Modified chemical synthesis of MnS nanoclusters on nickel foam for high performance all-solid-state asymmetric supercapacitors

Abstract

Novel MnS nanoclusters were synthesized on nickel foam (NF) using a successive ionic layer adsorption and reaction (SILAR) method. MnS nanoclusters with different sizes were obtained by varying the number of deposition cycles. The crystal structure, chemical composition, and surface microstructure of the electrodes were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and high resolution transmission electron microscopy. The electrochemical behavior of the MnS nanoclusters was examined by cyclic voltammetry, galvanostatic charge-discharge, cycling test, and electrochemical impedance spectroscopy. The MnS nanoclusters prepared with 90 SILAR cycles showed the best supercapacitance in a 6 M KOH aqueous electrolyte with a specific capacitance of 828 F g À1 at a scan rate of 5 mV s À1 and cycling stability of 85.2% after 5000 charge-discharge cycles.Moreover, an asymmetric supercapacitor (ASC) was assembled with the as-prepared MnS electrode on NF as the positive electrode, hydrothermally prepared reduced graphene oxide (rGO) on NF as the negative electrode, and PVA-KOH gel as the electrolyte. The MnS@NF//rGO@NF ASC showed excellent electrochemical performance with maximum energy and power densities of 34.1 W h kg À1 and 12.8 kW kg À1, respectively. The ASC also showed a capacitive retention of 86.5% after 2000 charge-discharge cycles, highlighting its practical application for energy storage.

Fabrication of a 3D Hierarchical Sandwich Co9S8/α‐MnS@N–C@MoS2 Nanowire Architectures as Advanced Electrode Material for High Performance Hybrid Supercapacitors

“…The high‐resolution deconvoluted Mn 2p spectrum shows two peaks at ≈641.8 and 653. 6 eV corresponding to Mn 2p 3/2 and Mn 2p 1/2 of α‐MnS, respectively (Figure b) . The high‐resolution Mo 3d spectrum is deconvoluted into seven peaks and the peak at 226.4 eV corresponding to S 2s of MoS 2 (Figure c) .…”

Resistive switching characteristics of carbon nitride supported manganese oxysulfide: an evidence for the sweep dependent transformation of polarity

“…The Mn 2p 3/2 and Mn 2p 1/2 peaks were observed at 640.25 and 652.36 eV, respectively. The presence of S 2p 3/2 peak at 162.2 eV attributed the sulfide anion 22 , whereas another high energy peak at 166.3 eV can be assigned for the presence of oxysulfide ion (oxidized sulfur) [22][23][24] . The O1s XPS spectra of the manganese oxysulfide sample is shown in Fig.…”

The role of carbon nanotubes in enhanced charge storage performance of VSe2: experimental and theoretical insight from DFT simulations

“…At lower current density the electrode might undergo some parasitic reactions, which may be originated from the diffusion and responsible for the low coulombic efficiency of VSe 2 /80 mg MWCNT at lower current density. [42][43][44] The VSe 2 /80 mg MWCNT possesses high cyclic stability with 87% of capacitive retention aer 5000 GCD cycles and a 95% of coulombic efficiency which provides high reversibility and higher power operation (Fig. 2f).…”