Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

Abstract

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 Mn2+ 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 CS2, 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.

A Novel Trace-Level Ammonia Gas Sensing Based on Flexible PAni-CoFe2O4 Nanocomposite Film at Room Temperature

“…The XPS spectrum confirms the presence of Co, Fe, N, O and C in the nanocomposite, Figure 11 a. The core level of C1s ( Figure 11 b) deconvoluted into four distinct peaks at 283.8 eV, 284.7 eV and 287.3 eV, which belongs to —C=C, C—N, and C=O bands, respectively [ 51 , 52 ]. The peak at 285.7 eV is related to C—O [ 53 ].…”

Facile synthesis of ZnMoO4/AlPO4-5 nanorod composites as visible-light-driven photocatalysts and high-performance energy storage materials

“…This result may be ascribed to when Mo, Zn mole ration increased more than 2 will block some of the redox-active sites which restricted the interaction with the ionic electrolyte leading to the loss of its capacitance. 51,[53][54][55] As shown in (Fig. 13b), the CV curves of Mo : Zn (2)/AlPO 4 -5 were performed at different scan rates from 10 mV s À1 to 200 mV s À1 to evaluate its electrochemical performance as electroactive material for SC.…”

A High Capacity Aluminum‐Ion Battery Based on Imidazole Hydrochloride Electrolyte

“…[8,9] Dai and co-workers presented a rechargeable Al-ion battery using costly [EMIm]Cl as electrolyte, which achieved a specific capacity of 60 mA h g À 1 . [10] Since then, more researchers have devoted themselves to the field of Al-ion batteries, positive electrode material, [11][12][13][14][15][16] current collector [17][18][19] and electrolyte. [20][21] The battery with urea as electrolyte yielded a specific capacity of 73 mA h g À 1 after 150 cycles.…”