Figure 3. (a) TEM diagram of ZMOP-4; (b-f) Mn, O, N, Zn element distribution diagram of ZMOP-4
In Figure 4b , the detailed molecular framework of the ZMOP-x composites was conducted by FTIR. It can be seen that the different amount of PPy mainly affects the peak position of 1120 cm-1. Among them, when there is no or little content of PPy was added, the formation of the peak couldn’t be seen at the peak of 1120 cm-1. With the increasing amount of PPy, ZMOP-4, and ZMOP-6 samples have weak peaks at the position of 1120 cm-1, indicating that the C-N tensile vibration strength of these two ratios is relatively high. Further indicating that the appropriate addition of PPy has a favorable impact on the electrode material to promote the transport and diffusion process of Zn2+, and benefits by offering more active points to increase the Zn2+ storage.23,24 In Figure 4b, the peak for the C=C/C-C skeleton vibration is observed at 1630 cm-1, while the C-H in-plane vibration peak appears at 1400 cm-1. And peaks at 978 cm-1 are owed to the N-H out-of-plane deformation vibration. Furthermore, the peaks at 718 cm-1 and 530 cm-1 correspond to the tensile vibrations of Mn-O-Mn and Mn-O.25 All these peaks are indicative of the molecular structure of PPy and α-MnO2, demonstrating the effective preparation of the ZMOP composites at a microscopic level.26