In Situ Synthesis of CoCeS_x Bimetallic Sulfide Nanoparticles on a Bi‐Pyrene Terminated Molecular Wire Modified Graphene Surface for Supercapacitors

Abstract

The excellent electrical conductivity of graphene is due to its highly-conjugated structures. Manipulation of the electronic and mechanical properties of graphene can be achieved by controlling the destruction of its in-sheet conjugation system. Herein, we report the preparation of CoCeS x À SA@BPMW@RGO through π-π stacking interactions at the molecular level. In this study, sodium alginate was reacted with Co 2 + and Ce 3 + , and the composite was loaded onto a graphene surface. The graphene sheets were prepared using a bi-pyrene terminated molecular wire (BPMW) to avoid re-stacking of the grapheme sheets, thereby forming nanoscale spaces between sheets. The angle between the BPMW coplanar pyrene group and the phenyl group was 33.2°, and the graphene layer is supported in an oblique direction. Finally, a three-dimensional porous composite was obtained after annealing and vulcanization. The obtained CoCeS x À SA@BPMW@RGO exhibited excellent electrical conductivity and remarkable cycle stability. When the current density was 1 A g À 1 , its specific capacitance was as high as 1004 F g À 1 . BPMW modifies graphene through the synergistic effect of π-π stacking interaction and special structure to obtain excellent electrochemical performance. Moreover, a solid-state asymmetric supercapacitor device was fabricated based on the synthesized CoCeS x À SA@BPMW@RGO hybrid, which exhibited a power density of 979 W kg À 1 at an energy density of 23.96 Wh kg À 1 .

Designing of the CoFeX (X= Se, P, S) Flower-like Structures on Nickel Foam as Efficient Positive Electrodes for a High-Performance Hybrid Supercapacitor

“…By utilizing their desirable SC and vast voltage range (1.6 V), an energy density as high as 61.40, 52.18, and 45.46 W h/kg for the CoFe 2 Se 4 @NiF//AC@NiF, CoFeP@NiF//AC@NiF, and CoFeS 2 @NiF//AC@NiF devices, respectively, can be attained. However, upon power density increments to 15,999.6, 16,001.48, and 15,991.3 W/kg at 20 A/g for CoFe 2 Se 4 @NiF//AC@NiF, CoFeP@NiF//AC@NiF, and CoFeS 2 @NiF//AC@NiF devices, respectively, these devices still present high energy densities of 44.33, 34.67, and 27.34 W h/kg, which greatly overtake those of other hybrid supercapacitors reported. ,,− …”

A universal concept for area‐selective assembly of metal oxide core‐shell nanoparticles, nanorods, and organic molecules via amide coupling reactions

“…As a complementary performance, the overhead layer as a functional NM can be additionally functionalized by fluorescent pyrene molecules in order to enhance the electric conductive properties of nanohybrid. [38][39][40][41][42] F I G U R E 1 Schematic representation of self-assembling PHA and AMPA SAM molecules on pristine NPs and NRs Herein, we display the new setup with simple and universal approach of organic-inorganic nanohybrid with 1aminopyrene molecules and favorable electrical-thermalmechanical properties, which may be relevant in thinfilm memory nanoelectronics. Additionally, we present a fabrication protocol of precise area-selective, controlled order and homogeneity of assembly of metal oxide coreshell NMs layer-by-layer thin-film formation in solution as ternary NPs-NRs-NPs.…”