Microstructure and Hydrogen Storage Properties of Ti1V0.9Cr1.1 Alloy with Addition of x wt % Zr (x = 0, 2, 4, 8, and 12)

Salma Sleiman,Jacques Huot

doi:10.3390/inorganics5040086

Salma Sleiman, Jacques Huot

Open Access

https://doi.org/10.3390/inorganics5040086

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Journal: Inorganics	Publication Date: Dec 3, 2017
Citations: 11	License type: CC BY 4.0

Affiliation: Université du Québec à Trois-Rivières

Abstract

The effect of adding Zr on microstructure and hydrogen storage properties of BCC Ti1V0.9Cr1.1 synthesized by arc melting was studied. The microstructures of samples with Zr were multiphase with a main BCC phase and secondary Laves phases C15 and C14. The abundance of secondary phases increased with increasing amount of zirconium. We found that addition of Zr greatly enhanced the first hydrogenation kinetics. The addition of 4 wt % of Zr produced fast kinetics and high hydrogen storage capacity. Addition of higher amount of Zr had for effect of decreasing the hydrogen capacity. The reduction in hydrogen capacity might be due to the increased secondary phase abundance. The effect of air exposure was also studied. It was found that, for the sample with 12 wt % of Zr, exposure to the air resulted in appearance of an incubation time in the first hydrogenation and a slight reduction of hydrogen capacity.

Highlights

Hydrogen is considered a possible alternative energy carrier in the future
The first hydrogenation kinetics of Ti1 V0.9 Cr1.1 + x wt % Zr (x = 2, 4, 8, and 12) alloys was found to be increased with the amount of Zr
Doping with Zr generated a multiphase microstructure made of a main body-centred cubic (BCC) phase and secondary phases

Summary

Introduction

Hydrogen is considered a possible alternative energy carrier in the future. One of the most challenging barriers of using hydrogen is to establish a safe, reliable, compact, and cost-effective means of storing hydrogen [1,2,3,4]. Among the many different metal hydride systems, the Ti-based body-centred cubic (BCC) solid solution alloys are considered to be good candidates for hydrogen storage tanks because of their tunable pressure plateau and safety [7,8,9,10]. These include heat treatment [12], addition of Zr7 Ni10 [12,13,14,15,16], or Zr [17,18] and by element substitution [19,20] Another approach was made by Edalati K. et al [21] who used high-pressure torsion to induce microstructural modification and so enhancing hydrogen storage properties of Ti–V BCC alloys.

Microstructure Analysis

Backscattered

Structural Characterization

Activation Process

XRD Patterns after Hydrogenation

Materials and Methods

Conclusions