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

Materials

Artem M. Abakumov¹  Victoria A. Nikitina¹  Sergei V. Porokhin¹ 

[1] Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, Nobel Street 3, 143026 Moscow, Russia;

关键词: oxygen evolution reaction;    water splitting;    perovskite;    lattice oxygen mechanism;   

DOI  :  10.3390/ma14216403

来源: DOAJ

【 摘 要 】

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 Ni_0.5Fe_0.5O_x(OH)_2-x (oxy)hydroxide layer, as demonstrated with scanning transmission electron microscopy. La_0.6Ca_0.4Fe_0.7Ni_0.3O_2.9 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⁻¹_oxide at 1.61 V vs. RHE.

【 授权许可】

Unknown