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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.)

Highly oriented hematite nanorods arrays for photoelectrochemical water splitting

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Author(s):
de Carvalho, Vitor A. N. [1] ; Luz, Roberto A. de S. [1] ; Lima, Bruno H. [2] ; Crespilho, Frank N. [3, 1] ; Leite, Edson R. [2] ; Souza, Flavio L. [1]
Total Authors: 6
Affiliation:
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Grp Mat & Metodos Avancados, BR-09090400 Santo Andre, SP - Brazil
[2] PPGCEM Univ Fed Sao Carlos, BR-13565905 Sao Carlos, SP - Brazil
[3] Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Power Sources; v. 205, p. 525-529, MAY 1 2012.
Web of Science Citations: 50
Abstract

We report an oriented hematite undoped photanode synthesized by single chemical route step at low temperature and with a short reaction time. Fluorine-doped tin oxide (FTO) electrodes modified with hematite nanorod (450 nm of thickness) showed a photocurrent with 0.9 mA cm(-2) at 0.4 V vs Ag/AgCl. Also, we have done electrochemical characterizations under dark conditions in order to understand the catalytic properties of the photoanode. Based on cyclic voltammetry results we have proposed a new mechanism to explain the evolution of molecular oxygen onto oriented hematite surfaces, in which is not inconsistent with thermodynamical parameters extracted from the Pourbaix diagram. A chemical interaction between OH- and iron oxide from the surface suggested that the chemical reaction is first governed by oxy-hydroxides on the electrode/electrolyte interface. In other word, molecular oxygen evolution is preceded by the formation of oxy-hydroxide groups, a slow and possibly limiting step. (C) 2012 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 09/15558-1 - Biomolecules and cellular system interaction with nanostructures 0D, 1D and 2D by using electrochemical methods
Grantee:Frank Nelson Crespilho
Support Opportunities: Regular Research Grants
FAPESP's process: 10/02464-6 - Study of nanostructure of metalic oxide applied in photovoltaic cells
Grantee:Flavio Leandro de Souza
Support Opportunities: Regular Research Grants
FAPESP's process: 11/01541-0 - Development of bioanodes composed by glucose oxidase and fructose dehydrogenase and its recombinant structures for aplication in prototype of biofuel cell: power generation from biomass (sugar cane)
Grantee:Frank Nelson Crespilho
Support Opportunities: Regular Research Grants