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

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(a) 2 × 2 tunnel structure of α-MnO₂ indicating the position of O and Mn. K doping has different effects on two Mn sites (blue and purple) bonded with apex site and plane site of octahedral O respectively; (b) PDOS of Mn bonded with apex site of O; (c) PDOS of Mn bonded with plane site of O.