Flash-quench technique has proven to be a novel photocatalytic method to convert bromide to bromine nearly quantitatively by using ruthenium trisbipyridine-tpye complexes. In this research proposal, we plan to explore this concept to increase the solar energy conversion and storage efficiency. The key part for solar energy conversion is to create electron separated until ready to use. This research is focus on the oxidation processes. Photooxidation reaction is designed to use flash-quench reaction scheme. Ruthenium complexes with high oxidation potentials such as [Ru(bpy)2(deeb)]2+, Ru(deeb)2(dmbpy)]2+, [Ru(deeb)2(bpy)]2+, and [Ru(deeb)3]2+ as well as [Ru(bpy) 3]2+ were incorporated. Reaction in aqueous solution eliminates the undesired solvent wastes. Oxidation of iodide to iodine in aqueous solution at neutral pH is thermodynamics feasible. Detail mechanistic studies of the iodide oxidation was the main results for this project. Another advantage of carrying the reaction in aqueous solution is that the product, iodine is more soluble in hexane. In the present of hexane, iodine was extracted into hexane phase. Efficient removal of products greatly increases the turn-over-number (TON) of the designed photocatalytic reaction. When [Ru(bpy)2deeb]2+ were used as catalyst and Co(NH3)5Cl2+ as sacrificial quencher, the TON was as high as 1351.
|Effective start/end date||2018/08/01 → 2019/07/31|
- Solar energy storage
- ruthenium bipyridine complexes
- oxidize halides
- bimolecular reaction
- turn-over-number (TON)
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