fig6

Figure 6. (A) Typical GCD profile of the electrode; Ex-situ analyses of XRD patterns at the selected points of (B) PPy-NaVO; (C) Enlarged view of the (001) diffraction peak; (D and E) Ex-situ XPS analyses; (F) Schematic illustration of the electrochemical storage process. GCD: Galvanostatic charge-discharge; XRD: X-ray diffraction; XPS: X-ray photoelectron spectroscopy; ZVO: Zn₃(OH)₂V₂O₇·2H₂O; BZS: basic zinc salt; PPy-NaVO: polypyrrole-pillared Na₂V₆O₁₆.