Few-layered MoSe₂ nanosheets are synthesized via a facile hydrothermal method. A symmetric two-electrode device consisting of MoSe₂ nanosheets showed enhanced performance and good capacitance retention over 10 000 cycles.

Electrochemical energy storage devices (EESs) play a crucial role for the construction of sustainable energy storage system from the point of generation to the end user due to the intermittent nature of renewable sources. Additionally, to meet the demand for next-generation electronic applications, optimizing the energy and power densities of EESs with long cycle life is the crucial factor. Great efforts have been devoted towards the search for new materials, to augment the overall performance of the EESs. Although there are a lot of ongoing researches in this field, the performance does not meet up to the level of commercialization. A further understanding of the charge storage mechanism and development of new electrode materials are highly required. The present review explains the overview of recent progress in supercapattery devices with reference to their various aspects. The different charge storage mechanisms and the multiple factors involved in the performance of the supercapattery are described in detail. Moreover, recent advancements in this supercapattery research and its electrochemical performances are reviewed. Finally, the challenges and possible future developments in this field are summarized.

Graphene-decorated V₂O₅ nanobelts (GVNBs) were synthesized via a low-temperature hydrothermal method in a single step. V₂O₅ nanobelts (VNBs) were formed in the presence of graphene oxide, a mild oxidant, which also enhanced the conductivity of GVNBs. From the electron energy loss spectroscopy analysis, the reduced graphene oxide (rGO) are inserted into the layered crystal structure of V₂O₅ nanobelts, which further confirmed the enhanced conductivity of the nanobelts. The electrochemical energy-storage capacity of GVNBs was investigated for supercapacitor applications. The specific capacitance of GVNBs was evaluated using cyclic voltammetry (CV) and charge/discharge (CD) studies. The GVNBs having V₂O₅-rich composite, namely, V₃G₁ (VO/GO = 3:1), showed superior specific capacitance in comparison to the other composites (V₁G₁ and V₁G₃) and the pure materials. Moreover, the V₃G₁ composite showed excellent cyclic stability and the capacitance retention of about 82% was observed even after 5000 cycles.

Dye-sensitized solar cells (DSSCs) have been extensively evolved for the past two decades in order to improve their cell performance. From the commercialization point of view, the overall solar to electrical energy conversion efficiency should compete with other solar cells. But, due to structural restrictions of DSSC using the liquid electrolyte and a space requirement between two electrodes, the direct tandem construction of DSSCs by stacking of repeating units is highly limited. In this feature article, important research trials to overcome these barriers and a recent research trend to improve the light harvesting strategies mainly panchromatic engineering, various tandem approaches such as parallel tandem, series tandem, p–n tandem etc., have been briefly reviewed.

The hybrid MoSe ₂ /rGO nanosheets were synthesized via a facile hydrothermal process. The hybrid nanosheets electrode showed enhanced specific capacitance value than that of the pristine MoSe ₂ . The MoSe ₂ /rGO nanosheets exhibited increasing capacitance retention of up to 180% for the long-term stability test of 10,000 cycles at high current density.