The photocatalytic water oxidation activity of the Ru-CTF molecular hybrid material was analyzed in the presence of persulfate as a SEA in aqueous buffered solution at pH 7. In a typical experiment, 1 mg (0.10 mols of Ru) of Ru-CTF powder were dispersed in 1-6 mL of a 25 mM pH 7 phosphate buffer (phbf) solution containing 10 mM sodium persulfate as a sacrificial electron acceptor, and placed in a jacketed quartz reactor maintained at 25 o C under Ar atmosphere (see SI for additional details). The dispersion was then irradiated over time in full arc with a Xenon lamp source (150 W) at 3 suns and the oxygen generated was measured in situ in the head space with a Clark electrode. A plot of O2 generation vs. time under these conditions using 6 mL as the final volume, is presented in Fig. and Fig. , giving a TOF of 17 h -1 (4.7x10 -3 s -1 ), a TON of 79 after approx. 8 h and with a chemical efficiency in the range of 80% and AQY of 1.4% (Table , entry 2). At the end of this experiment the Ru-CTF material is recovered by centrifugation rinsed with water and reused again giving practically the same the performance. Repeating this protocol three times gives and overall TON of 220 (See Fig. ). The recycling experiment indicates that the Ru-CTF hybrid material remain intact after the photocatalytic experiment and that the limiting factor is thus the concentration of the sacrificial agent, that is progressively depleted as the water oxidation reaction proceeds.