Fig. 4
From: Rechargeable aqueous zinc-manganese dioxide batteries with high energy and power densities
XAS characterization of β-MnO2 electrode. a Mn-K edge XANES curves at selected discharge/charge states, with reference to standard MnO, Mn2O3, and Mn3O4. b Fitted linear relationship between the photon energy and oxidation state of Mn element. c The EXAFS spectra. d Schematic depiction of the unit cell of β-MnO2
