Publication date: 15th December 2014
The investigation of properties of materials for application in the green energy segment has attracted enormous attention. Water splitting using a semiconductor and solar energy is one of the most environmentally friendly ways of producing renewable fuels from abundant resources. The oxygen evolution reaction (OER) is of particular interest as it is considered limiting for the overall water splitting due to slow kinetics.For the catalytic characterization of new materials, which promise photocatalytic activity in the OER, a photoreactor has been designed and built. It consists of a reactor vessel placed on a magnetic stirrer. Inside the vessel is an immersion tube with a 150 W Xenon-Lamp in a cooling tube composed of glass with a UV-filter (>340 nm). Additionally there is an argon-inlet with a frit to ensure a fine distribution of the carrier gas in the liquid. Above the vessel is a (pressure-equalizing)droppingfunnel for the addition of the sacrificial agent as well as a reflux condenser with an overpressure valve, which ensures a safe sealed system.To characterize the reactor,various parameters including argon volume flow, catalyst mass and amount of sacrificial agent were variedand the oxygen evolution was measured with an electrochemical oxygen analyzer. Furthermore, the filling volume in the reactor vessel, the stirring velocity, the drop rate of the sacrificial agent and the temperature will be adjusted to optimal conditions.By observing the reaction for several hours, it is possible to measure both the initial rate of a system and the overall oxygen evolution. The reaction conditions were optimized using tungsten(VI) trioxide as a photoactive catalyst and silver nitrate as sacrificial agent.A stable and reproducible oxygen evolution rate of 26.5 μmol min−1 g−1 was detected. The setup will be used to investigate new semiconductor and co-catalyst systems, which promise beneficial photocatalytic activity, like Mn-doped TaON. First results will be presented.The authors acknowledge the support of the German Science Foundation (DFG) in the frame of the priority program 1613.
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