The Double Layer at Capacitor Electrode Interfaces: Its Structure and Capacitance

Abstract

As indicated in Chapter 1, electrochemical capacitors are principally based on two types of capacitative behavior: (1) one associated with the so-called double layer at electrode interfaces and (2) another associated with the pseudocapacitance that is developed in certain kinds of electrode processes where the extents of charge passed (q) (up to some limit) are some function of potential (V) so that a derivative dq/dV arises that is electrically equivalent to a capacitance. This is commonly termed a “pseudocapacitance,” C φ , (Chapter 10) and is also experimentally measurable as a capacitance.