Preparation of N-doped nanoporous carbon from ZIF-8 metal-organic framework via ultrasonic spray pyrolysis

N-doped nanoporous carbon (NPC) was synthesized from ZIF-8 metal-organic framework via a one-step ultrasonic spray pyrolysis (USP) process and evaluated as a supercapacitor electrode material. The USP method involves ultrasonic nebulization of a ZIF-8 suspension, formation of agglomerates by preheating the droplets, and carbonizing the agglomerates at 1100 degrees C to yield USP-NPC. For comparison, conventional ZIF-8-derived NPC (c-NPC) and spray-dried ZIF-8 derived NPC (SD-NPC) were also prepared. USP-NPC consists of spherical dense submicron particles with a BET surface area of 1059 m2 /g and high N content (6.4 at%). Electrochemical tests revealed that USP-NPC exhibited superior supercapacitance performance (249.7F/g at 0.5 A/g) and 10000-cycles durability compared to c-NPC and SD-NPC. The enhanced performance of USP-NPC is attributed to its spherical morphology, high surface area, and rich N-doping. This study demonstrates that the USP method is a promising approach for the facile synthesis of high-performance NPC electrode materials for supercapacitor applications. (c) 2024 The Society of Powder Technology Japan. Published by Elsevier BV and The Society of Powder Technology Japan. All rights are reserved, including those for text and data mining, AI training, and similar technologies.