Understanding oxygen reactions in aprotic Li-O2batteries
Ma Shunchao1, 2, †, 
, Zhang Yelong1, 2, †, , Cui Qinghua1, 2, Zhao Jing1, 2, Peng Zhangquan1, ‡,
, Zhang Yelong1, 2, †, , Cui Qinghua1, 2, Zhao Jing1, 2, Peng Zhangquan1, ‡, (a) Current vs. capacity of CNT electrodes discharged potentiostatically over a range of potentials between 2.0 V and 2.76 V. (b) PITT discharge of CNT electrodes from an open circuit (∼ 3.15 V) with a voltage step of 5 mV and a current cutoff per step of 1 mA/gC. Inset: zoom-in of the PITT response in the capacity range below 1 mA·h/gC, where the current corresponds to only capacitive discharge. (c) Voltage vs. capacity of CNT electrodes discharged galvanostatically between 10 mA/gCand 1000 mA/gC. (d) Tafel plot of voltage vs. carbon true surface area-normalized current for electrodes discharged potentiostatically (blue circles) from (a) and galvanostatically (gray circles) from (c).[
