Units & acquisition order
Potential: V; time: s; EIS frequency: Hz; impedance: Ω. Choose current units explicitly. CV preserves acquisition order and separates scan reversals. GCD analysis requires one segment with increasing time.
Equivalent-circuit fitting does not automatically validate a physical mechanism. Verify measurement stationarity, linearity, residuals and model identifiability.
Analysis overview
Imported data worksheet
100-row pages show every imported row. Search affects the preview only. Blank/non-numeric measurement rows are reported or rejected according to the selected method.
Primary analysis plot
Diagnostic plot
Distribution / residuals
Additional results
Workflow, methods and limitations
- Import data or load a labeled synthetic example.
- Review the worksheet, header setting, columns and physical units.
- Choose method controls and run the analysis.
- Inspect numerical tables, plots, exclusions and method assumptions.
- Export the settings with the results for reproducibility.
CV reports extrema per scan branch, branch charge and an apparent branch capacitance using constant scan rate. It does not automatically pair redox peaks, remove capacitive backgrounds or infer diffusion coefficients. Electrochemical area/mass normalizations require meaningful experimental definitions.
GCD integrates constant-current charge and I V dt energy over the selected time range, then reports capacity, mass/area-normalized capacitance, specific energy and average power. Select a single valid segment and terminal voltage. IR-drop correction, ESR and cycle efficiency are not automatically inferred.
Tafel fits E against log10(|I|/area) within the selected potential range. Choose an activation-controlled region on one branch. No automatic corrosion-current extrapolation, reference conversion or iR correction is performed.
EIS fits Rs+(Rct∥C) or Rs+(Rct∥CPE) using positive log-parameter coordinate search. It reports real/imaginary residuals and fit error. This local optimizer provides no covariance confidence intervals or global-optimum guarantee. CPE Q is not capacitance unless n=1. No Warburg/diffusion models or Kramers–Kronig validation are included.
Reference: Gamry EIS fundamentals.
Uploaded measurements are processed locally. Native proprietary instrument files, PDF/image extraction and calibrated medical analysis are not supported. Excel formulas use stored values. Host over HTTP/HTTPS because computation uses workers. Reloading clears the session.