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. 2015 Nov 16;5:16618. doi: 10.1038/srep16618

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Variation of specific capacitance and coulombic efficiency with increasing current density in 1 M Li₂SO₄, and (b) Ragone plot for the AS-800 sample in 1 M H₂SO₄ (Voltage range: 1.1 V) and 1 M Li₂SO₄ (Voltage range: 1.7 V).