Further oxidation of PB to BG was facile, with rapid K + deintercalation and a strong simultaneous current response. Given that little difference in defect structure has been demonstrated for HC-PB and LC-PB, these differences are attributed to variation in composite film microstructure seen by SEM (Figure ), as reported by Zampardi et al. From the XANES analysis, it is evident that K + is almost completely deintercalated from PB, with the remaining K + that is seen after the current response attributed with the electrolyte. Therefore, while the high spin redox process appears to be incomplete (i.e., K + is not completely converted from a PB environment to a PW one), the K + removal during low spin PB to BG is far more favorable and goes to completion. The subsequent intercalation of K + from BG to PB also appears facile, although observation of the total edge step shows that significantly less K + is present within the sample after the low spin redox process, in agreement with the reduced current response (i.e., K + signal at the two relevant current response plateaus). Finally, unlike during oxidation, the intercalation of K + during PB reduction to PW corresponds to a clearly observable current response, indicating that this process is faradaic in nature.