SnO2/Cu/CNT electrode is prepared with tin dioxide and copper coated on CNT.
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The SnO2-based negative offers a large capacity but difficult to access if <0.15 V.
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Influences of three mass ratios are studied with a fixed activated carbon loading.
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The optimal activated carbon:SnO2/Cu/CNT mass ratio is 1:0.67.
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Influences of potential at 0% state of charge in capacitor are discussed.
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