First-principle screening of structural, electronic and hydrogen storage properties of Vanadium based hydride perovskites XVH$_3$ (X = Li, K)

TL;DR

This study uses first-principles calculations to investigate the structural, electronic, and hydrogen storage properties of Vanadium-based hydride perovskites XVH$_3$ (X = Li, K), assessing their stability and potential for green energy applications.

Contribution

It provides a comprehensive theoretical analysis of Vanadium-based hydride perovskites, highlighting their stability, metallic nature, and hydrogen storage capacity for energy applications.

Findings

Hydrides are stable cubic structures with space group 221 Pm-3m.

The compositions are metallic in nature based on band structure analysis.

They show strong thermoelectric responses suitable for green energy.

Abstract

V-based XVH$_3$ (X = Li,K) hydrides perovskites are investigated for their hydrogen storage capacity using the WIEN2K code. To verify the stability of these hydrides, first-principles investigations are employed to examine their structural, electronic and hydrogen storage properties. According to structural studies these compositions hydrides are stable and part of the cubic space group (221 Pm-3m). We have examined many aspects of these compositions throughout, using the PBE-GGA exchange correlation potential. We obtained the energy versus volume curve and found the stable phase and structural parameter of these hydrides using equation of state given by Birch-Murnaghan's. These hydrides thermodynamic stability is expressed in terms of their gravimetric hydrogen storage capacity.The goal of this study is to compute the standard enthalpy of formation and thermal desorption to ascertain the stability of these hydrides. Based on band structure and density of state plots it is found that these compositions are metallic in nature. The study presents a preliminary theoretical approach for hydrogen storage applications of thermoelectric compositions, revealing their strong thermoelectric responses and potential for green energy sources.