Results 161 to 170 of about 11,572 (205)

Low methanol crossover and high efficiency direct methanol fuel cell: The influence of diffusion layers

Journal of Power Sources, 2011
This experimental work aims to investigate the possibility to reduce methanol crossover in DMFC mod- ifying diffusion layer characteristics. Improvements in crossover measurement are firstly proposed, permitting to conclude that in the investigated conditions carbon dioxide flow through the membrane can be neglected.
Andrea Casalegno, Carlo Santoro, Fabio Rinaldi   +2 more
exaly   +5 more sources

Real time measurements of methanol crossover in a DMFC

Journal of Power Sources, 2007
Methanol crossover is a serious problem in a direct methanol fuel cell (DMFC), which causes significant voltage loss and waste of fuel. Due to methanol crossover, most DMFCs must operate on a fuel with a very low methanol concentration; yet very low methanol concentration also causes a poor cell performance.
Hongtan Liu
exaly   +2 more sources

Methanol and water crossover in a passive liquid-feed direct methanol fuel cell

International Journal of Hydrogen Energy, 2010
Abstract Methanol crossover, water crossover, and fuel efficiency for a passive liquid-feed direct methanol fuel cell (DMFC) were all experimentally determined based on the mass balance of the cell discharged under different current loads. The effects of different operating conditions such as current density and methanol concentration, as well as the
Chao Xu, Amir Faghri, Xianglin Li
exaly   +2 more sources

Modeling the Effects of Methanol Crossover on the DMFC

Fuel Cells, 2004
AbstractA mathematic model is established to simulate the effects of methanol crossover on the DMFC. The transport and reactions of both oxygen and methanol at the cathode are described and the theory of “parallel electrode reactions” is applied to calculate the cathode over‐potential caused by methanol crossover.
J. Zhang, Y. Wang
exaly   +2 more sources

Molecular sieve as an effective barrier for methanol crossover in direct methanol fuel cells

International Journal of Hydrogen Energy, 2020
Abstract Methanol crossover is still a significant barrier to the commercialization of direct methanol fuel cells with wide-used Nafion® membrane. Herein, molecular sieve is introduced into the design of polymer electrolyte membrane to alleviate methanol crossover. The UZM-9 zeolite with an intermediate window size of 0.42 nm can effectively separate
Zhangxun Xia, Fulai Qi, Hai Sun
exaly   +2 more sources

A study on the overall efficiency of direct methanol fuel cell by methanol crossover current

Applied Energy, 2010
Abstract This paper was presented to determine the methanol crossover and efficiency of a direct methanol fuel cell (DMFC) under various operating conditions such as cell temperature, methanol concentration, methanol flow rate, cathode flow rate, and cathode backpressure.
Chang Sik Lee
exaly   +2 more sources

Influence of Methanol Crossover on the Fuel Utilization of Passive Direct Methanol Fuel Cell

Fuel Cells, 2008
AbstractThe effect of methanol crossover on the fuel utilization of a passive direct methanol fuel cell (DMFC) was reported. The results revealed that the Faradaic efficiency decreased from 46.9 to 17.4% when methanol concentration increased from 1.0 to 8.0 mol L–1 at the lower current density 11.1 mA cm–2.
Z -B Wang
exaly   +2 more sources

Nanofludic Analysis on Methanol Crossover of Direct Methanol Fuel Cells

ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B, 2008
Direct methanol fuel cells (DMFCs) are considered as a competitive power source candidate for portable electronic devices. Nafion® has been widely used for the electrolyte of DMFCs because of its good proton conductivity and high chemical and mechanical stability.
Peng-Yu Chen, Wei-Hui Chen, Che-Wun Hong
openaire   +1 more source

The degree and effect of methanol crossover in the direct methanol fuel cell

Journal of Power Sources, 1998
A simple model is presented to describe the permeation of methanol from the anode to the cathode in direct methanol fuel cell (DMFC). Measured permeation rates of water and methanol through Nafion® 117 under varied pressure differentials across the membrane are used to determine key parameters in the model.
John Cruickshank, Keith Scott
openaire   +1 more source

Numerical simulation of methanol crossover in flowing electrolyte-direct methanol fuel cell

Journal of Power Sources, 2022
Abstract A two-dimensional, comprehensive model for flowing electrode direct methanol fuel cell (FEDMFC) is developed to investigate cell performance and prevention of methanol crossover. Governing equations consists of the electron and proton transfer equations, mass and momentum conservation equation, energy transfer equations, species transfer of ...
Wu Yujing, Zhou Hongxiu, Zhang Ao, Zhao Leqing   +3 more
openaire   +1 more source