Figure 5
From: Restoration of thermally reduced graphene oxide by atomic-level selenium doping
Electrochemical performances of rGO and Se-rGO as the anode and catalyst for Li-ion and Li-air batteries, respectively. (a) Galvanostatic discharge/charge profiles of Se-rGO and rGO at a current density of 1 C (372 mA g–1), (b) rate performances of Se-rGO and rGO at consecutively increasing current densities from 1 C (372 mA g–1) to 50 C (18 600 mA g–1), with subsequent reversal to 1 C (372 mA g–1), and (c) cycling performance of Se-rGO as a Li-ion battery anode for 1000 repetitive cycles at a current density of 3 C (1116 mA g–1). (d) Discharge/charge profiles of rGO- and Se-rGO-based air electrodes in a potential range of 2.0–4.5 V at a constant current rate of 200 mA g–1 for Li–O2 cells (inset image of a modified Li–O2 Swagelok-type cell). (e) Comparison of electrochemical properties for rGO- and Se-rGO-based Li–O2 cell air electrodes with and without the LiI catalyst. The capacity was utilized up to 500 mAh g–1. The dotted line indicates the theoretical formation voltage of Li2O2 at 2.96 V vs Li/Li+.
