Cobalt oxide (CoOx) coated Ni foam anodes for high temperature (150 °C) and pressure (45 bar) alkaline electrolysis

Pradipkumar Leuaa*, Yousef Alizad Farzin, Sarmad Iqbal, Christodoulos Chatzichristodoulou

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

CoOx-coated Ni foam (CoOx/NF) electrodes are evaluated as anodes for high temperature and pressure (HTP) alkaline electrolysis. The electrodes are tested for the oxygen evolution reaction (OER) from room temperature to 150 °C at 45 bar pressure in 45 wt% KOH and compared with commercially available pristine NF and Inconel-coated NF (Inconel/NF) electrodes. Although the Inconel/NF electrode shows the best performance at 25 °C and 45 bar pressure, the performance of CoOx/NF and Inconel/NF become comparable upon raising the operating temperature to 150 °C. During a long-term (108 h) stability test at 150 °C and 45 bar pressure, the CoOx/NF electrode maintained stable performance, requiring an overpotential of 185 mV at 500 mA cm−2. In contrast, the Inconel/NF electrode experienced an increase in overpotential from 182 mV to 208 mV after 84 h of operation under identical conditions. The structural and chemical changes in these electrodes were investigated using post-mortem scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), comparing their evolution to that of the fresh electrodes.
Original languageEnglish
Article number235625
JournalJournal of Power Sources
Volume625
Number of pages10
ISSN0378-7753
DOIs
Publication statusPublished - 2025

Keywords

  • Alkaline electrolysis
  • Cobalt oxide
  • High temperature and pressure electrochemistry
  • Inconel
  • Oxygen evolution reaction

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