An ultra-stable hafnium phosphonate MOF platform for comparing the proton conductivity of various guest molecules/ions

2021 ◽  
Author(s):  
Yan Huang ◽  
Fan Zhou ◽  
Jianshen Feng ◽  
Hongxia Zhao ◽  
Chao Qi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Proton Conductivity ◽  
Guest Molecules ◽  
Test Loading ◽  
Excellent Chemical

An ultra-stable PHOS-100(Hf) is reported as an ideal MOF platform for proton conductivity test loading with various guest molecules/ions, as it has excellent chemical and thermal stability.

A Study of the Nitrogen-Containing Heterocycles on Copolyimide Properties for Proton Exchange Membranes

2013 ◽  
Vol 401-403 ◽  
pp. 563-566 ◽  
Author(s):  
Yu Han Li ◽  
Wei Jian Wang ◽  
Yu Fei Chen ◽  
Lei Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Proton Conductivity ◽  
Water Uptake ◽  
Main Chain ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Membrane Properties ◽  
Dimensional Changes ◽  
Sulfonated Polyimide

Containing pyrimidine and pyridine monomers were incorporated respectively into the main chain of a sulfonated polyimide in order to investigate the effect of nitrogen-containing heterocycles on membrane properties such as water uptake and proton conductivity. With increasing content of the nitrogen-containing heterocycles, water uptake of membranes and dimensional changes remarkable decrease. The copolymer showed higher thermal stability (desulfonation temperature up to 330 °C) and reasonable good mechanical properties. These membranes also showed higher proton conductivity, which was comparable or even higher than Nafion 117.

scholarly journals Self-catalyst β-Ga2O3 semiconductor lateral nanowire networks synthesis on the insulating substrate for deep ultraviolet photodetectors

RSC Advances ◽  
2021 ◽  
Vol 11 (45) ◽  
pp. 28326-28331
Author(s):  
Yutong Wu ◽  
Shuanglong Feng ◽  
Miaomiao Zhang ◽  
Shuai Kang ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Gallium Oxide ◽  
Wide Bandgap ◽  
Radiation Wavelength ◽  
Wide Bandgap Semiconductor ◽  
Ideal Candidate ◽  
Deep Ultraviolet ◽  
Nanowire Networks ◽  
Ultraviolet Photodetectors ◽  
Excellent Chemical

Monoclinic gallium oxide (β-Ga2O3) is a super-wide bandgap semiconductor with excellent chemical and thermal stability, which is an ideal candidate for detecting deep ultraviolet (DUV) radiation (wavelength from 200 nm to 280 nm).

Nafion – Azole Composite Membranes for High Temperature PEMFC

2014 ◽  
Vol 783-786 ◽  
pp. 1692-1697
Author(s):  
Je Deok Kim ◽  
Mun Suk Jun
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Temperature ◽  
Proton Conductivity ◽  
Composite Membrane ◽  
Room Temperature ◽  
Composite Membranes ◽  
Thermal And Mechanical Properties ◽  
High Proton Conductivity ◽  
High Proton

Nafion-azole (benzimidazole, 1,2,4-triazole, 1,2,3-triazole) composite membranes were prepared by room temperature and autoclave solution processing for high temperature (above 100 °C) PEMFC. Among the various Nafion – azole composite membranes, Nafion – 1,2,3-triazole membrane showed excellent flexibility, thermal stability, and homogeneous structure. Nafion – 1,2,4-triazole composite membrane had high thermal and mechanical properties, and also showed high proton conductivity of 0.02 S/cm at the temperature of 160 °C under dry (N2) condition.

Synthesis and Characterization of Nafion-ZrOH-CaO Hybrid Membrane for Proton Exchange Membrane Fuel Cell

2014 ◽  
Vol 11 (3) ◽  
Author(s):  
Vahid Mazinani ◽  
SeyedHadi Tabaian ◽  
Milad Rezaei ◽  
Mahdiyeh Mallahi ◽  
Mohsen Mohammadijoo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Proton Conductivity ◽  
Proton Exchange Membrane ◽  
Direct Methanol Fuel Cells ◽  
Proton Exchange ◽  
Methanol Crossover ◽  
Exchange Method ◽  
Direct Methanol ◽  
Exchange Membrane

Nafion-CaO, Nafion-ZrOH, and Nafion-CaO-ZrOH membranes are fabricated in order to improve proton conductivity, thermal stability, and mechanical properties as well as decrease methanol crossover in direct methanol fuel cells. The ion exchange method is utilized to incorporate Ca and Zr into Nafion membranes. Prepared membranes are characterized by using absorption transmission reflectance (ATR) and energy dispersive X-ray spectroscopy (EDS) techniques. Methanol crossover decreases significantly for all fabricated membranes. Nafion-CaO and Nafion-CaO-ZrOH membranes exhibit a 10 and 6 time increase in proton conductivity compared to Nafion (0.08 Scm–1), while the proton conductivity of Nafion-ZrOH decreases. The elastic modulus enhance from 48 MPa for Nafion to 60, 78, and 90 MPa for Nafion-CaO, Nafion-ZrOH, and Nafion-CaO-ZrOH membranes. In addition, the thermal stability of Nafion (360 °C) increases to 407, 457, and 470 °C for fabricated membranes.

Electrospun Polymer Composite Membrane with Superior Thermal Stability and Excellent Chemical Resistance for High-Efficiency PM2.5 Capture

2019 ◽  
Vol 11 (46) ◽  
pp. 43188-43199 ◽  
Author(s):  
Xue Yang ◽  
Yi Pu ◽  
Shuxia Li ◽  
Xiaofang Liu ◽  
Zheshan Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Polymer Composite ◽  
Composite Membrane ◽  
High Efficiency ◽  
Chemical Resistance ◽  
Excellent Chemical

Investigation of the role of benzimidazole-based model compounds on thermal stability and anhydrous proton conductivity of sulfonated poly(ether ether ketone)

2009 ◽  
Vol 180 (9-10) ◽  
pp. 738-745 ◽  
Author(s):  
Puripong Totsatitpaisan ◽  
Suzana P. Nunes ◽  
Kohji Tashiro ◽  
Suwabun Chirachanchai
Keyword(s):  
Thermal Stability ◽  
Proton Conductivity ◽  
Model Compounds ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Sulfonated Poly

Guest dependent dielectric properties of nickel(ii)-based supramolecular networks

CrystEngComm ◽  
2014 ◽  
Vol 16 (28) ◽  
pp. 6309-6315 ◽  
Author(s):  
Shruti Mendiratta ◽  
Muhammad Usman ◽  
Tzuoo-Tsair Luo ◽  
Shang-Fan Lee ◽  
Ying-Chih Lin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Dielectric Properties ◽  
High Thermal Stability ◽  
Dielectric Behaviour ◽  
Supramolecular Compounds ◽  
Guest Molecules ◽  
Supramolecular Networks ◽  
Selection Of

Nickel-based supramolecular compounds exhibit interesting guest dependent dielectric behaviour and high thermal stability. This study serves as a motivation to expand our research to create both high and low-κmaterials with a judicious selection of guest molecules.

Proton conductivity as a function of the metal center in porphyrinylphosphonate-based MOFs

2021 ◽  
Author(s):  
Yulia Yu. Enakieva ◽  
Ekaterina A. Zhigileva ◽  
Andrew N. Fitch ◽  
Vladimir V. Chernyshev ◽  
Irina A. Stenina ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Proton Conductivity ◽  
Metal Center ◽  
High Proton Conductivity ◽  
High Proton

New porphyrinylphosphonate MOFs possessing high proton conductivity (up to 10−2 S cm−1) together with superior chemical and thermal stability are described.

Enhancement in Proton Conductivity and Thermal Stability in Nafion Membranes Induced by Incorporation of Sulfonated Carbon Nanotubes

2018 ◽  
Vol 10 (16) ◽  
pp. 14026-14035 ◽  
Author(s):  
Chongshan Yin ◽  
Jingjing Li ◽  
Yawei Zhou ◽  
Haining Zhang ◽  
Pengfei Fang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Proton Conductivity ◽  
Nafion Membranes
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