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Electrical stimulation with Pt electrodes. VIII. Electrochemically safe charge injection limits with 0.2 ms pulses (neuronal application)

1990; Institute of Electrical and Electronics Engineers; Volume: 37; Issue: 11 Linguagem: Inglês

10.1109/10.61038

1558-2531

Timothy L. Rose, Lois S. Robblee,

Electrochemical Analysis and Applications

For pt.VII see J. Neurosci. Methods, vol.9, p.301-8 (1983). The charge injection limits of a Pt electrode using 0.2 ms charge balanced, biphasic current pulses range from 50 to 150 mu C/cm/sup 2/ geometric if the potential excursions of the electrode are kept below those at which H/sub 2/ or O/sub 2/ are produced. These charge densities are three to ten times smaller than the currently accepted value based on earlier experiments in which the reversible surface reactions were fully utilized and the pulse widths were longer. Several qualifying comments are made regarding the experimental results. >