A Photoelectrochemical Model of Proton Exchange Water Electrolysis for Hydrogen Production

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Jianhu Nie ◽  
Yitung Chen ◽  
Robert F. Boehm ◽  
Shanthi Katukota
Keyword(s):  
Hydrogen Production ◽  
Polymer Electrolyte ◽  
Current Density ◽  
Power Supply ◽  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Electrical Circuit ◽  
Proton Exchange ◽  
Illumination Intensity ◽  
Electrolysis Cell

A photoelectrochemical model for hydrogen production from water electrolysis using proton exchange membrane is proposed based on Butler-Volmer kinetics for electrodes and transport resistance in the polymer electrolyte. An equivalent electrical circuit analogy is proposed for the sequential kinetic and transport resistances. The model provides a relation between the applied terminal voltage of electrolysis cell and the current density in terms of Nernst potential, exchange current densities, and conductivity of polymer electrolyte. Effects of temperature on the voltage, power supply, and hydrogen production are examined with the developed model. Increasing temperature will reduce the required power supply and increase the hydrogen production. An increase of about 11% is achieved by varying the temperature from 30°Cto80°C. The required power supply decreases as the illumination intensity becomes greater. The power supply due to the cathode overpotential does not change too much with the illumination intensity. Effects of the illumination intensity can be observed as the current density is relatively small for the examined illumination intensities.

A STUDY OF THE LOSS CHARACTERISTIC OF A HIGH PRESSURE ELECTROLYZER SYSTEM FOR HYDROGEN PRODUCTION

2015 ◽  
Vol 75 (8) ◽  
Author(s):  
Alhassan Salami Tijani ◽  
A.H. Abdol Rahim ◽  
Mohd Khairulddin Badrol Hisam
Keyword(s):  
High Pressure ◽  
Hydrogen Production ◽  
Polymer Electrolyte ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Polymer Electrolyte Membrane ◽  
Water Electrolysis ◽  
Proton Exchange ◽  
Ohmic Resistance ◽  
Loss Characteristic

The aim of this paper is to analyse loss characteristic of a high-pressure electrolyzer system for hydrogen production. Fundamental thermodynamics and electrochemical relations related to polymer electrolyte membrane (PEM) electrolyzer have been modelled in MATLAB. Simple proton exchange membrane water electrolysis is analysed on the basis of well-known Butler-Volmer kinetic for the electrodes and transport resistance in the polymer-electrolyte. The overpotential at the anode, cathode and overpotential due to ohmic resistance were analysed individually. A sensitivity analysis was carried out to study the effect of exchange current density on Faraday efficiency. At current density of 0.2A/cm2, a higher efficiency of 87.8 % was observed.  

Catalyst-coated proton exchange membrane for hydrogen production with high pressure water electrolysis

2021 ◽  
Vol 119 (12) ◽  
pp. 123903
Author(s):  
Xinrong Zhang ◽  
Wei Zhang ◽  
Weijing Yang ◽  
Wen Liu ◽  
Fanqi Min ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrogen Production ◽  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Proton Exchange ◽  
Pressure Water ◽  
Exchange Membrane

scholarly journals CFD Modeling and Experimental Validation of an Alkaline Water Electrolysis Cell for Hydrogen Production

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1634
Author(s):  
Jesús Rodríguez ◽  
Ernesto Amores
Keyword(s):  
Fluid Dynamics ◽  
Hydrogen Production ◽  
Current Density ◽  
Fluid Dynamic ◽  
Water Electrolysis ◽  
Operating Conditions ◽  
Cfd Modeling ◽  
Electrolysis Cell ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water

Although alkaline water electrolysis (AWE) is the most widespread technology for hydrogen production by electrolysis, its electrochemical and fluid dynamic optimization has rarely been addressed simultaneously using Computational Fluid Dynamics (CFD) simulation. In this regard, a two-dimensional (2D) CFD model of an AWE cell has been developed using COMSOL® software and then experimentally validated. The model involves transport equations for both liquid and gas phases as well as equations for the electric current conservation. This multiphysics approach allows the model to simultaneously analyze the fluid dynamic and electrochemical phenomena involved in an electrolysis cell. The electrical response was evaluated in terms of polarization curve (voltage vs. current density) at different operating conditions: temperature, electrolyte conductivity, and electrode-diaphragm distance. For all cases, the model fits very well with the experimental data with an error of less than 1% for the polarization curves. Moreover, the model successfully simulates the changes on gas profiles along the cell, according to current density, electrolyte flow rate, and electrode-diaphragm distance. The combination of electrochemical and fluid dynamics studies provides comprehensive information and makes the model a promising tool for electrolysis cell design.

Model-based diagnosis of proton exchange membrane water electrolysis cell: Bond graph based approach

2021 ◽  
Author(s):  
Sumit Sood ◽  
Om Prakash ◽  
Mahdi Boukerdja ◽  
Belkacem Ould-Bouamama ◽  
Jean-Yves Dieulot ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Bond Graph ◽  
Proton Exchange ◽  
Electrolysis Cell ◽  
Model Based ◽  
Exchange Membrane

Numerical Modeling of Electrochemical Process for Hydrogen Production From PEM Electrolyzer Cell

2007 ◽  
Author(s):  
Shanthi P. Katukota ◽  
Jianhu Nie ◽  
Yitung Chen ◽  
Robert F. Boehm ◽  
Hsuan-Tsung Hsieh
Keyword(s):  
Hydrogen Production ◽  
Current Density ◽  
Mass Fraction ◽  
Hydrogen Reduction ◽  
Current Collector ◽  
Proton Exchange ◽  
Porous Electrodes ◽  
Electrochemical Kinetics ◽  
Cathode Side ◽  
Electrolysis Cell

Numerical simulations of proton exchange water electrolysis for hydrogen production were performed for the purpose of examining the phenomena occurring within the proton exchange membranes (PEM) water splitting cell. A two-dimensional steady-state isothermal model of the cell has been developed. Finite element method was used to solve the multicomponent transport model coupled with flow in porous medium, charge balance and electrochemical kinetics. The Maxwell-Stefan equation is applied for the multi-component diffusion and convection in water distribution electrodes. The Butler-Volmer kinetic equation is used to obtain the local current density distribution at the catalyst reactive boundaries. Darcy’s law was applied for the flow of species in the porous electrodes. Parametric studies are performed based on appropriate mass balances, transport, and electrochemical kinetics applied to the electrolysis cell. There are significant current spikes present at the corners of the current collector. The current density varies significantly in the cell, being highest at the corners of the current collector. As the water on the anode side flows from the inlet to the outlet, the mass fraction of oxygen increases. This is the effect of oxygen concentration due to the effect oxidation of water. On the cathode side, as the mass fraction of water decreases there is little variation in the hydrogen mass fraction content due to the effect of hydrogen reduction.

scholarly journals Literature Survey of Interleaved DC-DC Step-Down Converters for Proton Exchange Membrane Electrolyzer Applications

2019 ◽  
Vol 3 (1) ◽  
pp. 33 ◽  
Author(s):  
Vittorio Guida ◽  
Damien Guilbert ◽  
Bruno Douine
Keyword(s):  
Hydrogen Production ◽  
Fossil Fuels ◽  
Proton Exchange Membrane ◽  
Water Electrolysis ◽  
Proton Exchange ◽  
Voltage Gain ◽  
Output Current ◽  
Step Down ◽  
Exchange Membrane ◽  
Current Ripple

Recently, the use of electrolyzers for hydrogen production through water electrolysis is of great interest in the industrial field to replace current hydrogen production pathways based on fossil fuels (e.g. oil, coal). The electrolyzers must be supplied with a very low DC voltage in order to produce hydrogen from the deionized water. For this reason, DC-DC step-down converters are generally used. However, these topologies present several drawbacks from output current ripple and voltage gain point of view. In order to meet these expectations, interleaved DC-DC step-down converters are considered as promising and interesting candidates to supply proton exchange membrane (PEM) electrolyzers. Indeed, these converters offer some advantages including output current ripple reduction and reliability in case of power switch failures. In addition, over the last decade, many improvements have been brought to these topologies with the aim to enhance their conversion gain. Hence, the main goal of this paper is to carry out a thorough state-of-the-art of different interleaved step-down DC-DC topologies featuring a high voltage gain, needed for PEM electrolyzer applications.

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