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Title: Meso-porous α-Fe{sub 2}O{sub 3} thin films synthesized via the sol-gel process for light-driven water oxidation

Abstract

This work reports a facile and cost-effective method for synthesizing photoactive α-Fe{sub 2}O{sub 3} films as well as their performances when used as photoanodes for water oxidation. Transparent α-Fe{sub 2}O{sub 3} meso-porous films were fabricated by template-directed sol-gel chemistry coupled with the dip-coating approach, followed by annealing at various temperatures from 350 degrees C to 750 degrees C in air. α-Fe{sub 2}O{sub 3} films were characterized by X-ray diffraction, XPS, FE-SEM and electrochemical measurements. The photoelectrochemical performance of α-Fe{sub 2}O{sub 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 degrees 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 under potential, although modest photocurrent density values (40 μAcm{sup -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 themore » optimization of photo-electrochemical water splitting. (authors)« less

Authors:
; ;  [1]; ; ;  [2];  [3]; ; ;  [4];  [2]
  1. Laboratoire de Chimie de la Matiere Condensee de Paris-UMR 7574, Universite Paris 6, College de France, 11 place Marcelin Berthelot 75005, Paris, (France)
  2. Laboratoire de Chimie et Biologie des Metaux, Universite Grenoble 1, CNRS, CEA, 17 rue des Martyrs 38054, Grenoble Cedex 9, (France)
  3. SPMS, MFE, CNRS-Ecole Centrale Paris et CEA, DEN, DMN, 91191 Gif-sur-Yvette, (France)
  4. CEA Institut Liten, DTNM/L2CE, 17 rue des Martyrs 38054, Grenoble Cedex 9, (France)
Publication Date:
OSTI Identifier:
22273977
Resource Type:
Journal Article
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Volume: 14; Journal Issue: 38; Other Information: Country of input: France; 68 refs.; This record replaces 45095210; Journal ID: ISSN 1463-9076
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 08 HYDROGEN; ANNEALING; CATALYSTS; COBALT; CRYSTAL STRUCTURE; HYDROGEN PRODUCTION; IRON OXIDES; MICROSTRUCTURE; NANOSTRUCTURES; OXIDATION; PHOTOANODES; SOL-GEL PROCESS; THIN FILMS; WATER; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Hamd, Wael, Laberty-Robert, Christel, Sanchez, Clement, Cobo, Saioa, Fize, Jennifer, Artero, Vincent, Baldinozzi, Gianguido, Schwartz, Wilfrid, Reymermier, Maryse, Pereira, Alexandre, Fontecave, Marc, and SPMS, MFE, CNRS-Ecole Centrale Paris et CEA, DEN, DMN, 91191 Gif-sur-Yvette,. Meso-porous α-Fe{sub 2}O{sub 3} thin films synthesized via the sol-gel process for light-driven water oxidation. United States: N. p., 2012. Web. doi:10.1039/C2CP42535A.
Hamd, Wael, Laberty-Robert, Christel, Sanchez, Clement, Cobo, Saioa, Fize, Jennifer, Artero, Vincent, Baldinozzi, Gianguido, Schwartz, Wilfrid, Reymermier, Maryse, Pereira, Alexandre, Fontecave, Marc, & SPMS, MFE, CNRS-Ecole Centrale Paris et CEA, DEN, DMN, 91191 Gif-sur-Yvette,. Meso-porous α-Fe{sub 2}O{sub 3} thin films synthesized via the sol-gel process for light-driven water oxidation. United States. doi:10.1039/C2CP42535A.
Hamd, Wael, Laberty-Robert, Christel, Sanchez, Clement, Cobo, Saioa, Fize, Jennifer, Artero, Vincent, Baldinozzi, Gianguido, Schwartz, Wilfrid, Reymermier, Maryse, Pereira, Alexandre, Fontecave, Marc, and SPMS, MFE, CNRS-Ecole Centrale Paris et CEA, DEN, DMN, 91191 Gif-sur-Yvette,. Sun . "Meso-porous α-Fe{sub 2}O{sub 3} thin films synthesized via the sol-gel process for light-driven water oxidation". United States. doi:10.1039/C2CP42535A.
@article{osti_22273977,
title = {Meso-porous α-Fe{sub 2}O{sub 3} thin films synthesized via the sol-gel process for light-driven water oxidation},
author = {Hamd, Wael and Laberty-Robert, Christel and Sanchez, Clement and Cobo, Saioa and Fize, Jennifer and Artero, Vincent and Baldinozzi, Gianguido and Schwartz, Wilfrid and Reymermier, Maryse and Pereira, Alexandre and Fontecave, Marc and SPMS, MFE, CNRS-Ecole Centrale Paris et CEA, DEN, DMN, 91191 Gif-sur-Yvette,},
abstractNote = {This work reports a facile and cost-effective method for synthesizing photoactive α-Fe{sub 2}O{sub 3} films as well as their performances when used as photoanodes for water oxidation. Transparent α-Fe{sub 2}O{sub 3} meso-porous films were fabricated by template-directed sol-gel chemistry coupled with the dip-coating approach, followed by annealing at various temperatures from 350 degrees C to 750 degrees C in air. α-Fe{sub 2}O{sub 3} films were characterized by X-ray diffraction, XPS, FE-SEM and electrochemical measurements. The photoelectrochemical performance of α-Fe{sub 2}O{sub 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 degrees 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 under potential, although modest photocurrent density values (40 μAcm{sup -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. (authors)},
doi = {10.1039/C2CP42535A},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
issn = {1463-9076},
number = 38,
volume = 14,
place = {United States},
year = {2012},
month = {7}
}