Published online by Cambridge University Press: 28 February 2011
Nickel oxide sputtered electrodes can undergo a reversible lithium intercalationdeintercalation process which is accompanied by a net electrochromic effect. The characteristics of this type of electrode and the mechanism of the related electrochromic process are discussed on the basis of results obtained by cyclic voltammetry and optical transmittance. The results show that nickel oxide is electrochromically activated by insertion of lithium in the oxide structure. The lithium intercalation process may be promoted by cyclic voltammetry or, more extensively, by polarizing cathodically the nickel oxide electrode in a non-aqueous electrolyte containing a lithium salt. Activated nickel oxide electrodes are of considerable interest for the realization of new types of efficient solid state electrochromic windows..