I shall introduce the Stephenson Institute for Renewable Energy, which is an interdisciplinary research centre set up by the University of Liverpool, its current staff and its research agenda. After this introduction to the institute and its researchers I shall present recent results of my research on titanium dioxide. Research on titanium dioxide, which occurs in multiple surface orientations, is one of the fastest growing areas in Physics and Chemistry, witnessed by an exponential growth in the number of research papers every year. The system is not only a prime candidate for photocatalytic chemistry, it is also the basis of dye-sensitized solar cells, or Graetzel cells . Among many candidates for photocatalysts, TiO2 is almost the only material suitable for industrial use at present and also probably in the future. This is because TiO2 has the most efficient photoactivity, the highest stability and the lowest cost . We want to discuss the fundamental properties of the material, explain why it is so versatile, and highlight some recent developments, which shed new light on the actual reaction mechanism on the rutile surface.