Ab initio study on hydrogen interaction with calcium decorated silicon carbide nanotube

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

International Journal of Hydrogen Energy

Volume

42

Issue

16

First Page

11452

Last Page

11460

Publication Date

4-20-2017

Abstract

© 2017 Hydrogen Energy Publications LLC Ab initio study on the viability of calcium decorated silicon carbide nanotube as a hydrogen storage material was conducted. Calcium strongly adsorbs on silicon carbide nanotube (SiCNT) with a significant binding energy of −2.83 eV, thus calcium's low cohesive energy and strong binding with SiCNT may prevent Ca to form clusters with other adsorbates. Bader charge analysis also revealed a charge transfer of 1.45e from Ca to SiCNT resulting to calcium's cationic state, which may induce charge polarization to a nearby molecule such as hydrogen. Hydrogen molecule was then allowed to interact with the calcium adatom where it exhibited charge polarization, induced by the electric field from calcium's positive charge. This resulted to a significant binding energy of −0.22 eV for the first hydrogen molecule. Results reveal that Ca on SiCNT can hold up to 7 hydrogen molecules and can be a promising candidate for a hydrogen storage material.

html

Digitial Object Identifier (DOI)

10.1016/j.ijhydene.2017.03.057

Upload File

wf_yes

This document is currently not available here.

Share

COinS