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The resulting primary zinc–air battery showed peak power density of ~265 mW/cm 3, current density of ~200 mA/cm 3 at 1 V and energy density >700 Wh/kg. [ 19 ] [ 20 ] Rechargeable Zn–air batteries in a tri-electrode configuration exhibited an unprecedented small charge–discharge voltage polarization of ~0.70 V at 20 mA/cm 3 , high ...
2 surrounding those planets is produced solely by the action of ultraviolet radiation on oxygen-containing molecules such as carbon dioxide. Cold water holds more dissolved O 2. The unusually high concentration of oxygen gas on Earth is the result of the oxygen cycle.