Effect of the addition of hydrated titanium oxide on proton conductivity for aromatic polymer electrolyte membrane

Onuma, Atsuhiko; Kawaji, Jun; Suzuki, Shuichi; Murase, Makoto; Takamori, Yoshiyuki; Asano, Naoki; Tadanaga, Kiyoharu

doi:10.1016/j.ssi.2015.03.038

Cited by 3 publications

(6 citation statements)

References 21 publications

(34 reference statements)

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“…In a recent study, the use of unit cells composed of nanoscale spherical particles to model the microporous layer (MPL) of polymer electrolyte membrane fuel cells was investigated (Zamel et al 2012, Onuma et al 2015. The effective thermal conductivity of various unit cells based on body-centered cubic and face-centered cubic orientations, developed for commercially available MPL materials SGL-10BB and SGL-10BC, was determined.…”

Section: Thermal Conductivity Of Proton Exchange Membrane Fuel Cellsmentioning

confidence: 99%

“…The effective thermal conductivity of various unit cells based on body-centered cubic and face-centered cubic orientations, developed for commercially available MPL materials SGL-10BB and SGL-10BC, was determined. Based on studies, unit cells are constructed using constant particle size and filling radius while varying the particle separation distance , Onuma et al 2015. Results revealed that effective thermal conductivity of the MPL mainly depends on the particle spacing due to high thermal conductivity of the carbon particles.…”

Section: Thermal Conductivity Of Proton Exchange Membrane Fuel Cellsmentioning

confidence: 99%

“…The needed power performance output of proton exchange membrane fuel cells for special applications is attained through the stacking of single cells or membrane electrode assemblies, individually separated by a bipolar plate (BPP) Bazylak 2015, Sadeghifar et al 2015). The necessary heat and related water control of fuel cells requires knowledge of the heat bulk and interfacial contact resistances of all components involved (Liao et al 2008, Onuma et al 2015. A recent study reported measurement of heat dissipation of a graphite BPP relative to temperature and its thermal contact resistance (TCR) with treated and untreated gas diffusion layers (GDLs) .…”

Section: Thermal Conductivity Of Proton Exchange Membrane Fuel Cellsmentioning

confidence: 99%

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Recently emerging trends in thermal conductivity of polymer nanocomposites

Idumah

Hassan²

2016

Reviews in Chemical Engineering

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Due to escalating power densities in electronics, information, communication, energy storage, aerospace, and automobile technologies, heat dissipation has become immensely essential for the efficient performance and reliability of photonic, electronics, optoelectronics, and other devices in order to proactively prevent premature failure due to overheating. The functionalization and synergistic inclusion of thermally conducting nanoparticles such as carbon derivatives and metallic and ceramic fillers into polymer matrices have resulted in development of thermally conducting polymer nanocomposites. This has enlarged the scope of application of these materials in areas hitherto restricted due to poor thermal conductivity and, therefore, opened broad windows of opportunities for polymer nanocomposites as emerging alternative replacements for metal components in various applications where effective heat dissipation is compulsory for device performance. Thus, this paper critically discusses globally emerging technologies applied in the development of thermally conductive polymer nanocomposites for various industrial applications.

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Section: Thermal Conductivity Of Proton Exchange Membrane Fuel Cellsmentioning

confidence: 99%

Section: Thermal Conductivity Of Proton Exchange Membrane Fuel Cellsmentioning

confidence: 99%

Section: Thermal Conductivity Of Proton Exchange Membrane Fuel Cellsmentioning

confidence: 99%

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Recently emerging trends in thermal conductivity of polymer nanocomposites

Idumah

Hassan²

2016

Reviews in Chemical Engineering

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“…The adsorption of UO 2 2+ by LIG/HTO-100 can be attributed to (1) excellent proton transport capability of 3D porous graphene; (2) polyhydroxyl groups at the active site of the C and Ti atoms possessed chemical reaction of hydrolysis polymerization with UO 2 2+ ; − (3) applied voltage reduced Ti 4+ to Ti 3+ , while also oxidizing to produce O 2 – , which reacted with UO 2 2+ to form UO 4 ·4H 2 O. In addition, the addition of hydrated titanium oxide enhanced the proton conductivity of LIG and increased the adsorption efficiency of UO 2 2+ …”

Section: Resultsmentioning

confidence: 99%

“…After electroadsorption, two new peaks occurred at 457.5 and 463.2 eV, which were considered to be Ti 3+ (2p 3/2 ) and Ti 3+ (2p 1/2 ), 38 the applied voltage resulted in a small amount of reduction from Ti 4+ to Ti 3+ , accompanied . 44 From the above analysis, a reasonable electroadsorption model of composite LIG/HTO-100 composite was drawn, as shown in Figure 7. At the beginning of electroadsorption, positively charged UO 2 2+ was adsorbed on the LIG/HTO-100 electrode material under the action of electric field force, and the EDL was formed on the electrode surface due to the porous structure of LIG, which possessed considerable transmission and storage capacity since the three-dimensional porous LIG provided many suitable active sites; thus, the adsorbed UO 2 2+ combined with the active sites to form U(VI) compounds.…”

Section: +mentioning

confidence: 98%

Hydrolyzed Hydrated Titanium Oxide on Laser-Induced Graphene as CDI Electrodes for U(VI) Adsorption

Sun,

Wang,

et al. 2023

Langmuir

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Recently, laser-induced graphene (LIG), which has been successfully applied in CDI technology (directly without a complex preparation process), has gained considerable attention. However, the raw LIG electrode with a limited number of active sites exhibits low adsorption efficiency. Therefore, the search for a suitable and effective method to modify LIG to improve its electroadsorption performance is significant. Herein, a very simple titration hydrolysis method is adopted to modify LIG, resulting in a layer of hydrated titanium oxide (HTO) being synthesized on the surface of LIG. The LIG/HTO composites possess a good adsorption property since covering the surface of LIG with a layer of HTO can greatly improve the adsorption capacity of LIG. Moreover, with the addition of HTO, not only the proton transfer ability of LIG has been enhanced but also considerable specific capacitance has been enlarged. As a result, LIG/ HTO composite as CDI electrode displays a maximum theoretical adsorption capacity of 1780.89 mg/g at 1.2 V, and the capacitance of LIG/HTO composite material is 4.74 times higher than LIG. During the electroadsorption process, Ti 4+ is reduced to Ti 3+ under external voltage, and O 2 − is produced through oxidation. Meanwhile, part of the U (VI) is hydrolyzed into UO 3 •2H 2 O under the action of −OH, and some combine with O 2 − to produce UO 4 •4H 2 O.

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Chitosan Incorporated with Titanium (IV) Oxide Membrane for Direct Methanol Fuel Cell Application

Parameswaran,

Suhaimin,

Jaafar

2024

AMST

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The direct methanol fuel cell (DMFC), a type of promoted polymer electrolyte membrane fuel cell (PEMFC), has received tremendous attention in the past two decades because of its potential as a promising technology for clean and efficient power generation in the twenty-first century. Over the past four decades, the dominancy of perfluorinated proton exchange membranes (PEM) such as Nafion is prolonging in the current PEM technology due to its chemical stability, high proton conductivity and high mechanical strength in the low operating temperatures. However, the Nafion membrane also has several weaknesses, such as high methanol permeability, high manufacturing cost, and dehydration with low proton conductivity at elevated temperatures > 100°C. This study fabricated a novel composite membrane by blending the pristine chitosan (CS) and titanium oxide (TiO2) at various loadings, 0.5, 1.0, 1.5 and 2.0 wt% to obtain high performance in DMFC. SEM and FTIR analysis showed that the grafting of (O-Ti-O) successfully incorporated into the CS polymer matrix. Water and methanol uptake of CS/TiO2 composite membrane decreased with increase of TiO2 loadings, but proton conductivity value increased. The CS/TiO2 membrane with 1.5wt.%TiO2 loading exhibited highest proton conductivity (0.41mScm-1) and lowest methanol permeability (17.18E-08cm2/s) characteristics among other membranes this due to the hydrophilic TiO2 raised the membrane hydrophilic character by increasing the number of hydrophilic sites, such as OH-, COO- and O-. The results obtained from the study can be used to conclude that chitosan membrane with TiO2 filler is a promising high performance PEM candidate for DMFC applications.

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Effect of the addition of hydrated titanium oxide on proton conductivity for aromatic polymer electrolyte membrane

Cited by 3 publications

References 21 publications

Recently emerging trends in thermal conductivity of polymer nanocomposites

Recently emerging trends in thermal conductivity of polymer nanocomposites

Hydrolyzed Hydrated Titanium Oxide on Laser-Induced Graphene as CDI Electrodes for U(VI) Adsorption

Chitosan Incorporated with Titanium (IV) Oxide Membrane for Direct Methanol Fuel Cell Application

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