PGSTAT101 Electrochemical Workstation by Metrohm Autolab

Overview

The PGSTAT101 Electrochemical Workstation by Metrohm Autolab is a compact, non-modular, single-channel potentiostat/galvanostat engineered for precision electrochemical measurements in academic laboratories, teaching environments, and applied research settings requiring high-fidelity low-current performance. Based on a robust analog front-end architecture with a 1 MHz potentiostat bandwidth and sub-250 ns transient response, it implements classical three-electrode potentiostatic control while supporting two- and four-electrode configurations for specialized applications such as corrosion monitoring or high-impedance biosensor interfaces. Its core measurement principle relies on real-time feedback-controlled current sourcing and potential sensing, with hardware-level integration of a coulometric integrator enabling direct charge quantification without post-acquisition numerical integration—critical for chronoamperometry, chronocoulometry, and pulse techniques where baseline stability and charge fidelity are paramount.

Key Features

• Ultra-low-noise current measurement down to 10 nA full-scale, with 30 fA resolution achieved via optimized transimpedance amplifier design and guarded signal routing
• Dual-resolution potential control: 150 µV step resolution for stimulus generation; selectable 3 µV / 30 µV / 300 µV resolution for high-dynamic-range potential acquisition
• Built-in analog coulometric integrator with >4 MHz bandwidth and input impedance exceeding 100 GΩ || <8 pF, minimizing capacitive loading and drift during long-duration charge integration
• Real-time iR compensation using both positive-feedback and current-interrupt methods, configurable per experiment to correct for uncompensated solution resistance without destabilizing the control loop
• Integrated analog I/O interface (16-bit DAC/ADC) enabling synchronized external signal control—e.g., coupling with temperature controllers, flow cells, or optical detectors for multimodal experiments
• Hardware-supported electrochemical simulation circuitry, allowing users to validate instrument response using built-in Randles cell models prior to physical cell connection

Sample Compatibility & Compliance

The PGSTAT101 supports standard electrochemical cell geometries including conventional three-electrode beaker cells, microelectrode arrays, screen-printed electrodes, and flow-through electrochemical cells. Its high input impedance (>100 GΩ) and sub-picoampere bias current (<1 pA at 25°C) ensure minimal interference when characterizing high-impedance biological interfaces (e.g., lipid bilayers, enzymatic biosensors) or insulating coatings. The system complies with CE marking requirements and adheres to ISO 9001 quality management standards in design and manufacturing. When operated with NOVA software under validated configurations, it supports audit-trail logging, electronic signatures, and user-access controls aligned with GLP and FDA 21 CFR Part 11 principles—making it suitable for regulated educational labs and pre-clinical assay development.

Software & Data Management

Control and analysis are exclusively performed using NOVA software (v2.1 or later), a Windows-native application developed by Metrohm Autolab specifically for electrochemical instrumentation. NOVA provides experiment scripting via intuitive graphical method editors, real-time data visualization with multi-curve overlay, and batch processing for standardized protocols such as cyclic voltammetry series or EIS spectra. All raw data—including timestamps, instrument metadata, and parameter settings—are saved in proprietary .DTA format with embedded checksums for integrity verification. Export options include CSV, ASCII, and MATLAB-compatible binary formats. For laboratory information management systems (LIMS), NOVA supports ODBC connectivity and can generate PDF reports with digital signatures and version-controlled templates compliant with internal SOPs.

Applications

• Electroanalytical teaching: Designed for undergraduate and graduate laboratories, offering intuitive setup for fundamental techniques including cyclic voltammetry, linear sweep voltammetry, chronoamperometry, and electrochemical impedance spectroscopy
• Biosensor development: Enables stable amperometric detection of redox-active biomolecules (e.g., glucose oxidase, dopamine, H₂O₂) with sub-picoampere sensitivity and minimal background drift
• Medical device testing: Used in evaluating electrode materials for implantable sensors, assessing passivation layer stability, and validating charge injection capacity in neural stimulation interfaces
• Corrosion science: Supports Tafel analysis, polarization resistance, and electrochemical noise measurements on coated metals and alloys in simulated physiological or industrial electrolytes
• Fundamental kinetics studies: Facilitates digital simulation-assisted analysis of electron-transfer rates, coupled chemical reactions (EC, CE mechanisms), and diffusion-controlled processes via forward modeling in NOVA

FAQ

Is the PGSTAT101 compatible with third-party software?
No—hardware communication is exclusively supported through Metrohm Autolab’s NOVA software suite. API access or SCPI command sets are not provided.
Can the PGSTAT101 perform electrochemical impedance spectroscopy (EIS)?
Yes, it supports single-sine and multi-sine EIS up to 1 MHz, with frequency resolution down to 0.001 Hz and phase accuracy better than ±0.3° within its specified bandwidth.
What electrode configurations does it support?
It natively supports two-electrode (potentiostatic mode), three-electrode (standard potentiostat), and four-electrode (separate current-sensing leads) configurations via dedicated terminal assignments.
Does it include hardware-based IR compensation?
Yes—both positive-feedback and current-interrupt iR compensation are implemented in analog circuitry and can be activated or tuned independently per experiment.
Is the built-in coulometric integrator suitable for quantitative charge analysis in battery cycling studies?
While optimized for analytical electrochemistry and sensor calibration, the integrator meets ASTM E2053-20 specifications for coulometric accuracy; however, extended-cycle battery testing is better served by dedicated battery cyclers with higher current compliance and thermal management.