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Kim, Jae Hong; Lee, Minah; Park, Chan Beum
Angewandte Chemie (International ed.), June 16, 2014, Volume: 53, Issue: 25Journal Article
We report on the capability of polydopamine (PDA), a mimic of mussel adhesion proteins, as an electron gate as well as a versatile adhesive for mimicking natural photosynthesis. This work demonstrates that PDA accelerates the rate of photoinduced electron transfer from light‐harvesting molecules through two‐electron and two‐proton redox‐coupling mechanism. The introduction of PDA as a charge separator significantly increased the efficiency of photochemical water oxidation. Furthermore, simple incorporation of PDA ad‐layer on the surface of conducting materials, such as carbon nanotubes, facilitated fast charge separation and oxygen evolution through the synergistic effect of PDA‐mediated proton‐coupled electron transfer and the high conductivity of the substrate. Our work shows that PDA is an excellent electron acceptor as well as a versatile adhesive; thus, PDA constitutes a new electron gate for harvesting photoinduced electrons and designing artificial photosynthetic systems. Nature as role model: Comparable to quinones that extract electrons from chlorophyll in the natural photosystem II, polydopamine (PDA) accelerates proton‐coupled electron transfer and enables efficient charge separation of Ru(bpy)32+. The introduction of PDA as an electron gate as well as a versatile adhesive significantly increases the efficiency of photochemical water oxidation.
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