Enhancement of catalytic activity and stability of la0.6ca0.4fe0.7ni0.3o2.9 perovskite with ppm concentration of fe in the electrolyte for the oxygen evolution reaction

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Abstract

The catalytic activity and stability of an iron-nickel based oxygen-deficient perovskite for the oxygen evolution reaction (OER) are drastically improved with the ppm additive of Fe ions to the alkaline electrolyte. The enhancement is attributed to a 1–2 nm restructured Ni0.5Fe0.5Ox (OH)2-x (oxy)hydroxide layer, as demonstrated with scanning transmission electron microscopy. La0.6Ca0.4Fe0.7Ni0.3O2.9 shows almost a four-fold increase in OER activity after Fe addition relative to the as-prepared pristine electrolyte, which demonstrates the low Tafel slope of 44 ± 2.4 mV dec−1 and the superior intrinsic activity of 706 ± 71 A g−1oxide at 1.61 V vs. RHE.

Original languageEnglish
Article number6403
JournalMaterials
Volume14
Issue number21
DOIs
Publication statusPublished - 1 Nov 2021

Keywords

  • Lattice oxygen mechanism
  • Oxygen evolution reaction
  • Perovskite
  • Water splitting

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