Results 261 to 270 of about 3,400,569 (307)

Advances in ionogels for proton-exchange membranes

Science of The Total Environment
To ensure the long-term performance of proton-exchange membrane fuel cells (PEMFCs), proton-exchange membranes (PEMs) have stringent requirements at high temperatures and humidities, as they may lose proton carriers. This issue poses a serious challenge to maintaining their proton conductivity and mechanical performance throughout their service life ...
Yilin, Zhou, Bei, Wang, Zhiwei, Ling, Qingting, Liu, Xudong, Fu, Yanhua, Zhang, Rong, Zhang, Shengfei, Hu, Feng, Zhao, Xiao, Li, Xujin, Bao, Jun, Yang   +11 more
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Synthesis and Characterization of Polyurethanic Proton Exchange Membranes

Journal of Fuel Cell Science and Technology, 2011
Novel proton exchange membranes have been prepared by in synthesis functionalization of a polyurethane matrix with a sulfonic group containing chain terminals. The synthesis procedure was based on the use of two polyethylene glycols with nominal molecular weight of 300 and 1 k and 4,4′ dicyclohexylmethane diisocyanate in presence of the sodium salt of ...
BOTTINO, ALDO, CAPANNELLI, GUSTAVO, COMITE, ANTONIO, COSTA, CAMILLA   +3 more
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A comparison of alkaline and proton exchange membrane electrolyzers

Russian Journal of Physical Chemistry A, 2008
Faraday efficiencies and energy consumptions of a small commercial proton exchange membrane (PEM) and an alkaline electrolyzer designed at our laboratory and equipped with different cathode materials were determined. Our experimental data indicate that the alkaline electrolyzer has a higher Faraday efficiency than the PEM electrolyzer, but, on the ...
Stojić, Dragica Lj., Grozdić, Tomislav D., Umićević, Ana, Maksić, Aleksandar   +3 more
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Proton Exchange Membranes

2009
Operation and Alternative Proton Conductors 166 3.4 Future Directions 170 References 171Proton exchange membranes (PEMs) are a key component in PEM fuel cells (PEMFCs) and an area of active research in commercial, government, and academic institutions. In this chapter, the review of PEM materials is divided into two sections.
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Stereochemistry-Dependent Proton Conduction in Proton Exchange Membrane Fuel Cells

Langmuir, 2015
No description ...
RaviKumar T, Devendrachari MC, Kottaichamy AR, Tiwari O, Gaikwad P, Paswan B, Thotiyl MO   +6 more
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Proton Transfer in Proton Exchange Membrane Based on RDF

Advanced Materials Research, 2011
PEM fuel cell is the most promising application as an automotive power. Proton transfer in PEM is one of important factors to understand the performance of PEM fuel cell. In this paper, the proton transfer mechanisms are analyzed by the molecular simulation based on the basic principle of molecular dynamics.
Zhe Sun, Hong Sun, Yu Lan Tang, Jia Ji Zuo, Yu Hou Wu   +4 more
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Mesoscale Simulation of Proton Transport in Proton Exchange Membranes

The Journal of Physical Chemistry C, 2012
Previous efforts to model proton transport through fuel cell membranes have largely focused on disparate length scales: molecular dynamics at the atomistic level and fuel cell stack engineering app...
Ryan Jorn, Gregory A. Voth
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Mechanical degradation of proton exchange membrane along the MEA frame in proton exchange membrane fuel cells

Energy, 2018
Abstract Mechanical degradation, caused by local stress concentration and variation, significantly affects the lifetime of proton exchange membrane fuel cells. This study constitutes the first numerical investigation of stress evolution in the membrane between the frame of the membrane exchange assembly (MEA) and gas diffusion layer (GDL) throughout ...
Diankai Qiu, Linfa Peng, Peng Liang, Peiyun Yi, Xinmin Lai   +4 more
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Proton Exchange Membrane Nanocomposites

2010
Organic-inorganic nanocomposite proton conducting membranes have been an important thrust in the search for novel materials that outperform the state-of-the-art all-polymer membranes in fuel cells. Nanocomposite proton exchange membranes may provide routes to increased conductivity at low relative humidity, decreased methanol permeability without a ...
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Proton exchange membrane fuel cells

Vacuum, 2006
The desire to have compact, high power sources with low environmental impact has focused attention on proton exchange membrane fuel cells (PEMFC). The paper gives a brief overview of processes and technical challenges related to PEMFCs. The main goal is also to give a short overview of the underlying science and to show a feasible approach to ...
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