Decoupling Feature Size and Functionality in Solution-Processed, Porous Hematite Electrodes for Solar Water Splitting

We introduce a simple solution-based strategy to decouple morphological and functional effects of annealing nanostructured, porous electrodes by encapsulation with a SiO2 confinement scaffold before high temperature treatment We demonstrate the effectiveness of this approach using porous hematite (alpha-Fe2O3) photoanodes applied for the storage of solar energy via water splitting and show that the feature size and electrode functionality due to dopant activation can be independently controlled This allows a significant increase in water oxidation photocurrent from 1 57 mA cm(-2) (in the control case) to 2 34 mA cm(-2) under standard illumination conditions in 1 M NaOH electrolyte the highest reported for a solution-processed hematite photoanode This increase is attributed to the improved quantum efficiency, especially with longer wavelength photons, due to a smaller particle size, which is afforded by our encapsulation strategy


Published in:
Nano Letters, 10, 4155-4160
Year:
2010
Publisher:
American Chemical Society
ISSN:
1530-6984
Keywords:
Laboratories:




 Record created 2011-12-16, last modified 2018-03-17


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