Facile Synthesis of Mesoporous Carbon Spheres Using 3D Cubic Fe-KIT-6 by CVD Technique for the Application of Active Electrode Materials in Supercapacitors

Abstract

Mesoporous carbon spheres (MCS-750, MCS-800, MCS-850, MCS-900, and MCS-950) have been synthesized by a facile strategy with low temperature and rapid chemical vapor deposition technique. The synthesized MCS possess relatively large surface area (570–670 m 2 g –1 ), good graphitization, remarkable porosity, and redox functionalities on the surface of the synthesized MCS. Combination of these structural and surface properties of the synthesized MCS as an electrode material (MCS-850) showed an excellent charge-storage capacity with a specific capacitance of 338 F/g at 1 mV/s, 217 F/g at 0.5 A/g. MCS-850 shows long-term cycling stability with capacitive retention of more than 96% after 2000 cycles in 6 M KOH electrolyte. In addition, a fabricated two-electrode symmetric cell obtained 86% retention after 2000 cycles. The two-electrode symmetric device exhibited a specific capacitance of 63 F/g at 5 mV/s with an energy density of 7.1 Wh/kg.

Simple CVD growth of P-doped graphitic hallow carbon spheres for high-voltage (2.0 V) aqueous symmetric supercapacitor

“…1d-f, the remarkable appearance of carbon sphere was observable in between the dark edge and the pale center of P-GHCS indicates that hollow structure with shell thickness of about 90-120 nm. Such a hollow structure formation is possibly due to vapor liquid (VL) mechanism [41] during carbon sphere growth. Furthermore, as can be seen from Fig.…”

“…The mesoporous 3D cubic Fe-KIT-6 was synthesized alike to the previous report [41]. Briefly, P123 (4 g) was added to the solution mixture contains 7.9 g of 35% w/w HCl solution and 144 mL of distilled water.…”

“…In our previous work [41], carbon spheres with mesoporous hollow structure was successfully grown over Fe-KIT-6 catalytic support using C 2 H 2 as a carbon source by CVD technique and employed as an active electrode material for supercapacitor application. Enlightened by our previous results, it is further interesting in doping of heteroatom (phosphorus) into the mesoporous carbon sphere to enhance electrochemical performance.…”

Monomer Self‐Deposition for Ordered Mesoporous Carbon for High‐Performance Supercapacitors

“…[6] Compared with the soft-template method, the hard-template method is one of the most practical and effective approaches to control the porous structurea nd morphologyo fO MCs and thus has obtainedw ide attention.H owever,i nt he hard-template method, multiple steps are alwaysr equired. [6] Compared with the soft-template method, the hard-template method is one of the most practical and effective approaches to control the porous structurea nd morphologyo fO MCs and thus has obtainedw ide attention.H owever,i nt he hard-template method, multiple steps are alwaysr equired.…”

“…So far,t he template method is the main approachtos ynthesize OMCs, including soft and hard templates. [6] Compared with the soft-template method, the hard-template method is one of the most practical and effective approaches to control the porous structurea nd morphologyo fO MCs and thus has obtainedw ide attention.H owever,i nt he hard-template method, multiple steps are alwaysr equired. [3,7] Typically,s olvents such as ethanol, acetone, N,N-dimethylformamide, tetrahydrofuran, or water are necessary for assemblyo ft he carbon precursors in the hard-template channels by infiltration or im-pregnation.…”