Two-Dimensional NHVO Nanoflakes as Efficient Energy Conversion and Storage Materials for the Hydrogen Evolution Reaction and Supercapacitors.

Herein, for the first time, we present two-dimensional (2D) NHVO nanoflakes as an excellent material for both energy conversion of the hydrogen evolution reaction and storage of supercapacitors by a simple and fast two-step synthesis, which exhibit a completely sheet-like morphology, high crystallinity, good specific surface area, and also stability, as determined by thermogravimetric analysis. The 2D-NHVO flakes show an acceptable hydrogen evolution performance in 0.5 M HSO on a glassy carbon electrode (GCE) coated with 2D-NHVO, which results in a low overpotential of 314 mV at -10 mA cm with an excellent Tafel slope as low as 90 mV dec.

Computation and Investigation of Two-Dimensional WO·HO Nanoflowers for Electrochemical Studies of Energy Conversion and Storage Applications.

The aim of this study is to prepare a two-dimensional (2D) WO·HO nanostructure assembly into a flower shape with good chemical stability for electrochemical studies of catalyst and energy storage applications. The 2D-WO·HO nanoflowers structure is created by a fast and simple process at room condition. This cost-effective and scalable technique to obtain 2D-WO·HO nanoflowers illustrates two attractive applications of electrochemical capacitor with an excellent energy density value of 25.

Hybrid Functional Study on Small Polaron Formation and Ion Diffusion in the Cathode Material NaMn(SO).

The crystal structure, electronic structure, and diffusion mechanism of Na ions in the cathode material NaMn(SO) are investigated based on the Heyd-Scuseria-Ernzerhof hybrid density functional method. The simultaneous motion model of polaron-sodium vacancy complexes was used to reveal the diffusion mechanism of Na ions in this material. Polaron formation at the Mn third-nearest neighbor to the Na vacancy was found.