This webinar demonstrated the application of ZP’s screen-printed electrodes (SPEs) and potentiostat for electrochemical impedance spectroscopy (EIS). The presenter conducted two key experiments:
EIS on Ferricyanide Solution – Using a 501 carbon SPE and 5 mM ferricyanide, EIS was performed (1 Hz–100 kHz, 10 mV AC amplitude, 200 mV DC potential). The Nyquist plot showed a semicircle (charge transfer) and linear diffusion component, illustrating fundamental EIS principles. Data was automatically uploaded to Djuli, ZP’s cloud platform, for real-time analysis.
Cyclic Voltammetry (CV) for Potential Selection – Prior to EIS, CV scans (-200 mV to 600 mV, 100 mV/s) identified the half-wave potential (~200 mV), used as the DC bias in EIS. The cloud-enabled potentiostat streamlined data collection and analysis, emphasizing reproducibility and low-cost development.
Key Takeaways:
-
SPEs enable accessible EIS for teaching/R&D without expensive materials (e.g., gold/platinum).
-
Integrated workflows (QR codes, cloud analytics) simplify transitioning from CV to EIS.
-
Djuli platform ensures secure, AI-ready data storage and processing.