Zn|Al salt (aq)|MnO2 galvanic cell with high voltage and high energy density

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<jats:title>Abstract</jats:title><jats:p>When an aqueous solution of AlCl<jats:sub>3</jats:sub> with a concentration of 3 M, which is almost a saturated solution, is used as the electrolyte, the title cell shows rather flat discharging voltage (averaged discharging voltage of 1.78 V) with high discharging voltage until ∼85% of the one‐electron capacity (12.3 mA h or discharging of 6.2 h at 2 mA) of MnO<jats:sub>2</jats:sub> is discharged.</jats:p>

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