This book collects the lectures delivered by the Authors during the NATO
ASI "Fundamentals and Developments of Photocatalytic and
Photoelectrochemical Processes", held in Erice (Trapani, Italy) from May
20th to June 2nd 1984. The ASI was devoted to the general field of
photochemical conversion and storage of solar energy. It had the aim of
defining the "state of art" and of outlining perspectives, lines of
development and practic al utilization of this form of energy. The world
energy crisis has stimulated scientists to investigate new routes for
finding and testing methods and processes for obtaining renewable and
cheap sources of energy. Within this framework, the possibility of solar
energy utilization on a large scale must overcome the stage of
discovering efficient processes for the photochemical conversion and for
the storage. The most promising way for achieving this goal seems the
photosplitting of water and related reactions. The methods for obtaining
the water photosplitting are essentially based on photoelectrochemical
cells and on photocatalytic systems (gas-solid and gas-liquid-solid).
Extensive research work is currently done all over the world both in
universities and in industrial laboratories in these areas. The ASI has
given to the audience a general view of the fundamental aspects and as
much as possible a detailed insight of the various methods and
processes. A section has been also devoted to the photoreactors, a field
in which the interest is ix x FOREWORD steadily increasing and whose
development is essential for the practical exploitation of the various
methods.