Photoelectrochemical Solar Fuel Production: From Basic by Sixto Giménez, Juan Bisquert (eds.)

By Sixto Giménez, Juan Bisquert (eds.)

This e-book explores the conversion for solar power into renewable liquid fuels via electrochemical reactions. the 1st part of the e-book is dedicated to the theoretical basics of sun fuels construction, targeting the skin houses of semiconductor fabrics involved with aqueous suggestions and the response mechanisms. the second one part describes a suite of present, appropriate characterization ideas, which offer crucial info of the band constitution of the semiconductors and service dynamics on the interface semiconductor.  The 3rd, and final part includes the newest advancements in fabrics and engineered constructions to optimize the functionality of solar-to-fuel conversion units.

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13) shows that EFp will move 59 meV closer to the valence band for each factor of 10 increase in light intensity. For slower reactions, the hole QFL will be so close to the valence band that essentially qη becomes EF,redox À EV. This overpotential is clearly related to the concentration of holes and not to the potential drop in the Helmholtz layer; in other words, it arises from the entropic term in the free energy and not from the internal (potential-dependent) term. It is worth noting here that the applicability of the quasi Fermi-level concept (Reineke and Memming 1992a, b) to reactions at semiconductor photoelectrodes was the subject of considerable discussion in the early years of photoelectrochemistry, when Nozik (1978) suggested that a stochastic model of charge transfer was more appropriate than the statistical model inherent in the quasi-Fermi level approach.

It is important to note that although the electrical potential varies with distance, the electrochemical potential of electrons is constant across the junction at equilibrium, as indicated by the horizontal line representing the Fermi energy. This means that in the dark at equilibrium, there is no driving force for the separation of thermally generated electrons and holes. The variations of equilibrium electron density and electrical potential with distance are such that μn is constant (cf. Eq.

The removal of electrons from the semiconductor leaves behind a region of positive space charge near the semiconductor surface, consisting of ionized donors. If we make the simplifying assumption that we can neglect the charge due to electrons in the space charge region (SCR) of width WSC (the abrupt depletion approximation), the electric field and potential distribution in this space charge region can be obtained by integrating Poisson’s equation in one dimension. M. Peter Fig. 4 Formation of a Schottky barrier between an n-type semiconductor and a metal with a higher work function.

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