Water‐Soluble Iridium‐NHC‐Phosphine Complexes as Catalysts for Chemical Hydrogen Batteries Based on Formate

Abstract

Molecular hydrogen, obtained by water electrolysis or photocatalytic water splitting, can be used to store energy obtained from intermittent sources such as wind and solar power. The storage and safe transportation of H2 , however, is an open and central question in such a hydrogen economy. Easy-to-synthesize, water-soluble iridium-N-heterocyclic carbene-phosphine (Ir(I) -NHC-phosphine) catalysts show unprecedented high catalytic activity in dehydrogenation of aqueous sodium formate. Fast reversible generation and storage of hydrogen can be achieved with these catalysts by a simple decrease or increase in the hydrogen pressure, respectively.

Hidrogén tárolása homogén katalitikus kémiai rendszerekben

“…Azt találtuk, hogy az [Ir(cod)(emim)(mtppms)], 9 (4. ábra; cod = 1,5-ciklooktadién, emim = 1-etil-3-metilimidazol-2-ilidén) kiemelkedõen nagy sebességgel katalizálja mind a HCO 3 Na hidrogénezését, mind a HCO 2 Na (+H 2 O) dehidrogénezését (9. ábra) 34 . Amint a 9. ábrán látható, S/C = 10 000 arány mellett, 80°C hõmérsékleten 20 perc alatt közel 600 mL H 2 fejlõdött azaz a rendszer jelentõs gázáramok létrehozására is alkalmas.…”

“…Even more satisfyingly, the mixed-ligand [Ir(cod)(emim)(mtppms)], 9 (Fig. 4), containing both a tertiary phosphine and an N-heterocyclic carbene (NHC) ligand showed approximately 20 times higher catalytic activity, than 8 34 . These chemical systems represent viable hydrogen batteries, since -in addition to the catalyst and H 2 -they contain only an aqueous solution of inorganic salts and the catalysts are stable for long times under H 2 pressure.…”

Real Sociedad Española de Química Prizes 2015

“…In ChemSusChem hat er die Verwendung wasserlçslicher Iridium-NHC-Phosphan-Komplexe beschrieben. [11]…”

“…He is currently Leader of the Research Group on Homogeneous Catalysis and Chair of the Chemistry Section, Hungarian Academy of Sciences.J oó and his research group are interested in the use of organometallic catalysts in aqueous systems.H eh as reported in ChemSus-Chem on the use of water-soluble iridium-NHCphosphine complexes. [11] Joóisonthe International Advisory Board of ChemCatChem.…”

Preise 2015 der Real Sociedad Española de Química

“…Sein Forschungsthema ist der Einsatz von Organometallkatalysatoren in wässrigen Systemen. In ChemSusChem hat er die Verwendung wasserlöslicher Iridium‐NHC‐Phosphan‐Komplexe beschrieben 11. Joó ist Mitglied des International Advisory Board von ChemCatChem .…”