The influence of platinum(IV) ions on the formation of iron oxides in a highly alkaline medium

Krehula, Stjepko; Musić, Svetozar

doi:10.1016/j.molstruc.2010.09.037

Cited by 5 publications

(4 citation statements)

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“…The average crystalline size was calculated by Scherrer’s equation: d = K λ β .25em cos nobreak0em.25em⁡ θ where K is a constant related to the crystalline shape (0.89), β is the pure breadth of the reflection pattern (free of instrument-induced broadening), and θ is the diffraction angle. Germanium powder was used as an internal standard for the least-squares method calculation of the lattice constants using the XLAT Cell Constant Refinement software . The Al content in the powders was measured using energy dispersive X-ray spectroscopy (EDS, Oxford).…”

Section: Methodsmentioning

confidence: 99%

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO₂

Garrett

2012

J. Phys. Chem. C

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TiO2 is widely available as a chemically stable and harmless material. Recently, it has received a great deal of attention as a practical thermoelectric material. In this work, we studied the effects of aluminum (Al) doping concentration and lattice parameter on the thermoelectric properties of TiO2 at both room and high temperatures (475 °C). We found that the Al doping leads to a compression in the lattice constant and an increase in carrier concentration and consequently increases the electrical conductivity in the TiO2. We observed that the Al-doped TiO2 thin film shows a negative Seebeck coefficient and its value linearly decreases with increasing electrical conductivity. This result indicates that the Seebeck effect is developed by entropy-driven thermally assisted charge diffusion between low- and high-temperature surfaces. Further studies found that doping-induced reduction on entropy difference through electrical conductivity is accountable for the decrease of the Seebeck effect in the Al-doped TiO2. However, the Al doping can lead to phonon scattering at grain boundary interfaces and consequently decreases thermal conductivity. Therefore, the Al doping can essentially function as a mechanism to separately adjust electrical and thermal conductivities in the Al-doped TiO2. With Al doping, we obtained a maximal figure of merit (Z value) to be 1.30 at 475 °C and 0.48 At 23 °C from the Al-doped TiO2 at the doping concentration of 3%. The comparison of Z values between room and high temperatures confirms that thermally assisted charge diffusion and phonon scattering are two critical parameters for the development of efficient thermoelectric function in the Al-doped TiO2.

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Section: Methodsmentioning

confidence: 99%

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO₂

Garrett

2012

J. Phys. Chem. C

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“…In our previous studies [17][18][19][20][46][47][48][49] we have investigated the influence of various metal cations on the formation of iron oxides in a highly alkaline medium in the presence of TMAH. Formation of Fe 3 O 4 has been observed only in the case of the platinum group metal cations (ruthenium, palladium, platinum and rhodium) [18,[46][47][48][49], well known for their excellent catalytic properties.…”

Section: X-ray Powder Diffractionmentioning

confidence: 99%

“…Formation of Fe 3 O 4 has been observed only in the case of the platinum group metal cations (ruthenium, palladium, platinum and rhodium) [18,[46][47][48][49], well known for their excellent catalytic properties. In the absence of the platinum group metal ions Fe 3+ ions have not been reduced and only Fe(III) oxides have been formed [17,19,20,27,28].…”

Section: X-ray Powder Diffractionmentioning

confidence: 99%

“…In the absence of the platinum group metal ions Fe 3+ ions have not been reduced and only Fe(III) oxides have been formed [17,19,20,27,28]. On the other hand, in the presence of even a small amount (1 mol% or less) of platinum group metal ions ␣-FeOOH has been completely transformed to Fe 3 O 4 [18,[46][47][48][49]. On the basis of these observations, it can be concluded that the platinum group metals act as catalysts for the transformation ␣-FeOOH → Fe 3 O 4 in the presence of TMAH.…”

Section: X-ray Powder Diffractionmentioning

confidence: 99%

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The effect of iridium(III) ions on the formation of iron oxides in a highly alkaline medium

Krehula

Musić

2012

Journal of Alloys and Compounds

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Direct monophasic replacement of fatty acid by DMSA on SPION surface

Gogoi

Deb

Vasan

et al. 2012

Applied Surface Science

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The influence of platinum(IV) ions on the formation of iron oxides in a highly alkaline medium

Cited by 5 publications

References 65 publications

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO₂

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO₂

The effect of iridium(III) ions on the formation of iron oxides in a highly alkaline medium

Direct monophasic replacement of fatty acid by DMSA on SPION surface

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The influence of platinum(IV) ions on the formation of iron oxides in a highly alkaline medium

Cited by 5 publications

References 65 publications

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO2

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO2

The effect of iridium(III) ions on the formation of iron oxides in a highly alkaline medium

Direct monophasic replacement of fatty acid by DMSA on SPION surface

Contact Info

Product

Resources

About

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO₂

Doping Effects on Internally Coupled Seebeck Coefficient, Electrical, and Thermal Conductivities in Aluminum-Doped TiO₂