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Ternary metal sulfides (TMSs) have garnered significant attention as alternative electrode materials for rechargeable metal‐ion battery anodes and electrodes for electrochemical supercapacitors (SCs). With the escalating costs of lithium, research has shifted toward alternative sources like sodium‐ion batteries (NIBs) and potassium‐ion batteries (KIBs), offering cost‐effectiveness and greater natural abundance globally. However, pursuing suitable electrode materials beyond lithium‐ion batteries (LIBs), such as NIBs, KIBs, and SCs with enhanced energy and power density, remains a formidable challenge. In this context, TMSs demonstrate remarkable reversibility as NIB, KIB, and SC electrode materials, showcasing multi‐electron redox reactions, improved electronic conductivity, and higher theoretical capacities. Numerous research articles have highlighted the promising future of TMSs as electrodes for electrochemical energy conversion and storage (EECS). Nonetheless, practical applications are hindered by limitations, including structural stability during long‐standing cyclability, electronic conductivity, and scalability. This review systematically demonstrates how varying synthesis routes can tailor nanostructures and their influence on electrochemical activity. Additionally, an in‐depth literature survey is provided on the electrochemical performances of TMSs in NIBs, KIBs, and SCs and summarize recent advancements with the best available literature. Moreover, promising prospects and challenges are highlighted, expressing optimism that TMSs will emerge as pivotal electrodes for EECS. [ABSTRACT FROM AUTHOR]

Transition metal dichalcogenides (TMDs) are fascinating and prodigious considerations in the electrochemical energy storage sector because of their two dimensional chemistry as well as heterogeneous characteristics. Herein, we synthesized interconnected WS2 nanosheets by a hydrothermal method followed by sulphuration at 850 °C in an argon atmosphere. The ultrathin WS2 nanosheet array is endowed with an excellent specific capacitance of 74 F g−1 at the current density of 3 A g−1 up 7000 cycles. Moreover, a symmetric supercapacitor was fabricated using WS2 nanosheets, which provided the admirable high specific capacity of 6.3 F g−1 at 0.05 A g−1 with the energy and power density of 5.6 × 102 mW h kg−1 and 3.6 × 10 5 mW kg−1, respectively. Density functional theory (DFT) simulations revealed the presence of populated energy states near the Fermi level resulting in a high quantum capacitance value, which supports the experimentally achieved high capacitance value. The attained results recommend interconnected WS2 nanosheets as a novel, robust, and low-cost electrode material for supercapacitor energy storage devices. [ABSTRACT FROM AUTHOR]

Composite of dextrose-derived oxygen-rich carbon spheres and graphene oxide, synthesised using a cost-effective and easy hydrothermal process, was used as an active material in two of the trending and promising energy storage devices. The surface morphology and properties of the composite were studied using scanning electron microscope, X-ray diffractometer, energy dispersive X-ray analysis, elemental mapping and Raman spectra. To analyse the electrochemical behaviour of the material, several electrochemical techniques such as cyclic voltammetry (CV), chronopotentiometry, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation study were used. The reversibility of Fe2+/Fe3+ redox species and resistance offered by electrolyte towards the modified electrode were studied using CV, EIS and Tafel studies. Further evaluation of efficacy of the active material towards the iron redox flow battery (IRFB) of 132 cm2 area was analysed by performing charge discharge studies at varied current densities. Substantial increase in the electrochemical performance of the IRFB with a coulombic efficiency (CE) 93% along with the good life cycle stability up to 25 cycles was observed. The composite was also used as a superior electrode material for supercapacitor application resulting in significant enhancement in the electrochemical performance with specific capacitance of 610 F g−1 and CE of 83% with 93% retention up to 1600 cycles. [ABSTRACT FROM AUTHOR]

The multiple oxidation states of redox‐active materials enable them to store high‐energy better than the commonly used carbon‐based electrode materials. Accounting for these advantages, designing asymmetric supercapacitors by coupling redox‐active materials as positive electrodes with carbon‐based negative electrodes becomes a very attractive strategy. Herein, reduced graphene oxide‐wrapped hexagonal WO3 nanorod (rGO‐WO3 NR) by simple hydrothermal synthesis method is synthesized. Because of improved reaction kinetics resulting from the close contact between rGO and WO3 NRs, rGO‐WO3 NR demonstrates superior electrochemical properties than pure WO3. Motivated by the very high areal capacitance (2.5 F cm−3 at the applied current of 30 mA cm−2), an asymmetric SC device by combining rGO‐WO3 NR with activated carbon is assembled. The as‐assembled rGO‐WO3 NR//activated carbon asymmetric supercapacitor device demonstrates outstanding electrochemical performance in an operating voltage window of 1.2 V, admirable cycling stability of ≈95% (even after 14 000 cycles), with an energy density of 24.1 Wh Kg−1 at a power density of 1532.6 W Kg−1. These demonstrate the combination of redox‐active materials with high energy density can importantly boost the energy storage capacity of a supercapacitor. [ABSTRACT FROM AUTHOR]

The unique lithium‐ion battery anodes consisting of interconnected nano‐architectures with high specific surface areas, adequate buffer space to tolerate the volume change, excellent conductivities, and admirable mechanical stabilities demand for next‐generation lithium‐ion battery (LIB). Herein this report, highly interconnected and self‐assembled tungsten disulfide nanosheets (WS2 NS) array is constructed through simple hydrothermal process. The ultrathin nature of nanosheet array can not only efficiently buffer the huge volumetric change but also abbreviate the Li‐ion and electron diffusion path. As expected, the ultrathin WS2 nanosheets array is endowed with excellent structural stability and also very fast electrochemical kinetics, and hence extraordinary lithium‐storage performance, such as delivering high capacities of 813.33 mAh g−1 at a C rate of C/8, admirable rate capability and good cycling stability, that is, 242 and 226 mAh g−1 at a C rate of 1 and 2 C, respectively, up to 600 cycles. [ABSTRACT FROM AUTHOR]

As an attractive family of anode material for lithium‐ion battery (LIB), transition metal dichalcogenides (TMDs) with high energy density has been emerging very fast. Among various TMDs, tungsten disulphide (WS2) with its intrinsically layered structure is a promising alternative anode candidate because of its high theoretical capacity. However, WS2 usually suffers from poor cycling stability due to its large volume change during lithiation and delithiation process. Herein, we have synthesized carbon free nanostructured plate like WS2 (NP‐WS2) by an easy one pot hydrothermal synthesis process. Without introducing any conducting carbonaceous materials, the P‐WS2 showing extraordinary lithium storage properties. At a C‐rate of C/8, the observed initial lithiation and delithiation capacities are 682.0 and 555.7 mAh g−1, respectively. During the cycling stability test at a rate of C/4, even after 200 cycles P‐ WS2 delivered high delithiation capacity of 380 mAh g−1. Even without incorporation of conducting carbonaceous materials, NP‐WS2 demonstrated extraordinary lithium storage performance which indicates its potential as an alternative high capacity anode material for lithium‐ion battery. [ABSTRACT FROM AUTHOR]

Because of the inadequate sodium storage capacity of graphite, the exploration of high-performance SIB anodes is a crucial step forward. Herein, we report the hydrothermally synthesized self-assembled interconnected nanosheets of WO 3 microspheres possessing admirable sodium storage in terms of cycling stability and acceptable rate capability. Benefitting from the interconnected nature of the nanosheets with a hollow interior, the WO 3 microspheres exhibited a high sodiation capacity of 431 mA h g -1 at 100 mA g -1 and an excellent rate performance of 60 mA h g -1 at 500 mA g -1 with an impressive coulombic efficiency of around 99%. Importantly, even after continuous cycling with increasing current densities, a specific capacity as high as 220 mA h g -1 could be recovered at a current density of 50 mA g -1 , suggesting excellent sodium storage reversibility., Competing Interests: The authors declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (This journal is © The Royal Society of Chemistry.)

Transition metal dichalcogenides (TMDs) are fascinating and prodigious considerations in the electrochemical energy storage sector because of their two dimensional chemistry as well as heterogeneous characteristics. Herein, we synthesized interconnected WS 2 nanosheets by a hydrothermal method followed by sulphuration at 850 °C in an argon atmosphere. The ultrathin WS 2 nanosheet array is endowed with an excellent specific capacitance of 74 F g -1 at the current density of 3 A g -1 up 7000 cycles. Moreover, a symmetric supercapacitor was fabricated using WS 2 nanosheets, which provided the admirable high specific capacity of 6.3 F g -1 at 0.05 A g -1 with the energy and power density of 5.6 × 10 2 mW h kg -1 and 3.6 × 10 5 mW kg -1 , respectively. Density functional theory (DFT) simulations revealed the presence of populated energy states near the Fermi level resulting in a high quantum capacitance value, which supports the experimentally achieved high capacitance value. The attained results recommend interconnected WS 2 nanosheets as a novel, robust, and low-cost electrode material for supercapacitor energy storage devices.