Tributsch, H. ; Neumann, B.: Material research challenges towards a corrosion stable photovoltaic hydrogen-generating membrane. International Journal of Hydrogen Energy 32 (2007), p. 2679-2688
Abstract Material research problems towards a Ti-based Tandem membrane with corrosion resistant TiO2 surfaces for direct light induced hydrogen generation are outlined. Since doping of TiO2 with C and N interferes with oxygen evolution via the radical pathway, oxygen evolution via the 4-electron pathway has to be explored. For this purpose the incorporation of suitable catalysts into the TiO2 is necessary, which have to collect holes from gap states. A model of the membrane in form of a CIS solar cell in series with the anodic TiO2 photoreaction and the cathodic hydrogen evolution at a Pt-wire was tested to be active. UV- and visible light photocurrent imaging and differential electrochemical mass-spectroscopy as well as surface photovoltage measurements are used to investigate material and system properties.