For the first time, hematite nanorods were successfully synthesised using iron nitrate precursors in the presence of cation SO₄^-2. This is also the first time that an investigation into hematite nanorods behaviour for hydrogen fuel storage has been carried out. Microspheres constructed with α-FeOOH nanorods were synthesised via a novel hydrothermal method using a mixture of Fe(NO₃)₃ · 4H₂O and Na₂SO₄ as the initial material. The α-FeOOH was transformed into hematite (α-Fe₂O ₃) nanorods through an annealing process at 600°C for 2 h. The influence of different anions on the formation of hematite α-Fe ₂O₃ nanorods was investigated. Experimental results proved that the addition of Na₂SO₄ solution controlled the morphology of α-Fe₂O₃. Its structure and morphology were investigated using XRD, SEM and Raman techniques. The kinetic curve of hydrogen generation of some hematite morphology samples was examined by redox cycle and the hydrogen fuel was formed by oxidation with water vapour. Although the nanorod morphology of hematite samples was damaged during redox cycles, the samples demonstrated high activity for hydrogen generation in comparison with precipitation and sol gel samples. The ratio of H₂/Fe of nano-rod samples for two redox cycles was 1.91% and 1.76%, respectively. Thus, hematite nanorods are a promising material for storages of hydrogen fuel. Copyright © 2011 Inderscience Enterprises Ltd.

Tho V.D.S., Anh L.T.L., Trung N.N., Van Thang P., Hieu N.D., Hung P.P., Son V.T., Thai T.T.

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