Boosting capacitive performance of manganese oxide nanorods by decorating with three-dimensional crushed graphene

Akter Hossain Reaz; Shimul Saha; Chanchal Kumar Roy; Md Abdul Wahab; Geoffrey Will; Mohammed A Amin; Yusuke Yamauchi; Shude Liu; Yusuf Valentino Kaneti; Md Shahriar Hossain; Shakhawat H Firoz

doi:10.1186/s40580-022-00300-2

Boosting capacitive performance of manganese oxide nanorods by decorating with three-dimensional crushed graphene

Nano Converg. 2022 Feb 21;9(1):10. doi: 10.1186/s40580-022-00300-2.

Authors

Affiliations

¹ Department of Chemistry, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh.
² Department of Chemistry, Jashore University of Science and Technology, Jashore, 7408, Bangladesh.
³ Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD, 4072, Australia.
⁴ School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD, 4000, Australia.
⁵ Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
⁶ JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan.
⁷ JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan. lsdyy@yonsei.ac.kr.
⁸ Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD, 4072, Australia. v.kaneti@uq.edu.au.
⁹ School of Mechanical and Mining Engineering, Faculty of Engineering, Architecture, and Information Technology (EAIT), The University of Queensland, Brisbane, QLD, 4072, Australia.
¹⁰ Department of Chemistry, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh. shfiroz@chem.buet.ac.bd.

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.

Keywords: Energy storage; Manganese oxide; Reduced graphene oxide; Supercapacitors; Three-dimensional architecture.

Abstract

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