The mysterious case of the CPE

In my previous article I explained how a ‘convolution integral’ can be used to simulate a constant phase element (abbreviation ‘CPE’, symbol ‘Q’) in the time domain. This is useful, but there is much more to this simple element than meets the eye. Specifically, when combined with a series resistance to form a very basic … Read more

Constant Phase Elements

In electrochemistry it is common to come across behaviour that can only be modelled using a constant phase element (CPE). For example, a measurement taken using electroimpedance spectoscopy (EIS) often produces a flattened or depressed semi-circle on a Nyquist plot. This indicates that a form of capacitance is present (coupled with a resistance), but it … Read more

UK new car ban extended to include hybrids

The UK Government has announced that the date from which the sales of all new petrol and diesel cars and vans will be banned is being brought forward by 5 years, from 2040 to 2035. This is good news, but not particularly surprising, since the government has also committed to being carbon neutral by 2050. … Read more