Phosphorene defect/edge sites induced ultrafine CoPx doping during one-pot synthesis of ZIF-67: The boosted effect on electrocatalytic oxygen reduction after carbonization

摘要: Abstract Design and synthesis of highly effective catalysts for electrochemical oxygen reduction reaction (ORR) with low cost is great significance due to the purpose energy conversion storage. Herein, we report a facile solvothermal method prepare ultrafine cobalt phosphide (CoPx)-doped Co-based zeolitic imidazole framework (CoPx/ZIF-67). The one-pot CoPx/ZIF-67 involves an oxygen-free sealed room-temperature reaction, in which high chemical activity rich defect sits 2D black phosphorus quantum dots (BPQDs) endows edge-selective coordination /reduction Co ions. Carbonization at 800 °C can produce CoPx-N-doped porous carbon composites (CoPx-NPC). as-prepared CoPx-NPC retains intrinsic morphology rhombic dodecahedrons, similar that NPC derived from ZIF-67. CoPx doping causes electronic modulation offers more active electrocatalytic sites etc., so possesses enhanced ORR performance terms positive onset-potential (∼−0.06 V vs. SCE), large diffusion limiting current density (−4.703 mA cm−2), stability, as well accelerated kinetics.