Ultralong nitrogen/sulfur Co‐doped carbon nano‐hollow‐sphere chains with encapsulated cobalt nanoparticles for highly efficient oxygen electrocatalysis oleh Wei Zhang, Xingmei Guo, Cong Li, Jiang‐Yan Xue, Wan‐Ying Xu, Zheng Niu, Hongwei Gu, Carl Redshaw, Jian‐Ping Lang