Fast Proton Conductors from Inorganic-Organic Composites: I. Amorphous Phosphate-Nafion and Silicophosphate-PMA/PWA Hybrids

1999 ◽  
Vol 600 ◽  
Author(s):  
Yong-Il Park ◽  
Jae-Dong Kim ◽  
Masayuki Nagai
Keyword(s):  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Proton Conductors ◽  
Phosphorus Concentration ◽  
High Proton ◽  
Proton Source ◽  
Drastic Increase ◽  
Amorphous Phosphate ◽  
Exchange Resins ◽  
Very High

AbstractA drastic increase of electrical conductivity was observed in the composite of amorphous phosphate and ion-exchange resins (Nafion) as phosphorus concentration increased. Incorporation of amorphous phosphate into Nafion caused a large increase of conductivity to about 4×10−1S/cm at 23°C. However, the fabricated composite showed very low chemical stability.A high proton conductivity was also observed in a new inorganic-organic hybrids through incorporating PMA(molibdo-phosphoric acid)/PWA(tungsto-phosphoric acid) as a proton source in amorphous silicophosphate gel structure. Obtained gels were homogeneous and chemically stable. Resulting proton conductivity is very high (up to 5.5×10−3S/cm) compared to those of silicophosphate gels.

Fast Proton Conductors from Inorganic-Organic Composites: II. Amorphous Phosphate-PTFE and ZrP-PTFE Composites

1999 ◽  
Vol 600 ◽  
Author(s):  
Yong-Il Park ◽  
Jae-Dong Kim ◽  
Masayuki Nagai
Keyword(s):  
Heat Treatment ◽  
Proton Conductivity ◽  
Zirconium Phosphate ◽  
Treatment Temperature ◽  
Proton Conductors ◽  
Fast Proton ◽  
High Proton Conductivity ◽  
High Proton ◽  
Amorphous Phosphate ◽  
Ptfe Composites

AbstractA high proton-conductivity was observed in the composite of amorphous phosphate and polytetafluoroethylene (PTFE). Incorporation of amorphous phosphate into PTFE emulsion caused a large increase of conductivity to about 4×10−2S/cm at 23°C. However, the conductivity decreased with increasing heat-treatment temperature, and the fabricated composite showed very low chemical stability.As a chemically stable composite, PTFE-based composite was also synthesized from α- or γ-zirconium phosphate crystalline powders dispersed in partially polymerized PTFE particles. By addition of zirconium phosphate powders, the proton conductivity jumped up to 2.2×10−3S/cm from 10−13S/cm of PTFE.

Synthesis and characterization of crosslink-free highly sulfonated multi-block poly(arylene ether sulfone) multi-block membranes for fuel cells

2015 ◽  
Vol 3 (5) ◽  
pp. 1833-1836 ◽  
Author(s):  
Sojeong Lee ◽  
Jinju Ann ◽  
Hyejin Lee ◽  
Joon-Hee Kim ◽  
Chang-Soo Kim ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Proton Conductivity ◽  
Synthesis And Characterization ◽  
High Proton Conductivity ◽  
Block Polymers ◽  
Arylene Ether ◽  
High Proton ◽  
Very High

Highly sulfonated hydrophilic block polymers were designed and the resultant block membrane showed very high proton conductivity even under low RH.

scholarly journals Proton conductivity in ampullae of Lorenzini jelly

2016 ◽  
Vol 2 (5) ◽  
pp. e1600112 ◽  
Author(s):  
Erik E. Josberger ◽  
Pegah Hassanzadeh ◽  
Yingxin Deng ◽  
Joel Sohn ◽  
Michael J. Rego ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Electric Fields ◽  
Keratan Sulfate ◽  
High Proton Conductivity ◽  
Ampullae Of Lorenzini ◽  
Current State ◽  
High Proton ◽  
Proton Donors ◽  
Very High

In 1678, Stefano Lorenzini first described a network of organs of unknown function in the torpedo ray—the ampullae of Lorenzini (AoL). An individual ampulla consists of a pore on the skin that is open to the environment, a canal containing a jelly and leading to an alveolus with a series of electrosensing cells. The role of the AoL remained a mystery for almost 300 years until research demonstrated that skates, sharks, and rays detect very weak electric fields produced by a potential prey. The AoL jelly likely contributes to this electrosensing function, yet the exact details of this contribution remain unclear. We measure the proton conductivity of the AoL jelly extracted from skates and sharks. The room-temperature proton conductivity of the AoL jelly is very high at 2 ± 1 mS/cm. This conductivity is only 40-fold lower than the current state-of-the-art proton-conducting polymer Nafion, and it is the highest reported for a biological material so far. We suggest that keratan sulfate, identified previously in the AoL jelly and confirmed here, may contribute to the high proton conductivity of the AoL jelly with its sulfate groups—acid groups and proton donors. We hope that the observed high proton conductivity of the AoL jelly may contribute to future studies of the AoL function.

Novel PA-doped polybenzimidazole membranes with high doping level, high proton conductivity and high stability for HT-PEMFCs

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53870-53873 ◽  
Author(s):  
Xiaobai Li ◽  
Hongwei Ma ◽  
Hailong Wang ◽  
Shitong Zhang ◽  
Zhenhua Jiang ◽  
...  
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Doping Level ◽  
High Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
High Proton Conductivity ◽  
High Doping Level ◽  
High Proton

This work outlines polybenzimidazole-based high temperature proton exchange membranes with a high phosphoric acid-doping level, high proton conductivity and high stability.

Novel Hybrid Heteropoly Acid/Polymer Ionomers with Very High Proton Conductivity

2019 ◽  
Vol 33 (1) ◽  
pp. 839-844 ◽  
Author(s):  
James L. Horan ◽  
Mei-Chen Kuo ◽  
Zachary Ziegler ◽  
Fan Zhang ◽  
Andrew S. Perdue ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Heteropoly Acid ◽  
High Proton Conductivity ◽  
High Proton ◽  
Very High

scholarly journals Electrochemical Characterization of Novel Polyantimonic-Acid-Based Proton Conductors for Low- and Intermediate-Temperature Fuel Cells

2021 ◽  
Vol 11 (24) ◽  
pp. 11877
Author(s):  
Olga Yu. Kurapova ◽  
Pedro M. Faia ◽  
Artem A. Zaripov ◽  
Vasily V. Pazheltsev ◽  
Artem A. Glukharev ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Proton Conductivity ◽  
Pyrochlore Structure ◽  
Xrd Analysis ◽  
Proton Conductors ◽  
Hydrogen Energy ◽  
Proton Conducting ◽  
Polyantimonic Acid ◽  
High Proton ◽  
First Time

The development of novel proton-conducting membrane materials for electrochemical power units, i.e., low temperature fuel cells (FCs), efficiently working up to 300 °C, is a critical problem related to the rapid shift to hydrogen energy. Polyantimonic acid (PAA) is characterized by high conductivity, sufficient thermal stability and can be regarded as a prospective proton-conducting material. However, the fabrication of bulk PAA-based membranes with high proton conductivity remains a challenging task. In the present work, for the first time, the authors report the investigation on proton conductivity of bulk PAA-based membranes in the temperature range 25–250 °C, both in dry air and in moisturized air. Using PAA powder and fluoroplastic as a binder, fully dense cylindrical membranes were formed by cold uniaxial pressing. The structures of the PAA-based membranes were investigated by SEM, EDX, XRD and Raman techniques. STA coupled with in situ thermo-XRD analysis revealed that the obtained membranes corresponded with Sb2O5·3H2O with pyrochlore structure, and that no phase transitions took place up to 330 °C. PAA-based membranes possess a high-grain component of conductivity, 5 × 10−2 S/cm. Grain boundary conductivities of 90PAA and 80PAA membranes increase with relative humidity content and their values change non-linearly in the range 25–250 °C.

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