Extended Data Fig. 1: Characterization of CNT air cathode and cycling performance of the Ca-O2 battery.
From: A rechargeable calcium–oxygen battery that operates at room temperature
a, b, SEM (a) and TEM (b) images of CNT cathode. Scale bars, 1 μm (a), 5 nm (b). c, Nitrogen adsorption-desorption isotherm of the CNT, indicating a specific surface area of 172.5 m2/g. d, Galvanostatic discharge and charge curves of Ca-O2 battery at a current density of 1 A/g and a specific capacity of 500 mAh/g for 700 cycles.
