Proton conduction properties of hydrous sulfated nano-titania synthesized by hydrolysis of titanyl sulfate

Sakai, Takaaki; Kajitani, Satoshi; Kim, Seok Jun; Hamagami, Jun‐ichi; Oda, Hiroyuki; Matsuka, Maki; Matsumoto, Hiroshige; Ishihara, Tatsumi

doi:10.1016/j.ssi.2010.09.053

Cited by 21 publications

(22 citation statements)

References 10 publications

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“…Among the inorganic acids, sulfated transition-metal oxides have become the subject of intensive studies, due to the high stability and extraordinary acidity of some of these compounds, as, for instance, sulfated zirconium oxide [1][2][3], sulfated tin oxide [4,5], and sulfated titanium oxide [6]. The latter has been widely studied in the past as a catalyst and as a proton conductor [7,8]. Recently, sulfated titania nanoparticles have been added to various polymers to form composite membranes with improved thermal and mechanical properties and enhanced proton conductivity [9].…”

Section: Introductionmentioning

confidence: 99%

Structural and Spectroscopic Characterization of A Nanosized Sulfated TiO2 Filler and of Nanocomposite Nafion Membranes

et al. 2016

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A large number of nano-sized oxides have been studied in the literature as fillers for polymeric membranes, such as Nafion ® . Superacidic sulfated oxides have been proposed and characterized. Once incorporated into polymer matrices, their beneficial effect on peculiar membrane properties has been demonstrated. The alteration of physical-chemical properties of composite membranes has roots in the intermolecular interaction between the inorganic filler surface groups and the polymer chains. In the attempt to tackle this fundamental issue, here we discuss, by a multi-technique approach, the properties of a nanosized sulfated titania material as a candidate filler for Nafion membranes. The results of a systematic study carried out by synchrotron X-ray diffraction, transmission electron microscopy, thermogravimetry, Raman and infrared spectroscopies are presented and discussed to get novel insights about the structural features, molecular properties, and morphological characteristics of sulphated TiO 2 nanopowders and composite Nafion membranes containing different amount of sulfated TiO 2 nanoparticles (2%, 5%, 7% w/w).

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Section: Introductionmentioning

confidence: 99%

Structural and Spectroscopic Characterization of A Nanosized Sulfated TiO2 Filler and of Nanocomposite Nafion Membranes

et al. 2016

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“…13 The resulting powder was heattreated in air at 400°C to fix the sulfuric acid to the surface of titania nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

“…The authors previously reported a proton conduction on the surface of hydrous titania nanoparticles prepared by a thermal decomposition of titanyl sulfate. 13 Proton conduction takes place on the surface of the oxide particles with the aid of the acid groups and adsorbed water molecules. Packed body of the hydrous titania powder with a relative density of approximately 60% showed the conductivity of around 10…”

Section: Introductionmentioning

confidence: 99%

Water Electrolysis Using Water-Absorbing Porous Electrolyte Consisting of a Sulfonated Nanotitania Proton Conductor

et al. 2012

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A sulfonated nanotitania proton conductor based on hydrous titania was applied to water electrolysis as a hydrogen production method from electricity. Hydrous titania in the form of nanoparticles was used as a water absorbing porous electrolyte to allow water transport to the anode via electrolyte part of the water electrolysis cell. Overpotential of the porous electrolyte cell in water was lower than that of the Nafion 117 membrane. Evolution of hydrogen and oxygen by electrolysis were confirmed although the rates of gas evolution were smaller than those calculated from Faraday's law.

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“…The conditions of the measurement were almost the same as those in our previous work [11]. The sample powder obtained was shaped into a bar at 300 MPa with a cold isostatic press.…”

Section: Conductivity Measurementsmentioning

confidence: 99%

“…We have already reported the proton conduction properties of sulfuric acid-modified nano-titania synthesized by hydrolysis of titanyl sulfate; its conductivity reached as high as 0.1 S cm −1 at 50°C under a relative humidity of 80% [11]. However, in the case of hydrolysis of titanyl sulfate, control of the amount of sulfate groups adsorbed on nano-titania is difficult.…”

Section: Introductionmentioning

confidence: 99%

Proton conduction properties of nano-titania modified by sulfuric acid impregnation

Sakai

Kim

Kajitani

et al. 2011

J Solid State Electrochem

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The proton conduction properties of sulfuric acidmodified nano-titania prepared by impregnation method were investigated. The proton conductivity of sulfuric acid-modified nano-titania was almost the same as that of hydrous sulfated nano-titania investigated in our previous work when the amount of adsorbed sulfate groups was almost the same. The highest conductivity was obtained at an adsorbed sulfate group amount of 0.42 mmol/g, not 0.97 mmol/g. This result indicates that the enhancement of conductivity with increasing amount of adsorbed sulfate groups is limited. This might be attributable to insufficient water molecule adsorption on the Ti 4+ site coordinated with a bidentate sulfate group due to the prevention by excess sulfuric acid.

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Proton conduction properties of hydrous sulfated nano-titania synthesized by hydrolysis of titanyl sulfate

Abstract: Proton conduction properties of hydrous sulfated nano-titania synthesized by hydrolysis of titanyl sulfate

Cited by 21 publications

References 10 publications

Structural and Spectroscopic Characterization of A Nanosized Sulfated TiO2 Filler and of Nanocomposite Nafion Membranes

Structural and Spectroscopic Characterization of A Nanosized Sulfated TiO2 Filler and of Nanocomposite Nafion Membranes

Water Electrolysis Using Water-Absorbing Porous Electrolyte Consisting of a Sulfonated Nanotitania Proton Conductor

Proton conduction properties of nano-titania modified by sulfuric acid impregnation

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