Preparation and conductivity of organic-undecatungstochromoindic heteropoly acid hybrid materials

Zhao, Shouli; Wu, Qingyin; Liu, Zhiwei

doi:10.1007/s00289-005-0469-z

Cited by 10 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the proton conductivity of SP-6 membrane with 6 wt % s-BN is lower than SP-5 membrane (5 wt % s-BN), and this relates to aggregation of additive within the polymer matrix. , As seen from Figure , proton conductivity increases with an increase in temperature due to enhanced ion mobility wherein vehicular mechanism is predominant as water molecules are carrier for ion transport; protons diffuse through the media in the form of H 3 O + , H 5 O 2 + , and H 9 O 4 + ions in relation to temperature. On the other hand, the Grotthuss mechanism involves stationary water molecules for proton transport by ion hopping from one water molecule to another along with hydrogen-bonded ionic channels . The high conductivity of composite membranes under stringent test conditions is ascribed to the adequate connectivity between sPPO and s-BN which facilitates Grotthuss type proton transport. , The activation energy for proton conduction is determined by measuring proton conductivity for pristine sPPO and composite membranes as a function of temperature and is presented in Table .…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the Grotthuss mechanism involves stationary water molecules for proton transport by ion hopping from one water molecule to another along with hydrogen-bonded ionic channels. 68 The high conductivity of composite membranes under stringent test conditions is ascribed to the adequate connectivity between sPPO and s-BN which facilitates Grotthuss type proton transport. 69,70 The activation energy for proton conduction is determined by measuring proton conductivity for pristine sPPO and composite membranes as a function of temperature and is presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Insight toward the Electrochemical Properties of Sulfonated Poly(2,6-dimethyl-1,4-phenylene oxide) via Impregnating Functionalized Boron Nitride: Alternate Composite Polymer Electrolyte for Direct Methanol Fuel Cell

Yadav

Niluroutu

Bhat

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

A series of polymer electrolytes of sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (sPPO) in combination with two-dimensional sulfonated boron nitride (s-BN) has been synthesized to form composite polymer electrolytes for direct methanol fuel cell (DMFC). The sulfonation of boron nitride (BN) has been confirmed by XPS, FT-IR, and elemental analysis. The composite membranes have been characterized for their water content, ion transport phenomenon, and thermo-mechanical stabilities along with methanol crossover resistance. Further, s-BN shows good dispersion in sPPO composite membranes by forming amplified longrange ionic clusters via hydrophilic or hydrogen bonding interaction between the s-BN and sPPO matrix. The optimized s-BN/sPPO (5 wt %) composite membrane reveals 67% higher proton conductivity and one-third methanol permeability compared to pristine sPPO membrane. The s-BN/sPPO (5 wt %) composite membrane presents a DMFC peak power density of 122 mW/cm 2 , which is higher than the peak power densities of 88 and 60 mW/cm 2 for Nafion 117 and pristine sPPO, respectively. The preferential increase in electrochemical selectivity of composite membranes suggests their potential in DMFCs.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Insight toward the Electrochemical Properties of Sulfonated Poly(2,6-dimethyl-1,4-phenylene oxide) via Impregnating Functionalized Boron Nitride: Alternate Composite Polymer Electrolyte for Direct Methanol Fuel Cell

Yadav

Niluroutu

Bhat

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…In the vehicular mechanism, water molecules act as vehicles by carrying along protons that are attached to them in such forms as H 3 O + , H 5 O 2 + , H 9 O 4 + while diffusing through the aqueous media. Meanwhile, the Grotthus mechanism involves stationary water molecules, with protons hopping from one water molecule to another to be transported along hydrogen bonded ionic channels 40, 41. That is, the more water that exists in the membrane, the more hydrated species are generated, thus, the more protons are transported.…”

Section: Results and Conclusionmentioning

confidence: 99%

Low methanol permeable sulfonated poly(ether imide)/sulfonated multiwalled carbon nanotube membrane for direct methanol fuel cell

Heo

Yun

et al. 2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

A novel organic/inorganic composite membrane synthesized with sulfonated multiwalled carbon nanotubes (s-MWNTs) and sulfonated polyetherimide (s-PEI) is prepared for use in a direct methanol fuel cell (DMFC). A solution casting method was used to prepare s-MWNT/s-PEI membranes (SPEI membranes) with various s-MWNT contents. This composite membrane showed not only low methanol crossover and water swelling but also enhanced mechanical properties. The IEC and proton conductivity of SPEI membranes were increased by incrementing their s-MWNT content. This is because the number of sulfonic acid groups (SO 3 À ) increases as s-MWNTs are added. The water uptake of SPEI membranes increased as s-MWNT content was increased due to the hydrogen bonded interaction between sulfonic groups and carboxylic groups in s-MWNTs and water molecules. However, the water uptake of SPEI membranes is remarkably low, compared with Nafion membranes. The methanol permeability of the SPEI membranes (8.8 Â 10 À8 cm 2 s À1 ) in this study was also lower than that of the Nafion membrane. Therefore, SPEI membranes were expected to have potential applications in DMFCs. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E467-E477, 2012

show abstract

“…Another reason is that the carbonyl group of s‐MWNTs also forms a hydrogen bond with water molecules. The additional water molecules are preferentially associated with previously absorbed water molecules, which are the hydrogen bonded water molecules 41…”

Section: Resultsmentioning

confidence: 99%

Sulfonated multiwalled carbon nanotube/sulfonated poly(ether sulfone) composite membrane with low methanol permeability for direct methanol fuel cells

Yun

Heo

et al. 2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

An organic/inorganic composite membrane was prepared based on sulfonated poly(ether sulfone) (s-PES) embedded with sulfonated multiwalled carbon nanotubes (s-MWNTs). The ion exchange capacity (IEC), proton conductivity, and water uptake of the SPES membranes increased with increasing s-MWNTs content. The increased water uptake was attributed to hydrogen bond formation between the carbonyl group of the s-MWNTs and a water molecule. The composite membranes exhib-ited proton conductivities ranging from 3.9281 Â 10 À4 to 7.0788 Â 10 À3 S/cm at 80 C, as well as low methanol permeability ranging from 4.4405 Â 10 À10 to 9.1008 Â 10 À10 cm 2 s À1 at 25 C. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E513-E521, 2012

show abstract

Preparation and conductivity of organic-undecatungstochromoindic heteropoly acid hybrid materials

Cited by 10 publications

References 17 publications

Insight toward the Electrochemical Properties of Sulfonated Poly(2,6-dimethyl-1,4-phenylene oxide) via Impregnating Functionalized Boron Nitride: Alternate Composite Polymer Electrolyte for Direct Methanol Fuel Cell

Insight toward the Electrochemical Properties of Sulfonated Poly(2,6-dimethyl-1,4-phenylene oxide) via Impregnating Functionalized Boron Nitride: Alternate Composite Polymer Electrolyte for Direct Methanol Fuel Cell

Low methanol permeable sulfonated poly(ether imide)/sulfonated multiwalled carbon nanotube membrane for direct methanol fuel cell

Sulfonated multiwalled carbon nanotube/sulfonated poly(ether sulfone) composite membrane with low methanol permeability for direct methanol fuel cells

Contact Info

Product

Resources

About