Solar spectrum and water-splitting efficiency

The efficiency to convert solar energy into chemical energy (H2) will be the main determining factor of hydrogen production costs using photocatalyst technology. As mentioned in the previous section, the thermodynamic 

Spectral region Interval boundaries 5olar irradiance  

The ideal limiting efficiency, 7iimit/ of any photonic process is given by (Archer and Bolton, 1990) 

Erom Equations (6)-(8), it might appear that there are many factors to be determined in the measurement of solar hydrogen photoproduction efficiencies however, in practice, efficiencies are measured using another form of Equation (6) (Serrano and de Lasa, 1997)  

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