Optimization and aging of Pt nanowires supported on single-walled carbon nanotubes as a cathode catalyst in polymer electrolyte membrane water electrolyser

Olli Sorsa, Rachel Backhouse, Santeri Saxelin, Taneli Rajala, Hua Jiang, Pertti Kauranen, Tanja Kallio

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

A catalyst material containing platinum nanowires supported on single-walled carbon nanotubes (CNTs) is tested thoroughly for the use as a cathode catalyst for polymer electrolyte membrane water electrolyser (PEMEL). The Nafion ionomer content, the platinum to CNT ratio and the thickness of the catalyst layer (CL) is optimized. Long-term measurement with constant current and start-stop cycling of the optimized CL is performed in order to study the durability of the catalyst material. The CLs are characterized ex-situ with TEM, XRD and Raman spectroscopy. During the constant current operation, platinum experiences Ostwald ripening type of degradation and during the cycling, particle agglomeration. The magnitude of platinum degradation is, however, lower than for a commercial Pt/C type of catalyst. Moreover, the CNTs are subjected to carbon corrosion, but the rate of corrosion is observed to be decreasing. Therefore, carbon nanotubes are considered more suitable support material for the cathode catalyst of PEMELs.

Original languageEnglish
Pages (from-to)19121-19132
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number38
DOIs
Publication statusPublished - 31 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon nanotube
  • Hydrogen evolution reaction
  • PEM Water electrolyser
  • Platinum nanowire
  • Reference electrode

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