Abstract
AbstractThe (photo) electrochemical insertion of hydrogen into a pyrite electrode was studied in an electrochemical two compartment cell. Investigation of the oxidative hydrogen release through the palladium covered back side permitted the determination of relevant kinetic and energetic properties. Hydrogen was found to diffuse with a diffusion coefficient of D = 10−5 cm2/s after sufficient traps (1018 per cm3) were saturated. Upon illumination the hydrogen permeation rate P(P = ratio of penetrating hydrogen atoms to electrochemically reduced protons) can be increased from P = 0.45 up to P = 0.80. The mechanism responsible for the photoinduced insertion and transport of hydrogen is analyzed. The relevance of photo induced proton insertion mechanisms for information storage and energy conversion is discussed.
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