Abstract
Hydrogen storage is one of the critical barriers to the hydrogen-based clean energy supply chain. TiFe alloy is a prime candidate material for stationary hydrogen storage, which can play a critical role in the deployment of variable renewable energies. However, the understanding of the hydrogen storage properties of TiFe alloy and the development of industrially deployable storage technologies based on TiFe are still in their nascent stage. The properties of TiFe alloy rely strongly on the presence of oxygen due to the strong affinity of Ti to oxygen. This work systematically investigated the effects of oxygen on the equilibrium pressure of TiFe-H intermetallic hydride. We aim to understand how the oxygen content affects the (de)hydrogenation behavior of TiFe alloys. Specifically, we found that the oxygen can dissolve in the TiFe phase and form solid solutions of TiFe-O. During the thermochemical synthesis process of TiFe, with the increase of annealing time, the Ti4Fe2O phase decreases, and the oxygen in TiFe increases. The increase of oxygen content in the TiFe results in the increase of equilibrium pressure of the TiFe alloy. It suggests that the oxygen dissolved in TiFe can destabilize the TiFe-H hydride and alter the thermodynamics of the TiFe-H system.
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