Water Plasma Functionalized CNTs/MnO₂ Composites for Supercapacitors

Figure 4

XPS spectra of Mn 2p and O1s (a) wpCNTs/MnO₂ (75 W, 135 Pa) before cycling (b) wpCNTs/MnO₂ (75 W, 135 Pa) after 2000 cycles (between 0-1 V), and (c) wpCNTs/MnO₂ (75 W, 135 Pa) after 2000 cycles (between 0.1–0.8 V).

(a)

(b)