To study the effect of partial Co substitution by Fe in the B site of MnCo2O4 spinel on its physicochemical and electrochemical properties, a series of MnCo2-xFexO4 powders (x=0.125; 0.250; 0.500; 0.750; 1.000) were synthesized by means of the sol-gel method. The produced powders were characterized by powder X ray diffraction (pXRD), scanning and transmission electron microscopy (SEM & TEM) coupled with energy dispersive spectroscopy (EDS), X ray photoelectron and absorption spectroscopy (XPS & XAS), Fourier transformed infrared spectroscopy (FTIR), and inductively coupled plasma optical emission spectroscopy (ICP OES). The electrocatalytic activity towards oxygen evolution reaction (OER) was evaluated in an alkaline environment (0.1 M KOH). From our findings, the activity increased with the addition of Fe up to x = 0.5, characterized by a decrease of overpotential at 10 mA cm-2GEO from 406 mV for MnCo2O4 to 376 mV for MnCo1.5Fe0.5O4, with a corresponding 44 mV dec 1 Tafel slope. It was identified that the OER-specific activity exhibits a volcano-type shape as a function of the eg occupancy at octahedral sites tuned by Co substitution with Fe.
Authors
- Krystian Lankauf link open in new tab ,
- dr inż. Karolina Górnicka link open in new tab ,
- Patryk Błaszczak link open in new tab ,
- dr hab. inż. Jakub Karczewski link open in new tab ,
- dr hab. inż. Jacek Ryl link open in new tab ,
- dr inż. Grzegorz Cempura,
- dr inż, Marcin Zając,
- Maciej Bik,
- Maciej Sitarz,
- prof. dr hab. inż. Piotr Jasiński link open in new tab ,
- dr hab. inż. Sebastian Molin link open in new tab
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1016/j.ijhydene.2022.12.013
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2023
