Results 51 to 60 of about 11,572 (205)

Recent developments, challenges, and future directions in active direct methanol fuel cells

International Journal of Electrochemical Science
Active Direct Methanol Fuel Cells (ADMFCs) have been explored with continuous interest as potentially powerful low-temperature energy conversion technology in portable and distributed power supply systems.
Ephraim Bonah Agyekum, Flavio Odoi-Yorke, Mustafa Abdullah, Arman Ameen, Seepana Praveenkumar, Farhan Lafta Rashid   +5 more
doaj   +1 more source

Performance Analysis of Direct Methanol Fuel Cell for Optimal Operation

Journal of Thermal Science and Technology, 2009
Direct methanol fuel cell (DMFC) is one of promising candidates for power sources of mobile devices. Efficient operation of fuel cell system is very important for long-sustained power supply due to limited tank size.
Changhwan CHO, Yongchan KIM, Young-Soo CHANG   +2 more
doaj   +1 more source

Metal‐Free Halogen‐Engineered Carbon Nanotubes for Highly Efficient Oxygen Reduction Reaction

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
In work employs density functional theory screening to guide the halogen engineering of metal‐free, Cl‐mediated carbon nanotubes for a highly efficient oxygen reduction reaction (ORR). Cl‐mediation optimally tunes the electronic structure and binding energies of oxygen intermediates, delivering an ORR activity rivaling that of commercial Pt/C, high 4e−
Kai Zhao, Mengni Liu, Xia Zhang, Fucheng Wu, Linfeng Li, Yuxiao Liu, Muhammad Humayun, Hussein A. Younus, Xinying Xue, Sadegh Rostamnia, Jian Xia, Chundong Wang   +11 more
wiley   +1 more source

Methanol crossover and selectivity of nafion/heteropolyacid/montmorillonite nanocomposite proton exchange membranes for DMFC applications [PDF]

Iranian Journal of Chemical Engineering, 2017
In this work, we prepared the nafion/montmorillonite/heteropolyacid nanocomposite membranes for direct methanol fuel cells (DMFCs). The analyses such as X-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM ...
M. Azimi, S.J. Peighambardoust
doaj  

Sizing Direct Methanol Fuel Cells for 12/24V Portable Backup Using a Semi-Empirical Polarization Model [PDF]

E3S Web of Conferences
A computational sizing tool was developed for direct methanol fuel cells (DMFC) intended for portable backup power in 12/24 V buses. A semi-empirical polarization model was implemented in MATLAB that combines the reversible term with activation, ohmic ...
Murillo José, Parada-Acosta Maria Celeste   +1 more
doaj   +1 more source

From Mn(II)3 to Mn(IV)3: Controlled Multielectron Oxidation and Hydrocarbon Oxygenation Within a 7‐Dipy Trinuclear Scaffold

Journal of the Chinese Chemical Society, EarlyView.
A trinuclear manganese complex supported by the 7‐Dipy scaffold undergoes controlled multielectron oxidation from Mn(II)3 to high‐valent Mn(IV)3 states. Spectroscopic signatures, including 16‐line and geff ≈ 5 EPR features, reveal stepwise redox accumulation. The oxidized Mn3 cluster mediates efficient oxygen‐atom transfer to strong CH bonds, enabling
Yu‐Hsuan Chen, Peter Ping‐Yu Chen
wiley   +1 more source

Properties of Polymer Electrolyte Membranes Prepared by Blending Sulfonated Polystyrene with Lignosulfonate

Journal of Mathematical and Fundamental Sciences, 2014
A polymer electrolyte membrane widely used in PEMFCs and DMFCs is a perfluorosulfonated membrane (the Nafion membrane). This perfluorosulfonated membrane material exhibits good chemical stability and proton conductivity, but it is very expensive and ...
Siang Tandi Gonggo, Cynthia L. Radiman, Bunbun Bundjali, I Made Arcana   +3 more
doaj  

Kinetics of ε‐Caprolactone Ring Opening Polymerization: Experimental and Modeling Study

Journal of Polymer Science, EarlyView.
We present a multi‐scale model for the ring‐opening polymerization of ε‐caprolactone to polycaprolactone (PCL), approximating final melt properties. We conducted batch experiments at various temperatures and reactant ratios. Using this data, we determined the kinetic parameters.
Jakub Staś, Milan Den Haese, Luca Cannas, Anton Ginzburg, Louis Pitet, Bart Van der Bruggen, Alexandr Zubov   +6 more
wiley   +1 more source

Thermosensitive Nanostructured Coacervates Developed by Mixing ABA‐ and AB‐Block Copolymers and Their Unique Sustained Release of Nano‐Micelles in a Regulated Manner

Small, EarlyView.
Polyion complex micelles composed of blends of ABA and AB block copolymers can form coacervates with a hexagonally packed cylinder nanostructure after heating. The resulting coacervates can release the micelles under physiological conditions in a zero‐order kinetics, possessing cargo proteins.
Takumi Egashira, Hiroshi Kamizawa, Yujiro Hamada, Wataru Fushimoto, Hiroshi Y. Yoshikawa, Yuji Higaki, Atsushi Takahara, Takeshi Mori, Yoshiki Katayama, Akihiro Kishimura   +9 more
wiley   +1 more source

Recent Studies on Methanol Crossover in Liquid-Feed Direct Methanol Fuel Cells

ECS Proceedings Volumes, 1998
In this work, the effects of methanol crossover and airflow rates on the cathode potential of an operating direct methanol fuel cell are explored. Techniques for quantifying methanol crossover in a fuel cell and for separating the electrical performance of each electrode in a fuel cell are discussed.
openaire   +1 more source