Substitutional effects in TiFe for hydrogen storage: a comprehensive review

TL;DR

This comprehensive review discusses how chemical substitutions, especially manganese, in TiFe alloys influence their hydrogen storage properties, aiming to guide the design of cost-effective and efficient storage materials.

Contribution

It provides an in-depth analysis of substitution effects in TiFe-based compounds, highlighting their impact on thermodynamics and hydrogenation performance for storage applications.

Findings

Substitutions modify TiFe thermodynamics favorably.

Manganese substitution enhances hydrogenation properties.

Chemical modifications can tailor alloy performance for practical use.

Abstract

The search for suitable materials for solid-state stationary storage of green hydrogen is pushing the implementation of efficient renewable energy systems. This involves rational design and modification of cheap alloys for effective storage in mild conditions of temperature and pressure. Among many intermetallic compounds described in the literature, TiFe-based systems have recently regained vivid interest as materials for practical applications since they are low-cost and they can be tuned to match required pressure and operation conditions. This work aims to provide a comprehensive review of publications involving chemical substitution in TiFe-based compounds for guiding compound design and materials selection in current and future hydrogen storage applications. Mono- and multi-substituted compounds modify TiFe thermodynamics and are beneficial for many hydrogenation properties. They will be reviewed and deeply discussed, with a focus on manganese substitution.