Synthesis and Characterization of Birnessite and Cryptomelane Nanostructures in Presence of Hoffmeister Anions

Figure 3

XRD patterns of MnO₂ nanostructures showing (a) a dominant cryptomelane phase under SO₄⁻² treatment, (b) a mixed phase of cryptomelane and birnessite under Cl⁻ treatment, and (c) a dominant birnessite phase under ClO₄⁻ treatment.

(a)

(b)

(c)