Modification of BCC phase and the enhanced reversible hydrogen storage properties of Ti-V-Fe-Mn alloys with varied V/Fe ratios

Abstract

With the increasingly serious environmental problems caused by fossil fuels, hydrogen energy, which has advantages such as high calorific value, renewability, and zero carbon emissions, has been given high expectations [1][2][3][4] . Hydrogen energy not only provides power for hydrogen fuel cell vehicles (HFCVs) [5] , but also plays a crucial role in industrial fields such as chemicals, electronics, and power [6] . At present, the main obstacle to the widespread application of hydrogen energy is its storage and transportation [7] . The current mainstream hydrogen storage methods are high-pressure gaseous hydrogen storage, lowtemperature liquid hydrogen storage, and metal hydride solid-state hydrogen storage [8][9][10] . Metal hydride solid-state hydrogen storage has received widespread attention due to its high safety and high hydrogen storage density [11][12][13] . In the past few decades, a series of solid-state hydrogen storage materials have been developed [10][11][12][13][14][15][16] , but these materials cannot simultaneously meet the requirements of easy activation, fast absorption and release rates, high hydrogen storage capacity, and working close to room temperature and atmospheric pressure. Ti-V