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. 2015 Mar 13;5:9094. doi: 10.1038/srep09094

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(a) XAFS spectra of K-MnO₂ at different doping concentrations and Li/Na doped MnO₂; (b) Fourier transform of the XAFS data in (a); (c)XAFS in the near edge of different forms of manganese oxides; (d) Fourier transformation of 2 at% K-doped MnO₂ and MnO₂ at different phases.