Hydrogen Storage Materials: Room-Temperature Wet-Chemistry Approach toward Mixed-Metal Borohydrides

The poor kinetics of hydrogen evolution and the irreversibility of the hydrogen discharge hamper the use of transition metal borohydrides as hydrogen storage materials, and the drawbacks of current synthetic methods obstruct the exploration of these systems. A wet‐chemistry approach, which is based on solvent‐mediated metathesis reactions of precursors containing bulky organic cations and weakly coordinating anions, leads to mixed‐metal borohydrides that contain only a small amount of “dead mass”. The applicability of this method is exemplified by Li[Zn2(BH4)5] and M[Zn(BH4)3] salts (M=Na, K), and its extension to other systems is discussed. Keine „Tote Masse“: Wasserstoffreiche Mischmetall‐Borhydride sind vielversprechende Materialien für die chemische Speicherung von H2. Der nasschemische Ansatz zu ihrer Herstellung beruht auf einer Metathesereaktion, führt nicht zu einem hohen Anteil „toter Masse“ (Metallhalogenide oder koordinierte Lösungsmittel) und lieferte eine Reihe von MZn(BH4)‐Borhydriden (M=Li, Na, K).