A Facile Electrochemical Reduction Method for Improving Photocatalytic Performance of α‑Fe2O3 Photoanode for Solar Water Splitting

A Facile Electrochemical Reduction Method for Improving Photocatalytic Performance of α‑Fe2O3 Photoanode for Solar Water Splitting

Electrochemical reduction method is used for the first time to significantly improve the photo-electrochemical performance of α-Fe2O3 photoanode prepared on fluorine-doped tin oxide substrates by spin-coating aqueous solution of Fe­(NO3)3 followed by thermal annealing in air. Photocurrent density of...

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Veröffentlicht in:ACS applied materials & interfaces 2017-01, Vol.9 (1), p.381-390
Hauptverfasser: Wang, Jue, Waters, Joseph L, Kung, Patrick, Kim, Seongsin M, Kelly, John T, McNamara, Louis E, Hammer, Nathan I, Pemberton, Barry C, Schmehl, Russell H, Gupta, Arunava, Pan, Shanlin
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container_issue 1
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container_title ACS applied materials & interfaces
container_volume 9
creator Wang, Jue
Waters, Joseph L
Kung, Patrick
Kim, Seongsin M
Kelly, John T
McNamara, Louis E
Hammer, Nathan I
Pemberton, Barry C
Schmehl, Russell H
Gupta, Arunava
Pan, Shanlin
description Electrochemical reduction method is used for the first time to significantly improve the photo-electrochemical performance of α-Fe2O3 photoanode prepared on fluorine-doped tin oxide substrates by spin-coating aqueous solution of Fe­(NO3)3 followed by thermal annealing in air. Photocurrent density of α-Fe2O3 thin film photoanode can be enhanced 25 times by partially reducing the oxide film to form more conductive Fe3O4 (magnetite). Fe3O4 helps facilitate efficient charge transport and collection from the top α-Fe2O3 layer upon light absorption and charge separation to yield enhanced photocurrent density. The optimal enhancement can be obtained for
doi_str_mv 10.1021/acsami.6b11057
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Photocurrent density of α-Fe2O3 thin film photoanode can be enhanced 25 times by partially reducing the oxide film to form more conductive Fe3O4 (magnetite). Fe3O4 helps facilitate efficient charge transport and collection from the top α-Fe2O3 layer upon light absorption and charge separation to yield enhanced photocurrent density. The optimal enhancement can be obtained for &lt;50 nm films because of the short charge transport distance for the α-Fe2O3 layer. Thick α-Fe2O3 films require more charge and overpotential than thinner films to achieve limited enhancement because of the sluggish charge transport over a longer distance to oxidize water. 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title A Facile Electrochemical Reduction Method for Improving Photocatalytic Performance of α‑Fe2O3 Photoanode for Solar Water Splitting
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