Unveiling the role of dopants in boosting CuS supercapacitor performance: insights from first-principles calculations.

Transition metal sulfides have become famous in high energy density supercapacitor materials owing to their rich redox and high conductivity. While their development has achieved a breakthrough in terms of capacitance, there is little knowledge from the theoretical perspective on how dopants play a role in enhancing their capacitances. In this work, pseudocapacitance and quantum capacitance were evaluated through first-principles calculation to describe their role in transition metal sulfide, which here is represented by copper sulfide (CuS).

High Volumetric Energy Density Supercapacitor of Additive-Free Quantum Dot Hierarchical Nanopore Structure.

The high surface-area-to-volume ratio of colloidal quantum dots (QDs) positions them as promising materials for high-performance supercapacitor electrodes. However, the challenge lies in achieving a highly accessible surface area, while maintaining good electrical conductivity. An efficient supercapacitor demands a dense yet highly porous structure that facilitates efficient ion-surface interactions and supports fast charge mobility.

Novel strategy for high-performance supercapacitors through the polyvinylpyrrolidone (PVP)-assisted growth of FeS.

Iron disulfide or pyrite (FeS) has emerged as a promising transition metal sulfide-based supercapacitor owing to its abundance and superb electrochemical properties. However, FeS still faces major hurdles in realizing its full potential, such as a low energy density and poor conductivity. In this study, we report a high-performance FeS supercapacitor synthesized by a direct one-step process with the help of polyvinylpyrrolidone (PVP).

Interface Analysis of LiCl as a Protective Layer of LiAlTi(PO) for Electrochemically Stabilized All-Solid-State Li-Metal Batteries.

Regardless of the superiorities of LiAlTi(PO) (LATP), such as stability against oxygen and moisture, high ionic conductivity, and low activation energy, its practical application in all-solid-state lithium metal batteries is still impeded by the formation of ionic-resistance interphase layers. Upon contact with Li metal, electron migration from Li to LATP causes the reduction of Ti in LATP. As a result, an ionic-resistance layer will be formed at the interface between the two materials.