Zheyang MO, Weiyi YANG, Shuang GAO, Jian Ku SHANG, Yajun DING, Wuzhu SUN, Qi LI. Efficient oxygen reduction reaction by a highly porous, nitrogen-doped carbon sphere electrocatalyst through space confinement effect in nanopores [J]. Journal of Advanced Ceramics, 2021, 10 (4): 714-728. 10.1007/s40145-021-0466-1.