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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

High temperature activation of hematite nanorods for sunlight driven water oxidation reaction

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Ito, Nathalie Minko [1] ; Carvalho, Jr., Waldemir Moura [1] ; Muche, Dereck Nills Ferreira [2, 3] ; Castro, Ricardo Hauch Ribeiro [2, 3] ; Dalpian, Gustavo Martini [1] ; Souza, Flavio Leandro [2, 3, 1]
Total Authors: 6
[1] Univ Fed ABC, CCNH, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Calif Davis, Dept Mat Sci & Engn, One Shields Ave, Davis, CA 95616 - USA
[3] Univ Calif Davis, NEAT ORU, One Shields Ave, Davis, CA 95616 - USA
Total Affiliations: 3
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 19, n. 36, p. 25025-25032, SEP 28 2017.
Web of Science Citations: 3

Here we show that chlorine species originating from commonly used iron precursors annihilate the hematite nanorod photocurrent by providing recombination pathways. Although hematite nanorod films could be obtained by thermal decomposition of the iron oxyhydroxide phase (beta-FeOOH), indistinguishable photocurrent responses under dark and sunlight irradiation conditions were observed until the nanorods were annealed (activated) at 750 degrees C. The annealing led to the elimination of observable chlorine species and allowed photocurrent responses of 1.3 mA cm(-2) at 1.23 V vs. RHE, which is comparable to the best results found in the literature, suggesting that residual chlorine species from the synthesis can act as electron traps and recombination sites for photogenerated holes. (AU)

FAPESP's process: 16/02157-2 - Understanding the hematite nanostructured surface performing water adsorption microcalorimetry
Grantee:Flavio Leandro de Souza
Support type: Scholarships abroad - Research
FAPESP's process: 13/05471-1 - Effect of dopants in semiconductor nanostructures and their impact on photocatalytic performance
Grantee:Waldemir Moura de Carvalho Junior
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach
Grantee:Carlos Rettori
Support type: Research Projects - Thematic Grants