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Metal-Free Photocatalytic Graphitic Carbon Nitride on p-Type Chalcopyrite as a Composite Photocathode for Light-Induced Hydrogen Evolution

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons41525

Lublow,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21308

Arrigo,  Rosa
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Yang, F., Lublow, M., Orthmann, S., Merschjann, C., Tyborski, T., Rusu, M., et al. (2012). Metal-Free Photocatalytic Graphitic Carbon Nitride on p-Type Chalcopyrite as a Composite Photocathode for Light-Induced Hydrogen Evolution. ChemSusChem: chemistry & sustainability, energy & materials, 5(7), 1227-1232. doi:10.1002/cssc.201100691.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-1BD4-E
Abstract
Recently, it has been shown that an abundant material, polymeric carbon nitride, can produce hydrogen from water under visible-light irradiation in the presence of a sacrificial donor. We present herein the preparation and characterization of graphitic carbon nitride (g-C3N4) films on p-type semiconducting CuGaSe2 chalcopyrite thin-film substrates by thermal condensation of a dicyandiamide precursor under inert-gas conditions. Structural and surface morphological studies of the carbon nitride films suggest a high porosity of g-C3N4 thin films consisting of a network of nanocrystallites. Photoelectrochemical investigations show light-induced hydrogen evolution upon cathodic polarization for a wide range of proton concentrations in the aqueous electrolyte. Additionally, synchrotron radiation-based photoelectron spectroscopy has been applied to study the surface/near-surface chemical composition of the utilized g-C3N4 film photocathodes. For the first time, it has been shown that g-C3N4 films coated on p-type CuGaSe2 thin films can be successfully applied as new photoelectrochemical composite photocathodes for light-induced hydrogen evolution.