resolution data acquisition channels allow both current channels or current and potential (or external voltage signal) to be sampled simultaneously at 1 MHz rate at 16-bit resolution. The instrument provides a very wide dynamic range on experimental time scales. For instance, the scan rate in cyclic voltammetry can be up to 1000 V/s with a 0.1 mV potential increment or 5000 V/s with a 1 mV potential increment. The potentiostat / galvanostat uses a 4-electrode configuration, allowing it to be used for liquid/liquid interface measurements and eliminating the effect of the contact resistance of connectors and relays for high current measurements. The data acquisition systems allow an external input signal (such as spectroscopy signals to be recorded simultaneously with electrochemical data). The instrument will also automatically re-zero both potential and current, so that periodic re-calibration of the instrument can be avoided.

The 700E series shares many common features with the 600E series. When used as a single channel potentiostat, the instrument is identical to the model 600E series. The bipotentiostat is realized by adding the second channel potential control and current measurement board to the model 600E series. There are also two filter stages, three extra gain stages, and channel selection circuitry on the board. When it is used as a bipotentiostat, the second channel can be controlled at an independent constant potential or to scan/step at the same potential as the first channel. In case of CV, it can also scan with a constant potential difference with the first channel. Techniques available for the second channel include CV, LSV, SCV, CA, DPV, NPV, SWV, and i-t.

The 700E series is the upgrade to our very popular 700/700A/700B/700C/700D series. The major improvements of this series are very stable and accurate potential and current control, and dual channel data acquisition at high speed.

The 700E series has a USB port (default) and a serial port for data communication with the PC. You can select either USB or serial (but not both) by changing a switch setting on the rear panel of the instrument.

The 700E series also has a true integrator for chronocoulometry.

Two 16-bit highly stable bias circuits are used for current and potential bias, allowing wider dynamic range in AC measurements. These can also be used to re-zero the DC current output.

The instrument is capable of a wide variety of electrochemical techniques, and is available with integrated simulation and fitting software functions for both impedance and cyclic voltammetry. These features provide powerful tools for both electrochemical mechanistic studies and trace analysis.

We provide several different models in the 700E series. The model comparison table compares the different models. Other than what is listed, the specifications and features of these models are identical. Models 700E and 710E are basic units for mechanistic study and electrochemical analysis, respectively. Models 720E and 730E are comprehensive electrochemical analyzers. Model 750E and 760E are advanced electrochemical workstations.