By comparison, LC-PB analyzed prior to addition of electrolyte, or an applied voltage, shows subtle difference in K + speciation (Figure ). Linear combination fitting (LCF) allows assignment of 68% K + within a comparable environment to HC-PB, and 32% adsorbed K + in a solvated environment. Subsequently, the structural formula determined by elemental analysis can be revised to K 0.71 Fe[Fe(CN) 6 ] 0.94 .4.1H 2 O + 0.33K + (ads) . Introduction of electrolyte results in the XANES spectrum of LC-PB changing to that seen for HC-PB, which shows the removal of adsorbed K + from the PB surface. At the same voltages of -0.1 V, 0.4 V, and 0.9 V that were applied to HC-PB, potassium XANES of LC-PB gives comparable pre-edge positions, main feature splitting, and extended structural features for K + in PB, PW and electrolyte environments, as seen for HC-PB (Figure ). Interestingly, these results show that the local environment of K + is comparable in both samples after residual K + (ads) is washed from the surface by the aqueous solvent. This observation correlates to information from the framework perspective, as provided by Fe K-edge XAS and 57 Fe Mössbauer, which showed similar structural order and defect formation in both samples.