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. 2014 Jul 14;4:5684. doi: 10.1038/srep05684

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(a) The voltage curve. (b) Cumulative amounts of O₂ and CO₂ evolved in the charge process at the current density of 4.5 mA g⁻¹. The slope of 0.25 O₂/e⁻ indicates theoretical rate of O₂ evolution according to the reaction, 2O²⁻ → 4e⁻ + O₂. (c) The XRD 111 peak intensity of Co-doped Li₂O. The peak intensity at 0 mAh g⁻¹ was taken as a unity. The black line is a theoretical line of change in the peak intensity.