CO₂-based hydrogen storage: CO₂ hydrogenation to formic acid, formaldehyde and methanol

The storage of hydrogen via hydrogenation of CO 2 to small organic molecules can be attractive for mobile applications. In this article, the state of the art regarding hydrogen storage in Methanol, Formic Acid as well as Formaldehyde and derivates based on CO 2 hydrogenation is summarized. The reverse reaction, the release of hydrogen from these molecules is also crucial and described in the articles together with possible concepts for the use of hydrogen storage by CO 2 hydrogenation.