Research progress and future aspects: Metal selenides as effective electrodes

Transition metal diselenides (TMDSs) are one of the promising materials in electrochemical energy storage systems because of their super hydrophilicity, honeycomb array, and multistructural resilience make TMDSs and their composites ideal for a variety of applications. TMDSs and their composites have high supercapacitor storage capacities and hold a unique position in supercapacitor research. However, the low electrical conductivity, poor cycle stability, and low rate performance, on the other hand, severely restrict their uses for large-scale applications. This review offers a thorough introduction to TMDSs and their composites, as well as an overview of current research developments. The most popular TMDS preparation processes have been presented, and their link to structural electrochemical performance will be examined in depth. Another topic covered in the viewpoint is TMDS-based composites, which help to improve the overall performance of supercapacitors, particularly in terms of energy density and cycle stability. The most pressing scientific issues and prospects for producing efficient and stable TMDS-based electrodes for high-energy supercapacitor applications are discussed.

Recent trends in transition metal diselenides (XSe2: X = Ni, Mn, Co) and their composites for high energy faradic supercapacitors

Facile Synthesis of Bimetal Nickel Cobalt Phosphate Nanostructures for High-Performance Hybrid Supercapacitors

Multifunctional hierarchical graphene-carbon fiber hybrid aerogels for strain sensing and energy storage

High performance flexible supercapacitor based on metal-organic-framework derived CoSe2 nanosheets on carbon nanotube film

High-performance energy storage and sensing devices have been undergoing rapid development to meet the demand for portable and wearable electronic products, which require flexibility, extensibility, small volume and lightweight. In this study, we construct a lightweight and flexible self-powered sensing system by integrating a highly stretchable strain sensor with a high-performance asymmetric supercapacitor based on ZnSe/CoSe2//ECNT (ECNT: electrochemically activated carbon nanotube film). The ZnSe/CoSe2 two-dimentional nanosheets on carbon nanotube (CNT) films are synthesized through a simple and efficient strategy derived from ZnCo-based metal-organic frameworks (MOFs). The density functional theory (DFT) simulations show the higher conductivity of the ZnSe/CoSe2/CNT electrode than the CoSe2/CNT electrode. Due to the synergistic properties of self-supported two-dimentional ZnSe/CoSe2 nanosheets with high specific surface area and the high pathway of one-dimention CNTs, the nanocomposite electrode provides efficient transmission and short paths for electron/ion diffusion. The asymmetric supercapacitor provides a stable output power supply to the sensors that can precisely respond to strain and pressure changes. The sensor can also be attached to a garment for measuring a variety of joint movements.

Xuan Ran

Papers

High performance flexible supercapacitor based on metal-organic-framework derived CoSe2 nanosheets on carbon nanotube film

High-performance flexible self-powered strain sensor based on carbon nanotube/ZnSe/CoSe2 nanocomposite film electrodes