State Key Laboratory of Inorganic Synthesis and Preparative Chemistry University 130012’s Republic of China;
State Key Laboratory of Bio-Fibers and Eco-Textiles of Materials Science and Engineering University 266071’s Republic of China;
Qingdao Institute of Bioenergy and Bioprocess Technology Academy of Sciences Song Ling Rd 266101’s Republic of China;
Laboratoire Catalyse et Spectrochimie Univ Marechal Juin Caen;
Covalent organic framework; Quasi-three-dimensional structures; Oxygen reduction reaction; Metal-free electrocatalyst;