McEvoy Todd M, Stevenson Keith J
Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, USA.
J Am Chem Soc. 2003 Jul 16;125(28):8438-9. doi: 10.1021/ja035370c.
A new integrated electrochemical and transmission optical microscopy approach is presented which allows for elucidation of inhomogeneous ion/charge-transfer behavior in polycrystalline electrochromic/insertion materials. Spatially resolved Li+ diffusion coefficients and ionic conductivities are determined from the time-lapsed optical density imaging response monitored during electrochemical potential-step perturbation. Non-uniform coloration changes and dispersed insertion kinetics are observed and associated with domain specific reactivity of polymorphous materials comprising alpha-MoO3 and beta-MoO3.
