Fig. 4From: A Free-Standing Sulfur/Nitrogen-Doped Carbon Nanotube Electrode for High-Performance Lithium/Sulfur Batteries a, b TEM images of N-CNT and S/N-CNT composite. Inset EDS mapping showing distribution of S in the S/N-CNT composite. c, d SEM images of S/N-CNT composite before and after discharge/charge cyclesBack to article page