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Artificial Photosynthesis

Photoisomerization of active d-[Ru(tpy)(pynap)OH2]2+ water oxidation catalyst inhibited by immobilizing onto metal oxide electrodes

We have previously reported the mechanism of water oxidation catalyzed by d- and p-isomers of [Ru(tpy)(pynap)OH2]2+ (pynap = 2-(pyrid-2'-yl)-1,8-naphthyridine ) catalyst. While the d-isomer has shown high catalytic activity, the p-isomer was inactive toward water oxidation. In our new studies we have demonstrated the enhanced photoabsorption stability of the d-[Ru(tpy)(pynap)OH2]2+ catalyst when successfully attached onto oxide electrodes through a phosphonate linker. Electrochemical and photoelectrochemical results confirmed ruthenium oxidation chemistries and water oxidation proficiency remain largely unaffected by phosphonation and photo-isomerization of d-[Ru(H2PO3-tpy)(pynap)OH2]2+ is drastically inhibited when the catalyst is attached onto a rigid oxide electrode.

J. Catal. 2013, 307, 140–147, 10.1016/j.jcat.2013.07.018.

About the AP Group

We pursue the goal of advancing fundamental knowledge of processes leading to efficient conversion of sunlight to viable chemical fuels. We design and study chemical systems whose reactivity is inspired by natural photosynthesis, in which green plants convert sunlight, water and carbon dioxide into oxygen and carbohydrates.