Highly Efficient Hydrogen Storage System Based on Ammonium Bicarbonate/Formate Redox Equilibrium over Palladium Nanocatalysts

A highly efficient, reversible hydrogen storage–evolution process has been developed based on the ammonium bicarbonate/formate redox equilibrium over the same carbon‐supported palladium nanocatalyst. This heterogeneously catalyzed hydrogen storage system is comparable to the counterpart homogeneous systems and has shown fast reaction kinetics of both the hydrogenation of ammonium bicarbonate and the dehydrogenation of ammonium formate under mild operating conditions. By adjusting temperature and pressure, the extent of hydrogen storage and evolution can be well controlled in the same catalytic system. Moreover, the hydrogen storage system based on aqueous‐phase ammonium formate is advantageous owing to its high volumetric energy density. Revolution of H2 evolution? A highly efficient hydrogen storage–evolution process has been developed based on the ammonium bicarbonate/formate redox equilibrium over a carbon‐supported palladium nanocatalyst. Ammonium ion improves the efficiencies of both the hydrogenation of bicarbonate and the dehydrogenation of formate. By adjusting the reaction temperature and pressure, the extent of chemical reaction of hydrogen storage and evolution can be well controlled within the same catalytic system.