Hybrid and Asymmetric Supercapacitors: Achieving Balanced Stored Charge across Electrode Materials.

An electrochemical capacitor configuration extends its operational potential window by leveraging diverse charge storage mechanisms on the positive and negative electrodes. Beyond harnessing capacitive, pseudocapacitive, or Faradaic energy storage mechanisms and enhancing electrochemical performance at high rates, achieving a balance of stored charge across electrodes poses a significant challenge over a wide range of charge-discharge currents or sweep rates. Consequently, fabricating hybrid and asymmetric supercapacitors demands precise electrochemical evaluations of electrode materials and the development of a reliable methodology.

Selective activation of MoS grain boundaries for enhanced electrochemical activity.

Molybdenum disulfide (MoS) has emerged as a promising material for catalysis and sustainable energy conversion. However, the inertness of its basal plane to electrochemical reactions poses challenges to the utilization of wafer-scale MoS in electrocatalysis. To overcome this limitation, we present a technique that enhances the catalytic activity of continuous MoS by preferentially activating its buried grain boundaries (GBs).

Enhanced Thermoelectric Performance in Ternary Skutterudite Co(GeTe) via Band Engineering.

We report the phase evolution and thermoelectric properties of a series of Co(GeTe)Sb ( = 0-0.20) compositions synthesized by mechanical alloying. Pristine ternary Co(GeTe) skutterudite crystallizes in the rhombohedral symmetry (3̅), and Sb doping induces a structural transition to the cubic phase (ideal skutterudite, 3̅).

Ti-rich TiO Tubular Nanolettuces by Electrochemical Anodization for All-Solid-State High-Rate Supercapacitor Devices.

Supercapacitors store charge by ion adsorption or fast redox reactions on the surface of porous materials. One of the bottlenecks in this field is the development of biocompatible and high-rate supercapacitor devices by scalable fabrication processes. Herein, a Ti-rich anatase TiO material that addresses the above-mentioned challenges is reported.

Hierarchical Co3O4/Co(OH)2 Nanoflakes as a Supercapacitor Electrode: Experimental and Semi-Empirical Model.

In this research, facile and low cost synthesis methods, electrodeposition at constant current density and anodization at various applied voltages, were used to produce hierarchical cobalt oxide/hydroxide nanoflakes on top of porous anodized cobalt layer. The maximum electrochemical capacitance of 601 mF cm(-2) at scan rate of 2 mV s(-1) was achieved for 30 V optimized anodization applied voltage with high stability. Morphology and surface chemical composition were determined by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis.