Enhancement of Catalytic Activity and Stability of La<sub>0.6</sub>Ca<sub>0.4</sub>Fe<sub>0.7</sub>Ni<sub>0.3</sub>O<sub>2.9</sub> Perovskite with ppm Concentration of Fe in the Electrolyte for the Oxygen Evolution Reaction
Sergei V. Porokhin,
Victoria A. Nikitina,
Artem M. Abakumov
Affiliations
Sergei V. Porokhin
Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
Victoria A. Nikitina
Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
Artem M. Abakumov
Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia
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.
