Abstract
The electrochromic behavior of 
has been studied by potentiostatic and galvanostatic measurements for both symmetric and asymmetric cells. The kinetics of coloration and bleaching are ascribed to barrier‐limited and space charge‐limited current flow, respectively, similar to the case of 
. Galvanostatic measurements indicate linearity of optical density with injected charge at low injection levels. At high injection levels a nonlinear response is observed which is attributed to the approach of a phase boundary with increasing
in 
. A general comparison of 
and 
in 
indicates greater stability for open‐circuit memory of the 
cells. Response times for various symmetric cells are tabulated.