Transients of Polymer Electrolyte Fuel Cell and Hydrogen Tank

2009 ◽  
Author(s):  
Yun Wang ◽  
Xiaoguang Yang
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Dynamic Models ◽  
Cell Voltage ◽  
Polymer Electrolyte Fuel Cells ◽  
Dynamic Responses ◽  
Polymer Electrolyte Fuel Cell ◽  
Electrochemical Double Layer ◽  
The One

This paper seeks to develop 3D dynamic models for polymer electrolyte fuel cells (PEFCs) and hydrogen tanks, respectively. The dynamic model of PEFCs consists of multiple layers of a single PEFC and couples the various dynamic mechanisms in fuel cells, such as electrochemical double-layer discharging/charging, species transport, heat transfer, and membrane water uptake. The one of hydrogen tanks includes a 3D description of the hydride kinetics coupled with mass/heat transport in the hydrogen tank. Transient of fuel cell during step change in current is simulated. Dynamic responses of the cell voltage and heat generation rate are discussed. Hydrogen absorption process in the tank is considered. Temperature, reaction rate and heat rejection in the fuel tank are presented. Efforts are also made to discuss the coupling of these two systems in practice and associated issues.

3D Modeling of Polymer Electrolyte Fuel Cell and Hydride Hydrogen Storage Tank

2010 ◽  
Author(s):  
Yun Wang
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Heat Transport ◽  
Dynamic Models ◽  
Cell Model ◽  
Polymer Electrolyte Fuel Cells ◽  
Water Dynamics ◽  
Polymer Electrolyte Fuel Cell ◽  
Hydride Hydrogen ◽  
Electrochemical Double Layer

3D dynamic models are developed for polymer electrolyte fuel cells (PEFCs) and hydrogen tanks, respectively. In the fuel cell model, we consider the major transport and electrochemical processes within the key components of a single PEFC that govern fuel cell transient including the electrochemical double-layer behavior, mass/heat transport, liquid water dynamics, and membrane water uptake. As to modeling hydrogen tanks, we consider a LaNi5-based system and develop a general formula that describes hydrogen absorption/desorption. The model couples the hydride reaction kinetics and mass/heat transport. The dynamic characteristics of the PEFC and hydrogen tank, together with the possible coupling of the two systems, are discussed.

Wetting properties of porous high temperature polymer electrolyte fuel cells materials with phosphoric acid

2019 ◽  
Vol 21 (24) ◽  
pp. 13126-13134 ◽  
Author(s):  
J. Halter ◽  
T. Gloor ◽  
B. Amoroso ◽  
T. J. Schmidt ◽  
F. N. Büchi
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Fuel Cell ◽  
Phosphoric Acid ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Polymer Electrolyte Fuel Cell ◽  
Wetting Behavior ◽  
Wetting Properties ◽  
Fuel Cell Materials

The influence of phosphoric acid temperature and concentration on the wetting behavior of porous high temperature polymer electrolyte fuel cell materials is investigated.

Dynamic Characteristics of Polymer Electrolyte Fuel Cell and Hydrogen Tank

2010 ◽  
Author(s):  
Yun Wang
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Dynamic Characteristics ◽  
Dynamic Models ◽  
Reaction Rates ◽  
Transport Processes ◽  
Water Dynamics ◽  
Polymer Electrolyte Fuel Cell ◽  
Limiting Factors ◽  
Electrochemical Double Layer

In this paper, we develop 3D dynamic models for polymer electrolyte fuel cells (PEFCs) and hydrogen tanks, respectively. The PEFC model considers the key components of a single PEFC and couples the various mechanisms that govern fuel cell transient including the electrochemical double-layer behavior, species transport, heat transfer, liquid water dynamics, and membrane water uptake. The hydrogen tank model includes a 3D description of the hydrogen discharging kinetics coupled with mass/heat transport in a LaNi5–based hydrogen tank. Efforts are made to discuss the dynamic characteristics of the PEFC and hydrogen tank together with the possible coupling of the two systems. Local electrochemical and hydride reaction rates, transport processes and associated limiting factors are investigated.

Modeling and Numerical Simulation of PEM Fuel Cell Transient

2010 ◽  
Author(s):  
Yun Wang ◽  
Pengtao Sun
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Pem Fuel Cells ◽  
Polymer Electrolyte Fuel Cells ◽  
Operating Conditions ◽  
Dynamic Responses ◽  
Density Distributions ◽  
Power Load ◽  
Electrochemical Double Layer ◽  
Detailed Picture

This paper develops a 3D dynamic model for polymer electrolyte fuel cells (PEFCs also called PEM fuel cells) and investigates the internal physicochemical processes that occur during PEFC transients as well as fuel cell dynamic responses. This model couples various dynamic mechanisms in the key components of PEFC, such as electrochemical double-layer discharging/charging, species transport, heat transfer, and membrane water uptake. The model is further discretized for 3D numerical simulations with focus on transient operation upon the step change in power density. The numerical results show that over/undershoot dynamic responses may take place during transient. A detailed picture of internal operating conditions, such as water and current density distributions, is presented to develop a comprehensive understanding of fuel cell transient during power/load variation.

Remarkably durable platinum cluster supported on multi-walled carbon nanotubes with high performance in an anhydrous polymer electrolyte fuel cell

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 108158-108163 ◽  
Author(s):  
Zehui Yang ◽  
Xinxin Yu ◽  
Yunfeng Zhang ◽  
Guodong Xu
Keyword(s):  
Carbon Nanotubes ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
High Performance ◽  
Polymer Electrolyte Fuel Cells ◽  
Polymer Electrolyte Fuel Cell ◽  
Platinum Cluster ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Reducing platinum (Pt) usage in the polymer electrolyte fuel cells (PEFCs) has become one of the main issues in the global commercialization of PEFCs.

scholarly journals Propriedades físico-químicas relacionadas ao desenvolvimento de membranas de Nafion® para aplicações em células a combustível do tipo PEMFC

Polímeros ◽  
2008 ◽  
Vol 18 (4) ◽  
pp. 281-288 ◽  
Author(s):  
Carlos E. Perles
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cell

Embora não seja tecnologia recente, as células a combustível ou Fuel Cells (FC) continuam recebendo grande atenção, pois são consideradas como "fontes de energia do futuro" devido a características como alto rendimento energético e baixa emissão de poluentes, permitindo a extensão o tempo de vida das reservas fósseis e contribuindo para a melhoria da qualidade de vida. Atualmente, as pesquisas estão direcionadas, principalmente, ao desenvolvimento de FC para aplicações em sistemas móveis e portáteis. De todas as tecnologias existentes, a mais promissora para essa finalidade é a célula a combustível de eletrólito polimérico, conhecida como PEMFC (Polymer Electrolyte Fuel Cell) cuja pesquisa encontra-se focada, principalmente, no desenvolvimento de membranas poliméricas, com o objetivo de reduzir os custos de produção. Este trabalho será focado nos aspectos físico-químicos do desenvolvimento de membranas poliméricas. Serão discutidos aspectos estruturais do Nafion® relacionado-os as seguintes propriedades físico-químicas: fluxo eletrosmótico, permeabilidade gasosa, transporte de água através da membrana, estabilidade química e térmica. Toda a discussão será realizada para polímeros perfluorados, utilizando o Nafion® como modelo representante dessa classe de polímeros.

scholarly journals Exergy Analysis of Polymer Electrolyte Fuel Cell Systems Using Methanol

2003 ◽  
Author(s):  
Akimitsu Ishihara ◽  
Shigenori Mitsushima ◽  
Nobuyuki Kamiya ◽  
Ken-Ichiro Ota
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Steam Reforming ◽  
Waste Heat ◽  
Material Balance ◽  
Cell Voltage ◽  
Exergy Efficiency ◽  
Exergy Loss ◽  
Polymer Electrolyte Fuel Cell ◽  
The Difference

An exergy (available energy) analysis has been conducted on a typical polymer electrolyte fuel cell (PEFC) system using methanol. The material balance and enthalpy balance were calculated for the PEFC system using methanol steam reforming, and the exergy flow was obtained. Based on these results, the exergy loss in each unit was obtained, and the difference between the enthalpy and exergy was discussed. The exergy loss in this system was calculated to be 178kJ/mole MeOH for the steam reforming process of methanol. Although the enthalpy efficiency approached unity as the recovery rate of the waste heat from the cell approached unity, the exergy efficiency remained around 0.45 since the cell’s operating temperature of 80°C is low. It was also found that the cell voltage should exceed 0.82V in order to obtain the exergy efficiency of 0.5 or higher. A direct methanol fuel cell (DMFC) was analyzed using the exergy and compared with the methanol reforming PEFC. In order to obtain the exergy efficiency higher than that of PEFC with steam reforming, the cell voltage of the DMFC should be 0.48V or greater at the current density of 600mA/cm2.

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