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It is vital to develop an effective energy storage system for storing energy sources, particularly renewable energy sources, which have grown substantially in the preceding decade. The development of effective electrode materials can aid in the resolution of such problem. Metal chalcogenides have shown promise in a various sector, consisting of energy conversion and storage. Herein, a novel hierarchical Ag 2 Se/SnTe nanocomposite is fabricated by in situ one step hydrothermal approach for supercapacitor applications. The various analytical techniques were employed for the structural, morphological, and textural properties of fabricated electrocatalyst material. The result of electrochemical studies suggests that the Ag 2 Se/SnTe exhibited the specific capacitance (C s) of 1560.32 F g−1, energy density (E d) of 99.76 Wh kg−1, power density (P d) 1356.8 W kg−1 @ 4 A g−1 and retention capacitance of 95% over 5000 cycle under 2.0 M KOH. This research not only demonstrates the enormous potential of the readily available Ag 2 Se/SnSe composite, but also a revolutionary approach for producing, high-performance and low-cost composite materials for many other energy applications. [ABSTRACT FROM AUTHOR]

• A bind-free MoTe 2 /rGO nanohybrid electrode was developed via a hydrothermal route. • A MoTe 2 nanoparticles are anchored on the rGO nanosheet investigated by scanning electron microscopy (SEM). • MoTe 2 /rGO nanohybrid display a remarkable specific capacitance of 1196.4 F g−1 as compared to pristine material. The rising prevalence of electronic devices necessitates the application of supercapacitors, which rely on electrochemically active materials with high capacitive performance. Two-dimensional (2D) molybdenum ditelluride (MoTe 2) nanoarrays have piqued great interest due to their wide-range applications including supercapacitor material, because of the inherent layered structure, low band gap and comparable conductivity. On the other hand, its self-aggregations decrease its chemical stability and activity, which remains a major barrier to its actual application. By combining with carbon-based reduced graphene oxide (rGO), self-aggregation and electrochemical activity can be improved significantly. In this research, MoTe 2 -supported rGO (MoTe 2 /rGO) was fabricated via a low-cost facile hydrothermal approach and characterised by fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDX) that is inclined with scanning electron microscope (SEM). Electrochemical assessments were also accomplished in an aqueous electrolytic solution of 2.0 M potassium hydroxide (KOH) for supercapacitor performance. The MoTe2/rGO shows exceptional specific capacitance (Cs) of 1196 F g−1, specific energy of 83.06 Wh kg−1- as well as 353.5 W kg−1 specific power at a current density of 1 A g−1 measured from galvanostatic charge/discharge (GCD) profile. On the other hand, the composite shows specific capacitance of 757.40 F g−1 measure via cyclic voltammetry (CV) at a scan rate of 5 mV s−1. Additionally, the nanohybrid shows a robust retention capacitance of 94.23% after 5000th successive cycles at 1 A g−1. The mechanical flexibility, intense cooperation and combined effects of MoTe 2 and rGO nanosheets are responsible for the exceptional performance of supercapacitor applications. Because of its enormous potential for green energy generation and its simplicity of manufacture in a single step, MoTe 2 /rGO nanocomposite can serve as an electrode for extraordinary supercapacitors. [Display omitted] [ABSTRACT FROM AUTHOR]

The rapid consumption and utilization of fossil fuels create a polluted environment and energy depletion. However, there is an urgent need to develop an alternative source for producing energy sources and energy storage devices. In this study, CoFePO 4 is designed by a simple reduction method to address energy production and energy shortage issues. The structure, phase purity, sample orientation, textual characteristics and morphology are evaluated through different techniques. The electrocatalytic activity of the fabricated electrode material was investigated and the deposited eggshell membrane act as a working electrode in a basic medium. The fabricated electrode material exhibited the 1685 F g−1 specific capacitance with 79.45 Wh kg−1 specific energy density with a current density of 0.02 A g−1. The oxygen evolution reaction (OER) performance displays a smaller overpotential equivalent to 285 mV with a smaller 53 mv dec−1 tafel slope value, and also the electrocatalyst shows good stability for 14 h. The experimental results revealed that the CoFePO 4 nanoflakes are a potential candidate for energy conversion systems and oxygen evolution reaction. [ABSTRACT FROM AUTHOR]