Publication
Boosting capacitive performance of manganese oxide nanorods by decorating with three-dimensional crushed graphene
Publisher:
Springer Science and Business Media LLC
Date:
21-02-2022
DOI:
10.1186/S40580-022-00300-2
Abstract: This work reports the rational design of MnO x nanorods on 3D crushed reduced graphene oxide (MnO x /C-rGO) by chemical reduction of Ni-incorporated graphene oxide (GO) followed by chemical etching to remove Ni. The resulting MnO x /C-rGO composite synergistically integrates the electronic properties and geometry structure of MnO x and 3D C-rGO. As a result, MnO x /C-rGO shows a significantly higher specific capacitance ( C sp ) of 863 F g −1 than MnO x /2D graphene sheets (MnO x /S-rGO) (373 F g −1 ) and MnO x (200 F g −1 ) at a current density of 0.2 A g −1 . Furthermore, when assembled into symmetric supercapacitors, the MnO x /C-rGO-based device delivers a higher C sp (288 F g −1 ) than MnO x /S-rGO-based device (75 F g −1 ) at a current density of 0.3 A g −1 . The superior capacitive performance of the MnO x /C-rGO-based symmetric device is attributed to the enlarged accessible surface, reduced lamellar stacking of graphene, and improved ionic transport provided by the 3D architecture of MnO x /C-rGO. In addition, the MnO x /C-rGO-based device exhibits an energy density of 23 Wh kg −1 at a power density of 113 Wkg −1 , and long-term cycling stability, demonstrating its promising potential for practical application. Graphical Abstract