Why is the calculated capacitive contribution k-value consistently 99% for scan rates from 5 mV s⁻¹ to 30 mV s⁻¹?
A calculated capacitive contribution of 99% at low scan rates almost certainly stems from flaws in the fitting procedure or data selection, rather than the material truly exhibiting near-pure capacitive behavior. The Dunn method is extremely sensitive to data quality at low scan rates, and a common systematic error can artificially inflate the result to … Read more