[BMMIM]Cl/EDB was investigated. This system is able to deliver about 6.5 wt% of hydrogen at 140 C competing with conventional hydrogen storage pressure tanks. The correlation between polarity of the ILs and hydrogen yield was investigated and the suitability for hydrogen storage systems is evaluated and discussed.

Here we report the synthesis and application of finely divided Cu 2 O nanoparticles (Cu 2 O-NPs) in the range from 5.5 nm to 8.0 nm in phosphonium ionic liquids as the first recyclable and effective catalytic system for smooth, ligand-and additive-free protodecarboxylation of 2-nitrobenzoic acid as a model substrate and further derivatives. The reactions run with low catalyst loadings and result in quantitative yield in ten consecutive recycling experiments. In addition this system is highly selective towards electron-poor 2-nitrobenzoic acids.

Ionic liquid (IL) based H 2 storage for H 2 generation from NH 3 BH 3 derivatives is shown. These systems promote H 2 generation at low temperature, with good reaction rates and high total H 2 yields. The effects of ILs and the H 2 yield in correlation with the basicity, the cations of the ILs, and the role of carbenes are discussed. Furthermore, mechanistic findings on the dehydrogenation are described. IL material blends are competitive with conventional H 2 storage materials with experimental efficiencies of at least 6.5 wt % H 2 .

Abstract:The application of ionic liquids revealed a new dimension in many fields of chemistry. In the particular field of hydrogen storage system ionic liquids find application in several different ways. After a short introduction about the matter of hydrogen storage and its advantages and challenges, the different approaches of ionic liquid application in this field are presented. The different approaches can be classified into the application of ionic liquids as (i) solvent, as (ii) co-catalyst, as (iii) catalyst, as (iv) hydrogen storage material and as (v) stabilizing agent for nano particles. The benefit of ionic liquids for the system is discussed in this review.

Getting light: Guanidinium borohydride (GBH) and ethylene‐diamine bisborane (EDB) represent interesting molecular materials for hydrogen storage. Certain systems are theoretically able to deliver up to 5 equiv of dihydrogen (12.4 wt %) under mild conditions. The yielded hydrogen gas is of high purity and produces defined BN species which are important for an efficient regeneration‐process.