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Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor
Author(s) -
Mohamed Saad G.,
Attia Sayed Y.,
Barakat Yosry F.,
Hassan Hamdy H.,
Zoubi Wail Al
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801042
Subject(s) - supercapacitor , hydrothermal circulation , sulfur , hydrothermal synthesis , materials science , doping , nitrogen , nanotechnology , chemical engineering , chemistry , electrochemistry , metallurgy , electrode , optoelectronics , organic chemistry , engineering
The α‐MnS nanoflakes/rGO sheets were obtained via a facile one‐step hydrothermal approach using carbon disulfide as sulfur source, and ethylenediamine as a complexing agent which forms a complex with Mn 2+ ions. Oil droplets of carbon disulfide and water are bridged via the hydrophobic/hydrophilic nature of ethylenediamine. α‐MnS/rGO was successfully co‐doped by nitrogen and sulfur by the action of ethylenediamine and CS 2 , respectively. The as‐prepared material exhibits an excellent electrochemical performance with a remarkable specific capacitance of 700 F g −1 at a current density of 1 A g −1 , high rate capability of 66.65% retention at 20 A g −1 and superior cycling stability of 127% capacitance retention after 10000 cycles. To further explore the electrochemical performance of α‐MnS/rGO, a hybrid supercapacitor device was assembled using the α‐MnS/rGO as a positive electrode and an activated carbon as a negative electrode. The fabricated device exhibits the highest energy density of 38.13 Wh kg −1 at a power density of 850 W kg −1 and still retains 21.25 Wh kg −1 at a power density of 17 kW kg −1 . These superior results demonstrate that the α‐MnS/rGO nanoflakes electrode can be considered as a promising material for high‐performance supercapacitors.