期刊
JOURNAL OF POWER SOURCES
卷 205, 期 -, 页码 525-529出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.01.093
关键词
Iron oxide; Nanorod array; Electrochemical properties; Water splitting
资金
- FAPESP [2010/02464-6, 09/15558-1, 2011/01541-0]
- CAPES
- CNPq [555855/2010-4]
- Instituto Nacional em Eletronica Organica (INEO)
- NanoBioMed Brazil Network (CAPES)
- INCTMN
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/02464-6, 09/15558-1, 11/01541-0] Funding Source: FAPESP
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.
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