Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 24, Pages 11834-11842Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp55174a
Keywords
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Funding
- Centre of Artificial Photosynthesis, NTU
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In natural photosynthesis, the water splitting reaction of photosystem II is the source of the electrons/ reducing equivalents for the reduction of carbon dioxide to carbohydrate while oxygen is formed as the by-product. Similarly, for artificial photosynthesis where the end product is a solar fuel such as hydrogen, a water splitting-oxygen evolving system is required to supply high energy electrons to drive the reductive reactions. Very attractive candidates for this purpose are iron based semiconductors which have band gaps corresponding to visible light and valence band energies sufficient to oxidise water. The most studied system is hematite (Fe2O3) which is highly abundant with many attributes for incorporation into photoelectrochemical (PEC) cells. We review the recent progress in manipulating hematite for this purpose through nanostructuring, doping and surface modifications. We also consider several hybrid iron-based semiconducting systems like ferrites and iron titanates as alternatives to hematite for light driven water splitting emphasizing their advantages with respect to their band levels and charge transport properties.
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