Solar-driven H2 production from formic acid

Hydrogen energy is considered an ideal substitute for fossil energy. However, hydrogen storage is still a bottleneck to the widespread adoption of a hydrogen economy. The development of suitable hydrogen storage materials would provide a promising solution. Formic acid (FA) is a promising candidate as a hydrogen storage material due to its merits of high hydrogen volumetric content, low cost, ready availability, high safety, and reversibility. Solar energy is inexhaustible and photocatalytic FA dehydrogenation provides an appealing strategy for H₂ production, storage, and application. In this review, we mainly focus on the recent advances in photocatalytic FA dehydrogenation systems, especially the progress and current existing challenges, aiming to help stimulate potential advanced developments for this exciting field.