Luminescent greenhouse solar collectors are potentially useful for concentrating sunlight onto photovoltaic power cells. Measurements of the performance of small-scale collectors made of two commercially available materials (Owens-Illinois ED2 neodymium-doped laser glass and rhodamine 6G-doped plastic) are presented. The results are encouraging, but they indicate a need for further spectral sensitization and for reduced matrix loss coefficient. The measurements with monochromatic illumination agree with the predictions of a mathematical model developed to take account of reemission following the absorption of luminescence. Under solar illumination, the model predicts photon flux concentrations of about 15 for optimized full-scale collectors made of the materials studied and concentrations of 110 for reasonably improved glass.
Heterogeneous rate constants for the anodic oxidation of many inorganic and organic compounds at electrolytically deposited
normalbeta‐PbO2
film electrodes in
1.0M HClO4
are increased by doping the oxide with Bi(III). The rate constants at the mixed‐oxide electrode rise sharply for a change from 0 to 10 mole percent (m/o) of Bi(III) in the electrodeposition solution, and reach a mass transport‐limited value for some compounds at 40 m/o Bi(III). Results of kinetic, voltammetric, and spectroscopic studies of these electrodes are described. In addition, the lifetime of Bi(III)‐doped
PbO2
film electrodes is discussed as a function of concentration, rotation speed, analyte, and applied voltage.
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