Question

under CV or LSV measurements, the peak current is the sum of the faradaic current and non-faradaic current. A one –electron transfer redox reaction occur on a platinum electrode of area 1 cm2. Do = 10-5 cm2/s Co*= 5mM and Cd = 20µF/cm2 are for the reaction.

a) At the scan rate of 10mV/s, calculate the faradaic current of peak current. (3%)

b) under the above situation, calculate the non-faradaic current. (3%)

c) What is the ratio of ‘the faradaic current’ to ‘the non-faradaic current’? (3%)

d) if the scan rate is increased to 100 mV/s, what is the ratio of ‘the faradaic current ‘to ‘non-faradaic current’?

Answer 1

The results show that, out of a wide temperature range covering from 200 °C to 500 °C, there is a two-phase temperature-dependent growth, explained by the Stranski–Krastanov and self-catalytic vapor–liquid–solid (VLS) methods, and, on the other hand, that there is an optimal growth temperature at 300 °C that maximizes the electroactive surface area and sensitivity.