Journal
CHEMSUSCHEM
Volume 8, Issue 8, Pages 1442-1451Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201403458
Keywords
carbon-neutral cycle; energy storage; hydrogenation; PNP ligand; ruthenium
Funding
- Loker Hydrocarbon Research Institute
- United States Department of Energy
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Due to the intermittent nature of most renewable energy sources, such as solar and wind, energy storage is increasingly required. Since electricity is difficult to store, hydrogen obtained by electrochemical water splitting has been proposed as an energy carrier. However, the handling and transportation of hydrogen in large quantities is in itself a challenge. We therefore present here a method for hydrogen storage based on a CO2(HCO3-)/H-2 and formate equilibrium. This amine-free and efficient reversible system (>90% yield in both directions) is catalyzed by well-defined and commercially available Ru pincer complexes. The formate dehydrogenation was triggered by simple pressure swing without requiring external pH control or the change of either the solvent or the catalyst. Up to six hydrogenation-dehydrogenation cycles were performed and the catalyst performance remained steady with high selectivity (CO free H-2/CO2 mixture was produced).
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