Figure 5: High-energy X-ray scattering and experimental PDF data.
From: The critical role of point defects in improving the specific capacitance of δ-MnO2 nanosheets
(a) I(Q) and (b) F(Q) for the pH=2 and pH=4 treated MnO2 nanosheets assemblies, and (c) G(r) for the pH-treated samples, protonated MnO2 (HxMnO2), and parent phases (KxMnO2). The basal reflections evident in I(Q<2 Å−1) indicate a measure of restacking. The variation in intensity as a function of pH indicates a variation in the interlayer structure attributable to either surface water or Mn. The inverse trends in the Mn–Mn peak (2.89 Å) and Mn–MnIL peak (3.45 Å) as a function of pH support the Mn3+ displacement model recommended by Manceau et al.30
