Journal
CHEMSUSCHEM
Volume 8, Issue 1, Pages 172-176Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402577
Keywords
carbon; charge transfer; photochemistry; tungsten; water splitting
Funding
- Korea Institute of Materials Science (KIMS)
- BioSolarCells program of the Foundation for Fundamental Research on Matter, The Netherlands
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We show that a graphitic carbon interfacial layer, derived from C-70 by annealing at 500 degrees C, results in a significant increase in the attainable photocurrent of a photoelectrochemical cell that contains a WO3-functionalized fluorine-doped tin oxide (FTO) photoanode. Time-resolved photoluminescence spectroscopy, photoconductive atomic force microscopy, Hall measurements, and electrochemical impedance spectroscopy show that the increase in photocurrent is the result of fast and selective electron transport from optically excited WO3 through the graphitic carbon interfacial layer to the FTO-coated glass electrode. Thus the energy efficiency of perspective solar-to-fuel devices can be improved by modification of the interface of semiconductors and conducting substrate electrodes by using graphitized fullerene derivatives.
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