Mesoporous α-Fe2O3 thin films synthesized via the sol-gel process for light-driven water oxidationElectronic supplementary information (ESI) available. See DOI: 10.1039/c2cp42535a
This work reports a facile and cost-effective method for synthesizing photoactive α-Fe 2 O 3 films as well as their performances when used as photoanodes for water oxidation. Transparent α-Fe 2 O 3 mesoporous films were fabricated by template-directed sol-gel chemistry coupled with the dip-coating a...
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Main Authors | , , , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
17.09.2012
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Abstract | This work reports a facile and cost-effective method for synthesizing photoactive α-Fe
2
O
3
films as well as their performances when used as photoanodes for water oxidation. Transparent α-Fe
2
O
3
mesoporous films were fabricated by template-directed sol-gel chemistry coupled with the dip-coating approach, followed by annealing at various temperatures from 350 °C to 750 °C in air. α-Fe
2
O
3
films were characterized by X-ray diffraction, XPS, FE-SEM and electrochemical measurements. The photoelectrochemical performance of -Fe
2
O
3
photoanodes was characterized and optimized through the deposition of Co-based co-catalysts
via
different methods (impregnation, electro-deposition and photo-electro-deposition). Interestingly, the resulting hematite films heat-treated at relatively low temperature (500 C), and therefore devoid of any extrinsic dopant, achieve light-driven water oxidation under near-to-neutral (pH = 8) aqueous conditions after decoration with a Co catalyst. The onset potential is 0.75 V
vs.
the reversible hydrogen electrode (RHE), thus corresponding to 450 mV light-induced underpotential, although modest photocurrent density values (40 A cm
2
) are obtained below 1.23 V
vs.
RHE. These new materials with a very large interfacial area in contact with the electrolyte and allowing for a high loading of water oxidation catalysts open new avenues for the optimization of photo-electrochemical water splitting.
Mesostructured hematite films display original photoelectrocatalytic response for water oxidation when coupled with Co-based catalysts. |
---|---|
AbstractList | This work reports a facile and cost-effective method for synthesizing photoactive α-Fe
2
O
3
films as well as their performances when used as photoanodes for water oxidation. Transparent α-Fe
2
O
3
mesoporous films were fabricated by template-directed sol-gel chemistry coupled with the dip-coating approach, followed by annealing at various temperatures from 350 °C to 750 °C in air. α-Fe
2
O
3
films were characterized by X-ray diffraction, XPS, FE-SEM and electrochemical measurements. The photoelectrochemical performance of -Fe
2
O
3
photoanodes was characterized and optimized through the deposition of Co-based co-catalysts
via
different methods (impregnation, electro-deposition and photo-electro-deposition). Interestingly, the resulting hematite films heat-treated at relatively low temperature (500 C), and therefore devoid of any extrinsic dopant, achieve light-driven water oxidation under near-to-neutral (pH = 8) aqueous conditions after decoration with a Co catalyst. The onset potential is 0.75 V
vs.
the reversible hydrogen electrode (RHE), thus corresponding to 450 mV light-induced underpotential, although modest photocurrent density values (40 A cm
2
) are obtained below 1.23 V
vs.
RHE. These new materials with a very large interfacial area in contact with the electrolyte and allowing for a high loading of water oxidation catalysts open new avenues for the optimization of photo-electrochemical water splitting.
Mesostructured hematite films display original photoelectrocatalytic response for water oxidation when coupled with Co-based catalysts. |
Author | Hamd, Wael Fize, Jennifer Cobo, Saioa Laberty-Robert, Christel Schwartz, Wilfrid Artero, Vincent Reymermier, Maryse Pereira, Alexandre Fontecave, Marc Sanchez, Clement Baldinozzi, Gianguido |
AuthorAffiliation | Université Paris 6 Collège de France Laboratoire de Chimie et Biologie des Métaux DMN SPMS CEA Institut Liten (DTNM/L2CE) Université Grenoble 1 Laboratoire de Chimie de la Matière Condensée de Paris-UMR 7574 DEN CNRS-Ecole Centrale Paris & CEA MFE CNRS CEA |
AuthorAffiliation_xml | – name: MFE – name: DMN – name: CNRS – name: CNRS-Ecole Centrale Paris & CEA – name: Collège de France – name: SPMS – name: Université Grenoble 1 – name: Université Paris 6 – name: Laboratoire de Chimie et Biologie des Métaux – name: CEA – name: CEA Institut Liten (DTNM/L2CE) – name: Laboratoire de Chimie de la Matière Condensée de Paris-UMR 7574 – name: DEN |
Author_xml | – sequence: 1 givenname: Wael surname: Hamd fullname: Hamd, Wael – sequence: 2 givenname: Saioa surname: Cobo fullname: Cobo, Saioa – sequence: 3 givenname: Jennifer surname: Fize fullname: Fize, Jennifer – sequence: 4 givenname: Gianguido surname: Baldinozzi fullname: Baldinozzi, Gianguido – sequence: 5 givenname: Wilfrid surname: Schwartz fullname: Schwartz, Wilfrid – sequence: 6 givenname: Maryse surname: Reymermier fullname: Reymermier, Maryse – sequence: 7 givenname: Alexandre surname: Pereira fullname: Pereira, Alexandre – sequence: 8 givenname: Marc surname: Fontecave fullname: Fontecave, Marc – sequence: 9 givenname: Vincent surname: Artero fullname: Artero, Vincent – sequence: 10 givenname: Christel surname: Laberty-Robert fullname: Laberty-Robert, Christel – sequence: 11 givenname: Clement surname: Sanchez fullname: Sanchez, Clement |
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Notes | 10.1039/c2cp42535a Electronic supplementary information (ESI) available. See DOI |
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Snippet | This work reports a facile and cost-effective method for synthesizing photoactive α-Fe
2
O
3
films as well as their performances when used as photoanodes for... |
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Title | Mesoporous α-Fe2O3 thin films synthesized via the sol-gel process for light-driven water oxidationElectronic supplementary information (ESI) available. See DOI: 10.1039/c2cp42535a |
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