A Self-Assembled Organic/Metal Junction for Water Photo- Oxidation

摘要

We report the in situ self-assembly of TTF, TTF center dot+, and BF4- or PF6- into p-type semiconductors on the surface of Pt microparticles dispersed in water/acetonitrile mixtures. The visible light photoactivation of these self-assemblies leads to water oxidation forming O-2 and H+, with an efficiency of 100% with respect to the initial concentration of TTF center dot+. TTF center dot+ is then completely reduced to TTF upon photoreduction with water. The Pt microparticles act as floating microelectrodes whose Fermi level is imposed by the different redox species in solution; here predominantly TTF, TTF center dot+, and HTTF+, which furthermore showed no signs of decomposition in solution.