Electrochemical Investigations of Double Perovskite M2NiMnO6 (Where M = Eu, Gd, Tb) for High-Performance Oxygen Evolution Reaction

Kiran P Shinde; Harish S Chavan; Amol S Salunke; Jeongseok Oh; Abu Talha Aqueel Ahmed; Nabeen K Shrestha; Hyunsik Im; Joonsik Park; Akbar I Inamdar

doi:10.3390/nano13233076

Electrochemical Investigations of Double Perovskite M₂NiMnO₆ (Where M = Eu, Gd, Tb) for High-Performance Oxygen Evolution Reaction

Nanomaterials (Basel). 2023 Dec 4;13(23):3076. doi: 10.3390/nano13233076.

Authors

Kiran P Shinde¹, Harish S Chavan², Amol S Salunke³, Jeongseok Oh¹, Abu Talha Aqueel Ahmed³, Nabeen K Shrestha³, Hyunsik Im³, Joonsik Park¹, Akbar I Inamdar³

Affiliations

¹ Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Republic of Korea.
² Department of Chemistry and Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea.
³ Division of Physics and Semiconductor Science, Dongguk University, Seoul 04620, Republic of Korea.

Abstract

Double perovskites are known for their special structures which can be utilized as catalyst electrode materials for electrochemical water splitting to generate carbon-neutral hydrogen energy. In this work, we prepared lanthanide series metal-doped double perovskites at the M site such as M₂NiMnO₆ (where M = Eu, Gd, Tb) using the solid-state reaction method, and they were investigated for an oxygen evolution reaction (OER) study in an alkaline medium. It is revealed that the catalyst with a configuration of Tb₂NiMnO₆ has outstanding OER properties such as a low overpotential of 288 mV to achieve a current density of 10 mAcm^-2, a lower Tafel slope of 38.76 mVdec^-1, and a long cycling stability over 100 h of continuous operation. A-site doping causes an alteration in the oxidation or valence states of the NiMn cations, their porosity, and the oxygen vacancies. This is evidenced in terms of the Mn⁴⁺/Mn³⁺ ratio modifying electronic properties and the surface which facilitates the OER properties of the catalyst. This is discussed using electrochemical impedance spectroscopy (EIS) and electrochemical surface area (ECSA) of the catalysts. The proposed work is promising for the synthesis and utilization of future catalyst electrodes for high-performance electrochemical water splitting.

Keywords: double perovskite; electrocatalysis; electrochemical properties; oxygen evolution reaction; water splitting.

Grants and funding

This research received no external funding.