Abstract
This work reports the rational design of MnOx nanorods on 3D crushed reduced graphene oxide (MnOx/C-rGO) by chemical reduction of Ni-incorporated graphene oxide (GO) followed by chemical etching to remove Ni. The resulting MnOx/C-rGO composite synergistically integrates the electronic properties and geometry structure of MnOx and 3D C-rGO. As a result, MnOx/C-rGO shows a significantly higher specific capacitance (Csp) of 863 F g−1 than MnOx/2D graphene sheets (MnOx/S-rGO) (373 F g−1) and MnOx (200 F g−1) at a current density of 0.2 A g−1. Furthermore, when assembled into symmetric supercapacitors, the MnOx/C-rGO-based device delivers a higher Csp (288 F g−1) than MnOx/S-rGO-based device (75 F g−1) at a current density of 0.3 A g−1. The superior capacitive performance of the MnOx/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 MnOx/C-rGO. In addition, the MnOx/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
Highlights
1 Introduction Supercapacitors are promising energy storage devices owing to their fast charge/discharge rate, excellent cyclic stability, high power density, and good environmental compatibility [1,2,3,4,5,6]
The S-rGO sample exhibits a flakelike architecture with isolated layers arranged intermittently edge-to-edge (Fig. 1a)
The nanoscale interlocking of graphene sheets is responsible for this structure [42, 43]
Summary
1 Introduction Supercapacitors are promising energy storage devices owing to their fast charge/discharge rate, excellent cyclic stability, high power density, and good environmental compatibility [1,2,3,4,5,6]. 3D graphene/MnO2 composite has been successfully synthesized by combining chemical vapor deposition (CVD) and hydrothermal methods This composite had a Csp of 333 F g −1 at 0.2 A g −1 [33]. Biomassderived N-doped 3D graphene@MnO2 (N-G@MnO2) composite was previously prepared by CVD method and it displayed a high Csp of 411.5 F g −1 at 0.5 A g−1 [34]. Both composites were fabricated using the CVD process which typically requires special apparatus and produces highly toxic gaseous as by-products [35]. The capacitive performance of the MnOx/C-rGO composite is superior compared to M nOx/S-rGO
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
