fig2

Figure 2. Characterizations of the synthesized MoO_x nanobelts, MoO_x/CNTs and AC/CNTs electrode. (A and B) TEM image (A) and the corresponding SAED pattern (B) of MoO_x nanobelt; (C-E) SEM image (C) and elemental mapping images (D-E) of MoO_x nanobelt; (F-H) XPS spectra of MoO_x nanobelts; (I and J) I-V curves of MoO_x/CNTs electrode under different bending angles (I) and being bent to 135° for different cycles (J). Inset in (I) is the photograph by a digital camera of a bending MoO_x/CNTs electrode; (K and L) I-V curves of AC/CNTs electrode under different bending angles (K) and being bent to 135° for different cycles (L). Inset in (K) is digital photograph by a digital camera of AC/CNTs electrode; (M and N) SEM images of MoO_x/CNTs (M) and AC/CNTs (N) electrode before and after bent to 135° for 3,000 cycles. CNTs: Carbon nanotubes; AC: active carbon; TEM: transmission electron microscopy; SAED: selected area electron diffraction; SEM: scanning electron microscopy; XPS: X-ray photoelectron spectroscopy; I-V: current-voltage.