“…Fe 2p3/2 peak can be deconvoluted into four components, which are located at 705.1, 709.5, 712.5, and 715.9 eV, as shown in Figure 9. These components correspond to metallic Fe, Fe 2+ , Fe 3+ , and satellite peak [25,26]. The table in Figure 9 describes the relative content of metallic Fe, Fe 2+ , and Fe 3+ , which is calculated based on the area of the deconvoluted peaks.…”