Hybrid MnO₂–disordered mesoporous carbon nanocomposites: synthesis and characterization as electrochemical pseudocapacitor electrodes

Carbon Materials for Chemical Capacitive Energy Storage

“…This feature implied in lower electrolyte resistance and better diffusion in the materials with larger mesopores. Furthermore, similar oxide contents deposited on MWNT afforded thicker MnO 2 films (6 nm)119 than on the surface of mesoporous carbons, resulting in better conductivity in the latter case at 100 mV s −1 scan rates 121. While for MnO 2 ‐MWNT the gravimetric capacitance dropped from 350 F g −1 MnO2 at 2 mV s −1 down to 37 F g −1 MnO2 at 100 mV s −1 , the capacitance approached 137 F g −1 MnO2 at 100 mV s −1 for the MnO 2 coated mesoporous carbon.…”

“…For soft‐templated mesoporous carbons containing MnO 2 , the capacitances differed for materials prepared by post‐synthesis grafting of MnO 2 121 to those made in one‐pot synthesis method 120. For instance, materials modified with a 1 nm thick film of MnO 2 prepared by a post‐synthesis method,121 retained its capacitance at much higher scan rates than the mesoporous carbons containing MnO 2 nanocrystals in the mesopore walls (one‐pot synthesis) 120. The former materials exhibited twice as large mesopores (∼8 nm), compared to the latter composites.…”

Materials and fabrication of electrode scaffolds for deposition of MnO2 and their true performance in supercapacitors

“…This in-situ redox deposition process is simple and scalable for preparation of MnO 2 /carbon composites, thus immediately attracts research attentions [76,233e243]. However, the earlier studies are mostly focused on synthesis of powder composite materials via the reduction of MnO À 4 ions in aqueous dispersions of carbon nanomaterials, such as acetylene black [235,236,240], templated mesoporous carbon [233,234,241,243], CNTs [237e240,242], and graphene [76].…”

“Brick‐and‐Mortar” Self‐Assembly Approach to Graphitic Mesoporous Carbon Nanocomposites

“…Recently, soft‐templated OMCs containing ceramic,17 metallic18 and oxide nanoparticles19 were reported. In the latter case, the chemical composition of the nanoparticles allows their incorporation (20–30 wt%) to the frameworks of the final materials in significant amounts 19…”