A systematic study on the use of short circuiting for the improvement of proton exchange membrane fuel cell performance

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Title: A systematic study on the use of short circuiting for the improvement of proton exchange membrane fuel cell performance
Author(s): Gupta, G
Wu, B
Mylius, S
Offer, GJ
Item Type: Journal Article
Abstract: Proton exchange membrane fuel cells suffer from reversible performance loss during operation caused by the oxidation of the Pt catalyst which in turn reduces the electrochemically active surface area. Many fuel cell manufacturers recommend using short circuiting during the operation of the fuel cell to improve the performance of the cells over time. However, there is lack of understanding on how it improves the performance as well as on how to optimise the short circuiting strategy for different fuel cell systems. We present a simple procedure to develop an optimised short circuiting strategy by maximising the cumulative average power density gain and minimising the time required to recover the energy loss during short circuiting. We obtained average voltage improvement from 10 to 12% at different current densities for a commercial H-100 system and our short circuiting strategy showed ~2% voltage improvement in comparison to a commercial strategy. We also demonstrated that the minimum short circuiting time is a function of double layer capacitance by the use of electrochemical impedance spectroscopy.
Publication Date: 10-Nov-2016
Date of Acceptance: 14-Oct-2016
URI: http://hdl.handle.net/10044/1/42459
DOI: https://dx.doi.org/10.1016/j.ijhydene.2016.10.080
ISSN: 1879-3487
Publisher: Elsevier
Start Page: 4320
End Page: 4327
Journal / Book Title: International Journal of Hydrogen Energy
Volume: 42
Issue: 7
Copyright Statement: © 2016 Elsevier Ltd. All rights reserved.This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (E
Technology Strategy Board
Technology Strategy Board
Funder's Grant Number: EP/I038586/1 - Ref: J12967
101980
CHIS_P55265
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Electrochemistry
Energy & Fuels
Chemistry
Proton exchange membrane fuel cells
Short circuit
Pt oxidation
Degradation
OH RADICALS
DEGRADATION
REDUCTION
CATALYSTS
SURFACES
ELECTROCATALYSTS
NANOPARTICLES
OXYGEN
Energy
09 Engineering
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Dyson School of Design Engineering



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