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

Abstract

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.

Palladium on Nitrogen‐Doped Mesoporous Carbon: A Bifunctional Catalyst for Formate‐Based, Carbon‐Neutral Hydrogen Storage

“…The dehydrogenation of formate was also tested on the same as‐prepared catalysts. Notably, at reaction temperatures above 323 K the product, KHCO 3 , tends to decompose into CO 2 and K 2 CO 3 (Supporting Information, Figure S4); hence, the turn‐over frequencies (TOFs) of all the catalysts were calculated strictly according to the pure H 2 produced after the absorption of CO 2 with excess concentrated NaOH solution, to allow comparison to other reported results . As shown in Figure , Pd/NMC‐8 can catalyze the reaction efficiently at 333 K, with a TOF of 1118 h −1 in the first 10 min.…”

Nitrogen‐Decorated Porous Carbon Supported AgPd Nanoparticles for Boosting Hydrogen Generation from Formic Acid

“…1), besides with high activity. [22] Cao's group designed an efficient and durable formate-based hydrogen battery based on repetitive cycles operated between aqueous formate dehydrogenation and bicarbonate hydrogenation, using Pd/r-GO nanocatalyst. The poor reusability and recoverability of homogeneous catalysts restrict their widely applications in practice.…”

CO2‐Mediated H2 Storage‐Release with Nanostructured Catalysts: Recent Progresses, Challenges, and Perspectives

“…[81] The material's relatively high catalytic activity for both reactions was attributed to the lattice distortions present in its supported Pd nanoparticles. [82] Although the activities of these materials are lower than that of Pd NPs/r-GO mentioned earlier, the former are easier to synthesize than the latter because their carbon support materials can be made with simpler synthetic procedures and from easily available staring materials. [57] The catalytic activities of the material was improved by adjusting the structures and compositions of the support materials as well as the size of the Pd nanoparticles and the electronic properties around nanoparticles through the heteroatom dopants on the support material.…”