Synthesis, Characterization, and Supercapacitor Performance of a Mixed-Phase Mn-Doped MoS2 Nanoflower

Abstract

The fascinating features of 2D nanomaterials for various applications have prompted increasing research into single and few-layer metal dichalcogenides nanosheets using improved nanofabrication and characterization techniques. MoS2 has recently been intensively examined among layered metal dichalcogenides and other diverse transition metal-based materials, that have previously been studied in various applications. In this research, we report mixed-phase Mn-doped MoS2 nanoflowers for supercapacitor performance studies. The confirmation of the successfully prepared Mn-doped MoS2 nanoflowers was characterized by XRD, SEM-EDS, RAMAN, and BET research techniques. The mixed-phase of the as-synthesized electrode material was confirmed by the structural changes observed in the XRD and RAMAN studies. The surface area from the BET measurement was calculated to be 46.0628 m2/g, and the adsorption average pore size of the electrode material was 11.26607 nm. The electrochemical performance of the Mn-doped MoS2 electrode material showed a pseudo-capacitive behavior, with a specific capacitance of 70.37 Fg−1, and with a corresponding energy density of 3.14 Whkg−1 and a power density of 4346.35 Wkg−1. The performance of this metal-doped MoS2-based supercapacitor device can be attributed to its mixed phase, which requires further optimization in future works.

Tailoring Electrochemical Performance of Co3O4 Electrode Materials by Mn Doping

“…From the Ragone plot in Figure 4 g, the 0.3Mn-Co 3 O 4 /AC//ASC achieves a maximum energy density of 43.5 W h/kg, at a power density of 1350 W/kg. The corresponding energy and power densities of these supercapacitors are shown in Table 2 [ 21 , 35 , 36 , 37 , 38 ]. To explore the cycling stability of the device, 10,000 charge and discharge tests were carried out.…”

Non‐modulated synthesis of cobalt‐doped MoS 2 for improved supercapacitor performance

“…Among the transition metal sulfides, MoS 2 is a promising electrode material for supercapacitor applications, because of its fascinating sheet-like structure, which provides a huge surface area for double-layered charge storage and a greater intrinsic fast ionic conductivity. [15][16][17] MoS 2 is made up of covalently S-Mo-S atoms held together by weak van der Waals interactions and has a theoretically larger capacity than graphite. It comes in a variety of polytype formations, including 2H and 1 T phases, as well as oxidation states ranging from +2 to +6.…”

“…Because of their natural abundance, easily controllable morphologies, multiple valences, and acceptable bandgap widths, various transition metal sulfides, including that of copper sulfide, nickel sulfide, zinc sulfide, molybdenum sulfide (MoS 2 ), manganese sulfide, strontium sulfide, and vanadium sulfide, have stirred interest for supercapacitor applications. Among the transition metal sulfides, MoS 2 is a promising electrode material for supercapacitor applications, because of its fascinating sheet‐like structure, which provides a huge surface area for double‐layered charge storage and a greater intrinsic fast ionic conductivity 15‐17 . MoS 2 is made up of covalently S‐Mo‐S atoms held together by weak van der Waals interactions and has a theoretically larger capacity than graphite.…”

Rational design of selenium inserted 1T/2H mixed-phase molybdenum disulfide for energy storage and pollutant degradation applications

“…Similarly, Vikraman et al engineered the active sites of MoS 2 by transition metal doping using a conventional chemical precipitation technique and they concluded that metal-doped MoS 2 is a process with a high specific capacitance of 353 F g −1 with a high capacitance retention rate of 94% [9]. Bello et al reported the charge storage performance of the Mn-doped MoS 2 nanoflowers, they noticed that metal doping can effectively enhance the energy storage performance of the 2D MoS 2 [17]. Likewise, Raj et al investigated the effect of energy storage performance of VSe 2 before and after the cobalt insertion and they found capacitance enhancement after the addition of Co due to the synergy interplay between the heteroatom and the TMTD.…”