Simultaneously enhanced methanol barrier and proton conductive properties of phosphorylated titanate nanotubes embedded nanocomposite membranes

Wang, Jingtao; Zhao, Yang; Hou, Weiqiang; Geng, Jianxin; Xiao, Lulu; Wu, Haili; Jiang, Zhongyi

doi:10.1016/j.jpowsour.2009.08.053

Cited by 42 publications

(11 citation statements)

References 47 publications

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“…However, the proton conductivity of CS/MWCNTs composite membranes is poorer than that of Nafion 117 because (1) the decrease in water uptake can result in a decrease in the proton migration and hydrogen framework, (2) the formation of transfer channels leads to an increase in the tortuosity of the proton‐conducting pathway, and (3) the inhibition of chain mobility in the CS matrix results in a reduction of transfer assistance ability of H 3 O + ions and protons . Similar results have also been reported in previous studies . Acid–base membranes are often prepared by (1) directly incorporating low‐molecular‐weight acid–base into the acidic/basic polymer membrane or (2) grafting low‐molecular‐weight acid–base onto inorganic fillers and then mixing with a basic/acidic polymer .…”

Section: Resultssupporting

confidence: 75%

Novel sulfonated multi‐walled carbon nanotubes filled chitosan composite membrane for fuel‐cell applications

Ahmed

Ali

Cai

et al. 2019

J of Applied Polymer Sci

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In the present study, multi‐walled carbon nanotubes (MWCNTs) were sulfonated by 1,3‐propane sultone and distillation–precipitation polymerization, respectively, and then incorporated into chitosan (CS) to prepare CS/MWCNTs composite membranes for fuel cell applications. CS/MWCNTs membranes show better thermal and mechanical stability than pure CS membrane due to the strong electrostatic interaction between the SO3H groups of MWCNTs and the NH2 groups of CS, which can restrict the mobility of CS chain. The sulfonated MWCNTs provide efficient proton hopping sites (SO3H, SO3− …. 3+HN), thereby resulting in the formation of continuous proton conducting channels. The composite membranes with 5 wt % of MWCNTs modified by two different ways show a proton conductivity of 0.026 and 0.025 S·cm−1, respectively. In conclusion, CS/MWCNTs membrane is a promising proton exchange membrane for fuel‐cell applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47603.

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Section: Resultssupporting

confidence: 75%

Novel sulfonated multi‐walled carbon nanotubes filled chitosan composite membrane for fuel‐cell applications

Ahmed

Ali

Cai

et al. 2019

J of Applied Polymer Sci

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“…This phenomenon is mainly originated from the presence of SSiO 2 @CNTs fillers, as observed in other carbon nanotubefilled films. [26,41] More obviously, the tubular structures can be observed clearly with higher SSiO 2 @CNTs content (as marked with red circles in Figure 5d-f), especially in Figure 5f with enlarged image. This observation further confirmed the presence of SSiO 2 @CNTs fillers, and the intact tubular morphological characteristic is maintained in the composite membranes, which is crucial for the application of unique property advantages of CNTs materials.…”

Section: Characterization Of Composite Membranesmentioning

confidence: 90%

The Construction and Application of Dual‐Modified Carbon Nanotubes in Proton Exchange Membranes with Enhanced Performances

Feng

Zhong

et al. 2021

Macro Materials & Eng

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In this study, the carbon nanotubes (CNTs) are successively coated via sol-gel method with SiO 2 (SiO 2 @CNTs), followed by grafting with 3-merraptnpropyltrimethnxysilane and oxidation with hydrogen peroxide to yield dual-modified CNTs (SSiO 2 @CNTs). The SSiO 2 @CNTs material is applied to prepared chitosan (CS) based composite proton exchange membranes by the incorporation of various content of SSiO 2 @CNTs, the structure and properties of as-prepared composite membranes are fully investigated. Compared to pristine CS membrane, the SSiO 2 @CNTs-filled composite membranes show improved thermal stability, mechanical stability, and methanol resistance, owing to the effective interface interaction and good compatibility between SSiO 2 @CNTs and CS matrix. Additionally, the doping of SSiO 2 @CNTs also generates a positive effect on the electrochemistry performance, due to the construction of abundant transport channel and providing more proton sources or proton sites. Particularly, the CS/SSiO 2 @CNTs-7 membrane exhibits tensile strength of about 40.1 MPa and proton conductivity of 35.8 mS cm −1 at 80 °C, which is almost 1.6 and 2.0 times higher than pure CS membrane, and lower methanol permeability of 0.9 × 10 −6 cm 2 s −1 . The direct methanol fuel cell performance (DMFC) of CS/SSiO 2 @CNTs-7 membrane is also improved with open circuit voltage of 0.67 V and maximum power density of 60.7 mW cm −2 at 70 °C.

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“…A number of composite membranes have been synthesized to reduce methanol crossover and improve proton conductivity for DMFCs such as inorganic–organic material , composite with organic , composite with inorganic , nanocomposite , and multilayer composite .…”

Section: Factors Affecting Methanol Crossovermentioning

confidence: 99%

“… (a) Variations of the measured proton conductivity versus methanol permeability for composite membranes. (b) Variation of selectivity (conductivity/permeability) versus proton conductivity for composite membranes from the literatures: () SPEEK/SiO 2 , () PVA/SiO 2 , () CS/(P(AA‐AMPS) , () SPS/PTFE , () DBSA‐PEG / SiO 2 , () PVA/PWA, () PVA , ( X ) CS/PTNT , () CS/STiO 2 , () CS/silica , () PI/SPES ,() CS/TNT , () sPEEK‐OMB , () PVA/SSA/sPBS , () SPEEK/ PVA , ( + ) CPV , () SPEEK/TPA/MCM‐41, () PAMPS , () PVA/ZrP/SWA , () AESA‐Na ,() SPEEK ,() SPAEK , (@) PVA/sulfated β‐cyclodextrin ( $ ) PE‐SHSBS , ( a ) SPEEK‐PEEK‐BI ,( C ) SPEEK/PVDF/PWA ,(#) CS/Beta/SO 3 H , ( & ) Nitrated SPEEK , ( ^ ) STMPEEK/TMBP/PNBS , (*) PI‐PVA‐TSGEPS , ( − ) AEMss .…”

Section: Factors Affecting Methanol Crossovermentioning

confidence: 99%

A review on methanol crossover in direct methanol fuel cells: challenges and achievements

Ahmed

Dinçer

2011

Int. J. Energy Res.

234

125

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SUMMARYDirect methanol fuel cells have the potential to power future microelectronic and portable electronic devices because of their high energy density. One of the major obstacles that currently prevent the widespread applications of direct methanol fuel cells is the methanol crossover through the polymer-electrolyte membrane. Methanol crossover is closely related to several factors including membrane structure and morphology, membrane thickness, and fuel cell operating conditions such as temperature, pressure, and methanol feed concentration. This work presents a comprehensive overview of the state-ofthe-art technology for the most important factors, affecting methanol crossover in direct methanol fuel cells. In addition, the current and future directions of the research and development activities, aiming to reduce the methanol crossover are reviewed and discussed in order to improve the performance of direct methanol fuel cells.

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Simultaneously enhanced methanol barrier and proton conductive properties of phosphorylated titanate nanotubes embedded nanocomposite membranes

Cited by 42 publications

References 47 publications

Novel sulfonated multi‐walled carbon nanotubes filled chitosan composite membrane for fuel‐cell applications

Novel sulfonated multi‐walled carbon nanotubes filled chitosan composite membrane for fuel‐cell applications

The Construction and Application of Dual‐Modified Carbon Nanotubes in Proton Exchange Membranes with Enhanced Performances

A review on methanol crossover in direct methanol fuel cells: challenges and achievements

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