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. 2017 Feb 23;8:14559. doi: 10.1038/ncomms14559

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Copyright © 2017, The Author(s)

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Electrochemical testing results: (a) CV curves for the samples at 50 mV s⁻¹ scan rate; (b), (c) and (d) galvanostatic charge–discharge curves of the pH=2, 4 and H_xMnO₂ samples; (e) comparison of specific capacitance for the samples as a function of current density; and (f) cycle stability at constant current density of 5 A g⁻¹ between 0 and 1 V.