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ACCELERATED STRESS TESTING PROTOCOLS OF PROTON EXCHANGE MEMBRANE (PEM) ELECTROLYZERS

Savant, Sangram (2017) ACCELERATED STRESS TESTING PROTOCOLS OF PROTON EXCHANGE MEMBRANE (PEM) ELECTROLYZERS. Master's, Karlsruhe Institute of Technology.

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Abstract

Temperature, water flow rate, pressure and current density are the operational parameters of a Proton Exchange Membrane (PEM) electrolyzer that govern its performance. The effects of temperature and current density have been widely studied compared to water flow rate and pressure. In this work, the effect of water flow rate and pressure on electrolyzer performance, for a fixed temperature and input voltage, was studied. Initially, the individual effect of these parameters was studied, after which combinations of those parameters were studied in different orders of variation. The combination which caused the most degradation was observed and then tested further with time and cyclic variations. The most significant identification was that a variation of anode flow rate and cathode pressure caused more degradation than any other combination. Accelerated stress tests were designed, in order to investigate the effect of time on the degradation rate of the electrolyzer. All the accelerated stress tests were then compared and a degradation multiplier was formulated. Effect of time and cycling on the proportion of reversible and irreversible losses was observed and presented. Electrochemical Impedance Spectroscopy (EIS) is a non-invasive technique which measures the response of a system by applying a small sinusoidal disturbance signal. The advantage of using EIS is that the technique has the ability to distinguish between the different electrochemical processes. EIS was carried out after each test. From the literature study, the electrolyzer losses were identified and compared with experimental results. It was seen that while the ohmic and activation losses remain almost similar, mass transport losses show significant changes in all the experiments.

Item URL in elib:https://elib.dlr.de/114051/
Document Type:Thesis (Master's)
Title:ACCELERATED STRESS TESTING PROTOCOLS OF PROTON EXCHANGE MEMBRANE (PEM) ELECTROLYZERS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Savant, Sangramsangram.savant (at) dlr.deUNSPECIFIED
Date:6 September 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:81
Status:Accepted
Keywords:PEM Electrolysis, AST, Hydrogen production, EIS, Impedance spectroscopy, degradation
Institution:Karlsruhe Institute of Technology
Department:Hector School - Technology Business School of the KIT
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Garcia Navarro, Julio Cesar
Deposited On:19 Dec 2017 09:59
Last Modified:31 Jul 2019 20:11

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