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Dynamic electrochemical impedance spectroscopy of Pt/C-based membrane-electrode assemblies subjected to cycling protocols

Dynamic electrochemical impedance spectroscopy of Pt/C-based membrane-electrode assemblies subjected to cycling protocols

Kategori
Vitenskapelig artikkel
Sammendrag
A PEM fuel cell membrane–electrode assembly (MEA) was characterized by dynamic electrochemical impedance spectroscopy (dEIS) before and after cycling in a single cell configuration. The cell was subjected to 100 cycles between 0.6 V and 1.5 V vs. RHE in N2/5% H2 and 80 °C and 100% RH. Initially, the impedance-plane plots contained first- and fourth-quadrant behavior, which is resulting from a reaction mechanism at the cathode involving adsorbed intermediates. After the cycling, the impedance spectra changed to display first-quadrant behavior only. This is suggested to be due to particle growth and possibly the formation of edges between agglomerated particles. The results show that dEIS is a sensitive technique to detect even very moderate changes in electrocatalyst structure.
Språk
Engelsk
Forfatter(e)
  • Mahdi Darab
  • Per Kristian Dahlstrøm
  • Magnus Skinlo Thomassen
  • Frode Seland
  • Svein Sunde
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Bærekraftig energiteknologi
År
Publisert i
Journal of Power Sources
ISSN
0378-7753
Forlag
Elsevier
Årgang
242
Side(r)
447 - 454