Operando XANES of LC-PB (Figure & Figure ) revealed significantly different behavior to HC-PB. Starting from -0.2 V of the 2 nd CV cycle, a very low current response is seen when sweeping the potential between 0.1 to 0.5 V. The lack of current response suggests minimal oxidation of species, either due to minimal PW being formed from the preceding PB reduction or a lack of oxidation of PW. Interestingly, XANES analysis of K + speciation shows that ca. 20% of K + was already within a PB environment at -0.2 V, partially explaining the low current response. However, the remaining ca. 80% of K + was present within a PW environment and the deintercalation of the K + from the PW environment is clearly observed during the oxidative potential sweep. The rate of deintercalation from PW was incredibly sluggish, with considerable K + being retained in LC-PB up to 0.8 V (i.e., within PW) and no clear plateau of K + concentration exists. Surprisingly, the deintercalation process shows minimal current response, suggesting a non-faradaic chemical process is responsible for a significant proportion of the PW deintercalation.