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.

Ground to conduct: mechanochemical synthesis of a metal–organic framework with high proton conductivity

2015 ◽  
Vol 51 (36) ◽  
pp. 7637-7640 ◽  
Author(s):  
Dariusz Matoga ◽  
Marcin Oszajca ◽  
Marcin Molenda
Keyword(s):  
Proton Conductivity ◽  
Mechanochemical Synthesis ◽  
Metal Organic Framework ◽  
Environmentally Friendly ◽  
High Proton Conductivity ◽  
Proton Conducting ◽  
High Proton ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

A high proton-conducting metal–organic framework (PCMOF) is prepared for the first time by economical and environmentally-friendly mechanochemistry.

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.

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.

Nanostructured proton-conducting membranes based on polymerizable zwitterionic ionic liquid microemulsions

2016 ◽  
Vol 40 (9) ◽  
pp. 7580-7586 ◽  
Author(s):  
Fei Lu ◽  
Xinpei Gao ◽  
Panpan Sun ◽  
Liqiang Zheng
Keyword(s):  
Ionic Liquid ◽  
Proton Conductors ◽  
Proton Conducting ◽  
First Time ◽  
Conducting Membranes

Polymerizable zwitterionic ionic liquid microemulsions were fabricated for the first time to prepare ionic liquid based proton-conductors.

scholarly journals Polyoxometalate–Polymer Hybrid Materials as Proton Exchange Membranes for Fuel Cell Applications

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3425 ◽  
Author(s):  
Zhai ◽  
Li
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Hybrid Materials ◽  
Clean Energy ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
High Proton Conductivity ◽  
Proton Conducting ◽  
Polymer Hybrid ◽  
High Proton

As one of the most efficient pathways to provide clean energy, fuel cells have attracted great attention in both academic and industrial communities. Proton exchange membranes (PEMs) or proton-conducting electrolytes are the key components in fuel cell devices, which require the characteristics of high proton conductivity as well as high mechanical, chemical and thermal stabilities. Organic–inorganic hybrid PEMs can provide a fantastic platform to combine both advantages of two components to meet these demands. Due to their extremely high proton conductivity, good thermal stability and chemical adjustability, polyoxometalates (POMs) are regarded as promising building blocks for hybrid PEMs. In this review, we summarize a number of research works on the progress of POM–polymer hybrid materials and related applications in PEMs. Firstly, a brief background of POMs and their proton-conducting properties are introduced; then, the hybridization strategies of POMs with polymer moieties are discussed from the aspects of both noncovalent and covalent concepts; and finally, we focus on the performance of these hybrid materials in PEMs, especially the advances in the last five years. This review will provide a better understanding of the challenges and perspectives of POM–polymer hybrid PEMs for future fuel cell applications.

scholarly journals High proton conductivity of NaMg1-xLixHx(PO3)3 ·yH2O with the three-dimensional open framework in the intermediate temperature

2021 ◽  
Author(s):  
Naoya Ueda ◽  
Jun Nakajima ◽  
Daisuke Mori ◽  
Sou Taminato ◽  
Nobuyuki Imanishi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Fuel Cells ◽  
Proton Conductivity ◽  
Solid Electrolytes ◽  
Three Dimensional ◽  
Intermediate Temperature ◽  
High Proton Conductivity ◽  
Open Framework ◽  
High Proton ◽  
Wide Range

Proton solid electrolytes, which exhibit high proton conductivity and thermal stability at a wide range of intermediate temperatures, are desirable for operating fuel cells at a temperature suitable for applications...

scholarly journals Applicability of Gd-doped BaZrO3, SrZrO3, BaCeO3 and SrCeO3 proton conducting perovskites as electrolytes for solid oxide fuel cells

2013 ◽  
Vol 11 (4) ◽  
pp. 471-484 ◽  
Author(s):  
Wojciech Zając ◽  
Dariusz Rusinek ◽  
Kun Zheng ◽  
Janina Molenda
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Proton Conductivity ◽  
Solid Oxide ◽  
Limiting Factor ◽  
Oxide Fuel ◽  
Proton Conducting ◽  
Proton Diffusion ◽  
Sorption Ability

AbstractFour proton conducting oxides of perovskite structure: BaZrO3, SrZrO3, BaCeO3 and SrCeO3 doped with 5 mol.% of gadolinium are compared in terms of crystal structure, microstructure, sinterability, water sorption ability, ionic transference number, electrical conductivity and stability towards CO2. Relations between proton conductivity, structural and chemical parameters: pseudo-cubic unit cell volume, lattice free volume, tolerance factor, crystal symmetry and electronegativity are discussed. The grain boundary resistance is shown to be the limiting factor of total proton-conductivity for the materials examined. The highest proton conductivity was observed for BaCeO3, however, it turned out to be prone to degradation in CO2-containing atmosphere and reduction at high temperatures. On the other hand, Ba and Sr zirconates are found to be more chemically stable, but exhibit low electrical conductivity. Electrical conductivity relaxation upon hydration is used to calculate proton diffusion coefficient. Selected materials were tested as electrolytes in solid oxide fuel cells.

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