Ordered Mesoporous Carbons Loading on Sulfonated Graphene by Multi‐Components Co‐Assembly for Supercapacitor Applications

Abstract

Ordered mesoporous carbons (OMC) loading on sulfonated graphene (OMC/SG) have been fabricated by multi-components co-assembly followed by thermal polymerization and carbonization. OMC/SG composites possess the hierarchically ordered hexagonal mesostructure with the lattice unit parameter and porous diameter about 10 nm and 4 nm, respectively. Sulfonated graphene is integrated into the interpenetrated network structures via covalent bonding and hydrogen bonding, as well as is highly dispersed in OMC matrix. OMC/ SG composite shows a specific surface area high up to 1708.78 m 2 g À 1 , and a mesoporous ratio as high as 80 %. Meanwhile, the obtained OMC/SG exhibits a specific capacitance as high as 314.2 F g À 1 at 1.0 A g À 1 , while OMC based electrode is only 196.6 F g À 1 . In addition, the resultant OMC/ SG composites display good rate capability (70 % of the capacitance retained at current density high up to 100 A g À 1 ), and an excellent cycling stability (no capacitance loss over 5000 cycles). In particular, the surface capacitance of OMC/ SG (C s ) increases up to 18.4 μF cm À 2 at 1 A g À 1 . These optimized interconnected porous structures in the OMC/SG composites are favorable to the accessibility, rapid diffusion of aqueous electrolytes, while sulfonated graphene can also facilitate the transport of electrons and provide better interface wettability of electrodes with electrolytes, thereby leading to an excellent energy storage performance.[a] S. . XPS survey spectra of OMC/SG-0.04 and OMC (a), S 2p XPS spectra of OMC/SG-0.04 (b), C 1s XPS spectra of OMC/SG-0.04 (c) and OMC (e), O 1s XPS spectra of OMC/SG-0.04 (d) and OMC (f).

MnO2/Carbon Composites for Supercapacitor: Synthesis and Electrochemical Performance

“…Graphene is a two-dimensional carbon nanomaterial composed of hexagonal carbon atoms in a honeycomb lattice (Huang et al, 2011;Bayle et al, 2015). With its excellent physical and chemical properties, it has shown broad application prospects in the field of energy storage and conversion (Chen P. et al, 2018;Lu et al, 2018). Interest in the study of graphene has not been attenuated after Novoselov and Geim prepared a single layer of graphene by mechanical stripping at room temperature, breaking the prediction that quasi-two-dimensional crystal materials could not exist alone at room temperature (Novoselov et al, 2004).…”

Electrochemical Deposition Enables Freestanding CoNi Layered Double Hydroxide/MnOX Electrode with Enhanced Electrochemical Properties for Asymmetric Supercapacitors

“…The energy density ( E ) is decided by the total capacitance ( C ) and the voltage window ( V ) based on the equation E = 1/2 CV 2 . Compared with carbon‐based active materials used in a double electric layer capacitor (EDLC), pseudocapacitive materials, including metal oxides or hydroxides, have a high specific capacitance for redox reactions . Different from symmetrical capacitors, the asymmetric supercapacitor (ASC) fabricated using a pseudocapacitive positive material and an EDLC negative material can achieve a wider potential window …”