In Situ Aliovalent Nickle Substitution and Acidic Modification of Nanowalls Promoted Proton Conductivity in InOF with 1D Helical Channel

2021 ◽  
Author(s):  
Hui Gao ◽  
Yan-Bin He ◽  
Juan-Juan Hou ◽  
Xian-Ming Zhang
Keyword(s):  
Proton Conductivity ◽  
Helical Channel

scholarly journals Correlated interfacial water transport and proton conductivity in perfluorosulfonic acid membranes

2019 ◽  
Vol 116 (18) ◽  
pp. 8715-8720 ◽  
Author(s):  
Xiao Ling ◽  
Mischa Bonn ◽  
Katrin F. Domke ◽  
Sapun H. Parekh
Keyword(s):  
Water Transport ◽  
Proton Conductivity ◽  
Proton Exchange ◽  
Interfacial Water ◽  
Total Water ◽  
Perfluorosulfonic Acid ◽  
Water Diffusivity ◽  
Perfluorosulfonic Acid Membranes ◽  
Coherent Raman

Water must be effectively transported and is also essential for maximizing proton conductivity within fuel-cell proton-exchange membranes (PEMs). Therefore, identifying relationships between PEM properties, water transport, and proton conductivity is essential for designing optimal PEMs. Here, we use coherent Raman spectroscopy to quantify real-time, in situ diffusivities of water subspecies, bulk-like and nonbulk-like (interfacial) water, in five different perfluorosulfonic acid (PFSA) PEMs. Although the PEMs were chemically diverse, water transport within them followed the same rule: Total water diffusivity could be represented by a linear combination of the bulk-like and interfacial water diffusivities. Moreover, the diffusivity of interfacial water was consistently larger than that of bulk-like water. These measurements of microscopic transport were combined with through-plane proton conductivity measurements to reveal the correlation between interfacial water transport and proton conductivity. Our results demonstrate the importance of maximizing the diffusivity and fractional contribution of interfacial water to maximize the proton conductivity in PFSA PEMs.

In situ studies of structural stability and proton conductivity of titanate nanotubes

2009 ◽  
Vol 2 (5) ◽  
pp. 517 ◽  
Author(s):  
Tao Gao ◽  
Harald Fjeld ◽  
Helmer Fjellvåg ◽  
Truls Norby ◽  
Poul Norby
Keyword(s):  
Proton Conductivity ◽  
Structural Stability ◽  
Titanate Nanotubes ◽  
In Situ Studies

scholarly journals Nafion-Peptized Laponite Clay Nanocomposite Membrane for PEMFC

2011 ◽  
Vol 410 ◽  
pp. 148-151
Author(s):  
Ananta Kumar Mishra ◽  
Seon Hyeong Bae ◽  
Nam Hoon Kim ◽  
Kin Tak Lau ◽  
Joong Hee Lee
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Polymer Electrolyte Membrane ◽  
Nanocomposite Membrane ◽  
Acid Activation ◽  
Electrolyte Membrane ◽  
Technical Properties ◽  
Acid Activated Clay ◽  
Hydrolysis Of

Nafion-clay nanocomposite membrane has been prepared by dispersing unmodified and acid activated Laponite XLS in Nafion 20% dispersion. The resulting membranes possess better proton conductivity and mechanical strength as compared to the virgin membrane. Acid activation of the nanoclay leads to thein-situgeneration of H3PO4by the hydrolysis of the peptizer present on the surface of the nanoclay. Thein-situgenerated H3PO4helps in improving all the technical properties of the nanocomposite including the water uptake and proton conductivity of the nanocomposite, containing acid activated clay compared to the nanocomposite, containing unmodified clay. The maximum proton conductivity of 270.2 mS/cm is achieved at 110 °C for the nanocomposite membrane containing 3% acid-activated Laponite compared to 136.2 mS/cm for the virgin Nafion. Keywords: Nafion, clay, nanocomposite, peptizer, polymer electrolyte membrane fuel cell (FEMFC), proton conductivity, membrane

scholarly journals A direct in situ observation of water-enhanced proton conductivity of Eu-doped ZrO2: Effect on WGS reaction

2018 ◽  
Vol 231 ◽  
pp. 343-356 ◽  
Author(s):  
Nuria García-Moncada ◽  
Luis F. Bobadilla ◽  
Rosalía Poyato ◽  
Carlos López-Cartes ◽  
Francisca Romero-Sarria ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
In Situ Observation ◽  
Wgs Reaction

Water stable oxalate-based coordination polymers with in situ generated cyclic dipeptides showing high proton conductivity

2018 ◽  
Vol 47 (43) ◽  
pp. 15288-15292 ◽  
Author(s):  
Jingyu Shi ◽  
Jing Li ◽  
Hongmei Zeng ◽  
Guohong Zou ◽  
Qinghua Zhang ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Proton Conductivity ◽  
Coordination Polymers ◽  
High Proton Conductivity ◽  
Cyclic Dipeptides ◽  
High Proton

Presented here are two water stable oxalate-based coordination polymers with in situ generated cyclic dipeptides, which show high proton conductivities on the order of 10−3 S cm−1 at 85 °C under 98% relative humidity.

The Influence on Proton Conductivity and Methanol Permeability of SiO2/PVA-PAMPS Composite Membrane

2012 ◽  
Vol 503-504 ◽  
pp. 625-628 ◽  
Author(s):  
Chun Hua Yuan ◽  
Gui Bao Guo ◽  
Sheng Li An
Keyword(s):  
Proton Conductivity ◽  
High Selectivity ◽  
Direct Methanol Fuel Cells ◽  
Sol Gel ◽  
Methanol Permeability ◽  
Electrolyte Membrane ◽  
Direct Methanol ◽  
Order Of Magnitude ◽  
Sol Gel Synthesis

Polyvinyl alcohol(PVA) modified by SiO2/poly 2-acrylamido 2-methylpropane sulfonic acid (PAMPS) electrolyte membrane (SiO2/PVA-PAMPS ) was prepared by a Sol-gel synthesis in situ technique for DMFC. The influence of the different ratio of AMPS and SiCl4 on the proton conductivity and methanol permeability of these membranes was studied using an impedance analyzer and a gas chromatograph. The results showed that with increasing of the content of silicon dioxide, the SiO2 was homogeneously distributed in the membrane. As the AMPS content increased, the proton conductivity of the SiO2/PVA-PAMPS membranes also increased. The swelling degree of the SiO2/PVA-PAMPS membrane with 30wt% SiCl4 and 20wt% AMPS was 28.79% at 25°C. The membranes possess a methanol permeability of around 10-7 cm2•S-1, which is about one order of magnitude lower than that of Nafion115. These membranes have high selectivity and are promising for use in direct methanol fuel cells (DMFC).

Enhanced proton conductivity of La0.95Ca0.05NixNb1-xO4 (0.01 ≤ x ≤ 0.3) through in-situ exsolution of metallic nanocatalysts

2018 ◽  
Vol 208 ◽  
pp. 226-236 ◽  
Author(s):  
Mingming Li ◽  
Tao Hong ◽  
Jigui Cheng ◽  
Zhenhao Chen ◽  
Chenxi Xu
Keyword(s):  
Proton Conductivity

scholarly journals Infrared dynamics study of thermally treated perfluoroimide acid proton exchange membranes

2017 ◽  
Vol 19 (1) ◽  
pp. 626-635 ◽  
Author(s):  
L. Puskar ◽  
E. Ritter ◽  
U. Schade ◽  
M. Yandrasits ◽  
S. J. Hamrock ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Acid Proton ◽  
Water Hydrogen ◽  
Thermally Treated ◽  
Hydrogen Bonded

In situinfrared investigation of the water hydrogen-bonded network inside PFIA accounts for improved proton conductivity under hotter and dryer conditions.

Incorporating phosphoric acid-functionalized polydopamine into Nafion polymer by in situ sol-gel method for enhanced proton conductivity

2019 ◽  
Vol 570-571 ◽  
pp. 236-244 ◽  
Author(s):  
Hongxiu Zhang ◽  
Qitu Hu ◽  
Xiuwen Zheng ◽  
Yongheng Yin ◽  
Hong Wu ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method
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