Tuning of eg electron occupancy of MnCo2O4 spinel for oxygen evolution reaction by partial substitution of Co by Fe at octahedral sites

Krystian Lankauf; Karolina Górnicka; Patryk Błaszczak; Jakub Karczewski; Jacek Ryl; Grzegorz Cempura; Marcin Zając; Maciej Bik; Maciej Sitarz; Piotr Jasiński; Sebastian Molin

doi:10.1016/j.ijhydene.2022.12.013

Tuning of e_g electron occupancy of MnCo₂O₄ spinel for oxygen evolution reaction by partial substitution of Co by Fe at octahedral sites

Krystian Lankauf
, Karolina Górnicka
, Patryk Błaszczak
, Jakub Karczewski
, Jacek Ryl
, Grzegorz Cempura
, Marcin Zając
, Maciej Bik
, Maciej Sitarz
, Piotr Jasiński
, Sebastian Molin

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

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 MnCo_2-xFe_xO₄ 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⁻²_GEO from 406 mV for MnCo₂O₄ to 376 mV for MnCo_1·5Fe_0·5O₄, 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 e_g occupancy at octahedral sites tuned by Co substitution with Fe.

Original language	English
Pages (from-to)	8854-8866
Number of pages	13
Journal	International Journal of Hydrogen Energy
Volume	48
Issue number	24
DOIs	https://doi.org/10.1016/j.ijhydene.2022.12.013
State	Published - Mar 19 2023
Externally published	Yes

Funding

The presented research is part of the “Nanocrystalline ceramic materials for efficient electrochemical energy conversion” project, carried out within the First TEAM programme of the Foundation for Polish Science (grant agreement nr. POIR.04.04.00-00-42E9/17-00), co-financed by the European Union under the European Regional Development Fund. Funding from Statutory Funds of WETI PG is also acknowledged. The presented research is part of the “Nanocrystalline ceramic materials for efficient electrochemical energy conversion” project, carried out within the First TEAM programme of the Foundation for Polish Science (grant agreement nr. POIR.04.04.00-00-42E9/17-00), co-financed by the European Union under the European Regional Development Fund. Funding from Statutory Funds of WETI PG is also acknowledged.

Keywords

Electrocatalysts
Element substitution
Oxygen evolution
Spinel
Water splitting

Access to Document

10.1016/j.ijhydene.2022.12.013

Cite this

Lankauf, K., Górnicka, K., Błaszczak, P., Karczewski, J., Ryl, J., Cempura, G., Zając, M., Bik, M., Sitarz, M., Jasiński, P., & Molin, S. (2023). Tuning of e_g electron occupancy of MnCo₂O₄ spinel for oxygen evolution reaction by partial substitution of Co by Fe at octahedral sites. International Journal of Hydrogen Energy, 48(24), 8854-8866. https://doi.org/10.1016/j.ijhydene.2022.12.013

@article{6073df4191274edd8e6ce17b4c7e7707,

title = "Tuning of eg electron occupancy of MnCo2O4 spinel for oxygen evolution reaction by partial substitution of Co by Fe at octahedral sites",

abstract = "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.",

keywords = "Electrocatalysts, Element substitution, Oxygen evolution, Spinel, Water splitting",

author = "Krystian Lankauf and Karolina G{\'o}rnicka and Patryk B{\l}aszczak and Jakub Karczewski and Jacek Ryl and Grzegorz Cempura and Marcin Zaj{\c a}c and Maciej Bik and Maciej Sitarz and Piotr Jasi{\'n}ski and Sebastian Molin",

note = "Publisher Copyright: {\textcopyright} 2022 Hydrogen Energy Publications LLC",

year = "2023",

month = mar,

day = "19",

doi = "10.1016/j.ijhydene.2022.12.013",

language = "English",

volume = "48",

pages = "8854--8866",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

publisher = "Elsevier",

number = "24",

}

Lankauf, K, Górnicka, K, Błaszczak, P, Karczewski, J, Ryl, J, Cempura, G, Zając, M, Bik, M, Sitarz, M, Jasiński, P & Molin, S 2023, 'Tuning of e_g electron occupancy of MnCo₂O₄ spinel for oxygen evolution reaction by partial substitution of Co by Fe at octahedral sites', International Journal of Hydrogen Energy, vol. 48, no. 24, pp. 8854-8866. https://doi.org/10.1016/j.ijhydene.2022.12.013

TY - JOUR

T1 - Tuning of eg electron occupancy of MnCo2O4 spinel for oxygen evolution reaction by partial substitution of Co by Fe at octahedral sites

AU - Lankauf, Krystian

AU - Górnicka, Karolina

AU - Błaszczak, Patryk

AU - Karczewski, Jakub

AU - Ryl, Jacek

AU - Cempura, Grzegorz

AU - Zając, Marcin

AU - Bik, Maciej

AU - Sitarz, Maciej

AU - Jasiński, Piotr

AU - Molin, Sebastian

PY - 2023/3/19

Y1 - 2023/3/19

N2 - 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.

AB - 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.

KW - Electrocatalysts

KW - Element substitution

KW - Oxygen evolution

KW - Spinel

KW - Water splitting

UR - https://www.scopus.com/pages/publications/85144794521

U2 - 10.1016/j.ijhydene.2022.12.013

DO - 10.1016/j.ijhydene.2022.12.013

M3 - Article

AN - SCOPUS:85144794521

SN - 0360-3199

VL - 48

SP - 8854

EP - 8866

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 24

ER -