Formic acid as a potential on-board hydrogen storage method-development of  homogeneous noble-metalcatalysts for the dehydrogenation reactions

Hydrogen can be used as an energy carrier for the renewable energy to overcome its deficiency of an intrinsically intermittent supply. One of the most promising application of hydrogen energy is on-board hydrogen fuel cells. However, the lack of a safe, efficient, convenient and low-cost storage and transportation method for hydrogen limits their application. The feasibility of mainstream hydrogen storage techniques in vehicles application is briefly discussed in this review. Formic acid (FA), which can reversibly be converted into hydrogen and carbon dioxide via catalysis, presents a suitable potentiality for practical applications. Historic developments and recent examples of homogeneous noble metal catalysts for FA dehydrogenation are covered, and the catalysts are classified based on their ligand types. The review primarily focuses on the structure-function relationship between ligands and their reactivity, hoping to provide suggestions for design new and efficient catalysts for H 2 generation from FA.