NiMn2O4 Nanosheet‐Decorated Hierarchically Porous Polyaromatic Carbon Spheres for High‐Performance Supercapacitors

• Published in: ChemElectroChem Vol. 4; no. 5; pp. 1214 - 1221
• Main Authors: Kim, Mi Ri, NaiduKalla, Reddi Mohan, Kim, Seok, Kim, Mi‐Ra, Kim, Il
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01.05.2017
• Subjects: Anthracene; Capacitance; Carbon; carbon spheres; Current density; Decoration; Electrodes; Electron transport; hybrid; Nanosheets; nickel manganese oxide; polyaromatics; porous materials; Supercapacitors; Synthesis
• ISSN: 2196-0216; 2196-0216
• DOI: 10.1002/celc.201700023

We have designed and synthesized hierarchically porous and spherical carbons decorated with a nickel manganese oxide (NiMn2O4) and utilized them as a pseudocapacitor electrode. The polyanthracene (PAT)‐based carbon materials were firstly synthesized by the self‐polymerization of bromomethylated anthracene in the presence of zinc bromide as a catalyst and bromomethyl methyl ether as a crosslinker. The carbon materials with a 3D network were fabricated by direct carbonization and activation of the as‐prepared PAT. The micro‐, meso‐, and macroporous 3D carbon materials are characterized by a large specific surface area, an electrolyte−electrode interface area, and a continuous electron transport path. To produce high‐performance pseudocapacitor electrodes, NiMn2O4‐decorated carbon hybrid materials (C@NiMn2O4) have also been synthesized by using a hydrothermal method. The C@NiMn2O4 composites exhibit a maximum specific capacitance of 470.7 F g−1 at a current density of 1 A g−1, good rate capability of 74.6 %, and excellent capacitance retention of 89.6 % at a current density of 10 A g−1 following 5000 cycles. Based on these results, the electrode shows good potential for future supercapacitor applications. Interior design: The hierarchically porous and spherical carbons decorated with a nickel manganese oxide (NiMn2O4), fabricated by the self‐polymerization of bromomethylated anthracene followed by the hydrothermal decoration, show good potential for supercapacitor applications as a pseudocapacitor electrode.