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Chronoamperometric Investigations of the Electrode–Electrolyte Interface of a Commercial High Temperature PEM Fuel Cell
Author(s) -
Kamat A.,
Huth A.,
Klein O.,
Scholl S.
Publication year - 2010
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201000014
Subject(s) - chronoamperometry , electrolyte , electrode , proton exchange membrane fuel cell , membrane electrode assembly , phosphoric acid , transient (computer programming) , materials science , open circuit voltage , analytical chemistry (journal) , membrane , electrochemistry , chemistry , chemical engineering , voltage , cyclic voltammetry , electrical engineering , chromatography , biochemistry , computer science , metallurgy , engineering , operating system
This paper presents investigations into the chronoamperometric experiments performed on polybenzimidazole/phosphoric acid based high temperature polymer electrolyte membrane fuel cells. Electrolyte loadings in the membrane electrode assembly are varied to realise three different degrees of flooding of the electrode. Steady state as well as dynamic measurements at three different temperatures (160, 120 and 80 °C) is made via chronoamperometry on these cells. The transient current behaviour resulting from a voltage step change from open circuit voltage (∼1 V) to low voltages (0.1 V) are recorded and analysed. Analysis using the Cottrell plot depicts the underlying mass transport processes in the three different electrodes, catalyst utilisation as well as a better description of the three phase boundary reaction zone. An extension of the Cottrell equation is deduced to describe a regular commercial fuel cell behaviour.