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One-step hdrothermal synthesis of nitrogen-doped reduced graphene oxide/hausmannite manganese oxide for symmetric and asymmetric pseudocapacitors.

Makgopa, Katlego
; 
Ratsoma, Mpho S.
; 
Raju, Kumar
; 
Mabena, Letlhogonolo F.
; 
Modibane, Kwena D.
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Abstract
In this paper, the pseudocapacitive performance of nitrogen-doped and undoped reduced graphene oxide/tetragonal hausmannite nanohybrids (N-rGO/Mn3O4 and rGO/Mn3O4) synthesized using a one-pot hydrothermal method is reported. The nanohybrid electrode materials displayed exceptional electrochemical performance relative to their respective individual precursors (i.e., reduced graphene oxide (rGO), nitrogen-doped reduced graphene oxide (N-rGO), and tetragonal hausmannite (Mn3O4)) for symmetric pseudocapacitors. Among the two nanohybrids, N-rGO/Mn3O4 displayed greater performance with a high specific capacitance of 345 F g−1 at a current density of 0.1 A g−1, excellent specific energy of 12.0 Wh kg−1 (0.1 A g−1), and a high power density of 22.5 kW kg−1 (10.0 A g−1), while rGO/Mn3O4 demonstrated a high specific capacitance of 264 F g−1 (0.1 A g−1) with specific energy and power densities of 9.2 Wh kg−1 (0.1 A g−1) and 23.6 kW kg−1 (10.0 A g−1), respectively. Furthermore, the NrGO/ Mn3O4 nanohybrid exhibited an impressive pseudocapacitive performance when fabricated in an asymmetric configuration, having a stable potential window of 2.0 V in 1.0 M Na2SO4 electrolyte. The nanohybrid showed excellent specific energy and power densities of 34.6 Wh kg−1 (0.1 A g−1) and 14.01 kW kg−1 (10.0 A g−1), respectively. These promising results provide a good substance for developing novel carbon-based metal oxide electrode materials in pseudocapacitor applications.
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Date
2021-11-15
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Publisher
American Chemical Society
Collections
Department of Chemistry - Research Articles
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makgopa 5 (ISE 500).pdf
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Keywords
Hydrothermal, Manganese, Pseudocapacitors, Symmetric, Asymmetric
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URI
https://hdl.handle.net/20.500.14519/1085
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