In situ generation of CoCeSx bimetallic sulfide nanoparticles on graphene composite modified by bi-pyrene terminated molecular for supercapacitors

Chemistry. 2021 Oct 14. doi: 10.1002/chem.202103145. Online ahead of print.ABSTRACTGraphene's excellent electrical conductivity benefits from its highly-conjugated structure. Therefore, the manipulation of graphene's electronic and mechanical properties can be realized by controlled destruction of its in-sheet conjugation system. Herein, we report the preparation of CoCeS x -SA@BPMW@RGO via π-π stacking interactions at molecular level. In detail, sodium alginate was compounded with Co 2+ and Ce 3+ , the composite was loaded onto graphene. The graphene sheets are propped by bi-pyrene terminated molecular wire (BPMW) to avoid the re-stacking of the grapheme sheets allow the creation of nanometer-sized space between them. The BPMW have 33.2° angle between coplanar pyrene group and benzene groups, graphene layers were propped in tilt direction. Finally, the three-dimensional porous composite was obtained after annealing and vulcanization. The resulting CoCeS x -SA@BPMW@RGO shows excellent electrical conductivity and remarkable cycle stability, and high specific capacitance of 1004 F g -1 when the current density is 1 A g -1 . The excellent electrochemical performance should benefit from the modification of graphene by BPMW via π-π stacking interactions and synergistic effect resulted from the special structure. Moreover, a solid-state asymmetric supercapacitor device is fabricated based on the synthesized CoCeS x -SA@BPMW@RGO hybrid, and exhibits a power density of 979 W kg ...
Source: Chemistry - Category: Chemistry Authors: Source Type: research