## 3 Results and Discussion
### Long-Term Stability of Switching Characteristics  
Response times \(t_{\mathrm{col}}\) and \(t_{\mathrm{bleach}}\) (Table 9) corresponding to the time needed to color or bleach, respectively, the films to 90% of \(\Delta T_{710\mathrm{nm}}\) ([PERSON] et al., 2017; [PERSON] et al., 2017) were calculated from the transmittance curves (Figure 9, Figure 10, Figures S12 and S13). \(t_{\mathrm{col}}\) shorter than 6 s were consistently achieved for all films speaking in favor of a generally fast intercalation. However, rather long \(t_{\mathrm{bleach}}\)\(>\) 40 s was determined for WO\({}_{3\,|}\)comp, WO\({}_{3\,|}\)mp and commWO\({}_{3}\) whereas the WO\({}_{3\,|}\)up400, WO\({}_{3\,|}\)up600 and WO\({}_{3\,|}\)up were bleached within \(t_{\mathrm{bleach}}\)\(<\) 25 s with short response times of just 2-3 s obtained for some samples. This tendency is again in conformity with the study of [PERSON] et al. (2017), where response times of \(t_{\mathrm{col}}\) ca. 20-30 s and \(t_{\mathrm{bleach}}\) ca. 70 s were observed for samples similar to WO\({}_{3\,|}\)mp. Despite higher \(\Delta T_{710\mathrm{nm}}\) for the commercial WO\({}_{3}\) film (Figure S12d), the short bleaching times of the films with micropores confirmed a facile switching of these films (Figure 9, Figure 10, Figures S12 and S13). The trend of \(t_{\mathrm{bleach}}\)\(>\)\(t_{\mathrm{col}}\) for all films fits to the slower transmittance change during positive scans in CV (Figure 6b) and \(D_{c,\mathrm{CV}}\)\(>\)\(D_{a,\mathrm{CV}}\) (Table 7). While the intercalation of Li\({}^{+}\) into all presently studied films is fast, their extraction is slow for compact films (WO\({}_{3\,|}\)comp and commWO\({}_{3}\)) and for WO\({}_{3\,|}\)mp with remaining polymer fragments. By using PEG 400, PEG 600 or both, PIB50-b-PEO45 and PEG 600 as additives, micropores were created that provide pathways for fast deintercalation of the ions. Figure 8: Transmittance spectra of 646 nm thick WO\({}_{3\,|}\)comp (black), 702 nm thick WO\({}_{3\,|}\)up600 (green) and 620 nm thick WO\({}_{3\,|}\)up (red) films measured in contact to LiClO\({}_{4}\) in PC at a scan rate of 5 M s\({}^{-1}\) in the initial states (init. ), the bleached (1 V) and the colored (\(-\)1 V) states at the second cycle. The corresponding calculated color impressions are shown to the right. Figure 10: Optical transmittance at 710 nm of (**a**) WO\({}_{3|}\)comp and (**b**) WO\({}_{3|}\)up600 in LiClO\({}_{4}\) in PC, recorded during chronoamperometry with 50 cycles between \(-1\) V applied for 60 s and 1 V applied for 100 s. The arrow in (**a**) indicates the shift of the transmittance to higher values. The insets show the calculated color impressions at the 4. And the 53. Cycle of the films at the colored states. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Film Type** & **\(\mathbf{t_{\text{col}}/s}\)** & **\(\mathbf{f_{\text{bleach}}/s}\)** & **\(\mathbf{t_{\text{col}}/s}\)** & **\(\mathbf{f_{\text{bleach}}/s}\)** \\  & **(300 s)** & **(300 s)** & **(60 s)** & **(100 s)** \\ \hline WO\({}_{3|}\)comp & 4.5 & 129.0 & 5.1 & 48.8 \\ WO\({}_{3|}\)up400 & 5.2 & 10.4 & 9.1 & 23.2 \\ WO\({}_{3|}\)up600 & 4.8 & 14.1 & 5.5 & 17.1 \\ WO\({}_{3|}\)up & 5.1 & 160.6 & 4.6 & 43.6 \\ WO\({}_{3|}\)up & 1.7 & 1.7 & 1.7 & 1.5 \\ commWO\({}_{3}\) & 4.1 & 148.4 & - & - \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Response times \(t_{\text{col}}\) and \(t_{\text{bleach}}\) of the different films obtained from CA measurements after prior opposite polarization for either 60 s, 100 s, or 300 s.  
Figure 9: Optical transmittance at 710 nm of (**a**) WO\({}_{3|}\)comp and (**b**) WO\({}_{3|}\)up in LiClO\({}_{4}\) in PC, recorded during chronoamperometry between the potentials depicted as dashed profiles. The insets show the calculated color impressions of the films at the first and the third cycle at the colored states. A tendency of smaller \(CE_{710\mathrm{nm}}\) was revealed in CA compared to CV (Table 8).