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Electrical stimulation with Pt electrodes. VIII. Electrochemically safe charge injection limits with 0.2 ms pulses
1Research Division, EIC Laboratories, Norwood, MA 02062.
IEEE Transactions on Bio-Medical Engineering
|November 1, 1990
Summary
Platinum electrodes have lower charge injection limits than previously thought. New findings show limits are 50-150 microC/cm2, three to ten times smaller for biphasic current pulses.
Area of Science:
- Electrochemistry
- Materials Science
Background:
- Determining charge injection limits is crucial for electrochemical device performance.
- Previous studies utilized longer pulse widths and fully exploited surface reactions.
Purpose of the Study:
- To investigate the charge injection limits of platinum (Pt) electrodes.
- To establish new limits under specific current pulse conditions.
Main Methods:
- Utilized 0.2 ms charge-balanced, biphasic current pulses.
- Monitored potential excursions to prevent hydrogen (H2) or oxygen (O2) production.
Main Results:
- Charge injection limits ranged from 50 to 150 microC/cm2 (geometric).
- These values are 3-10 times lower than previously accepted values.
- Limits were determined by preventing H2/O2 evolution.
Conclusions:
- The effective charge injection capacity of Pt electrodes is lower than commonly assumed.
- Optimized pulse parameters are critical for accurate determination of electrode charge limits.