Triode Solid Oxide Fuel Cell Operation Under Sulfur‐Poisoning Conditions

Abstract

The triode solid oxide fuel cell (SOFC) is a three electrodes configuration. The third electrode, so-called auxiliary, is connected in a way to run in electrolysis mode, while cathode and anode operate in normal fuel cell mode. This mixed operation allows to reach anode-cathode potential differences which are not accessible in normal operation. In this work, the benefits of triode operation under sulfur-poisoning conditions are shown. In particular, the difference between conventional and triode operation mode under 2ppm of H 2 S in H 2 are analyzed. The partial reversibility of sulfur poisoning is investigated and the observed regeneration processes are discussed for both the conventional and triode operation. After each sequence of exposure and regeneration, IV and EIS characteristics are taken. The electrochemical impedance spectra are further processed by computing the distribution of relaxation times (DRT). During triode operation, less degradation during exposure and faster stabilization after exposure and regeneration with respect to conventional operation mode are observed.

Carbon monoxide poisoning and mitigation strategies for polymer electrolyte membrane fuel cells – A review

“…-Also used in electrolysers and batteries. [186][187][188][189][190] Periodic variation in the fuel supply Cyclic injection of pure H2…”

Μελέτη Της Τριοδικής Λειτουργίας Κυψελών Καυσίμου

“…• Τον αδιάστατο συντελεστή απόδοσης, Λ: Σε όλες τις παραπάνω μελέτες λοιπόν, αποδείχτηκε ότι ο τριοδικός τύπος λειτουργίας ενισχύει τη λειτουργία των κελιών καυσίμων, όπου η απόδοσή τους είναι χαμηλή, κυρίως λόγω σημαντικής ανοδικής υπέρτασης [150], [159], [160], [163], [164], [166], [167], [169], [170]. Το είδος του ειδώλου του δείγματος εξαρτάται από το σχήμα και τη μορφή της δέσμης των ηλεκτρονίων, όπου υπάρχουν δύο περιπτώσεις σχηματισμού του ειδώλου [13]:…”