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Nanoflower-Like High-Entropy Co-Fe-Cr-Mo-Mn Spinel for Oxygen Evolution
Yuhang Sun1, Tianmi Tang2, Liyuan Xiao2
1Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary, College of Chemistry and Chemical Engineering, Qiqihar University, Heilongjiang Province, 161006, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 14, 2023
Summary
High-entropy spinel nanosheets efficiently catalyze the oxygen evolution reaction (OER) by leveraging synergistic metal effects. This breakthrough offers a simple method for developing advanced electrocatalysts for water electrolysis.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- The oxygen evolution reaction (OER) is critical for electrolytic water splitting but suffers from slow kinetics.
- Developing efficient electrocatalysts is essential to overcome OER challenges.
Purpose of the Study:
- To synthesize and evaluate nanoflower-like high-entropy spinel (HES) nanosheets on nickel foam (NF) as an advanced OER electrocatalyst.
- To investigate the effect of metal composition on OER performance.
Main Methods:
- One-step solvothermal synthesis of Co-Fe-Cr-Mo-Mn HES nanosheets on NF.
- Electrochemical characterization of OER performance, including overpotential measurements.
- In-situ Raman spectroscopy to identify active species.
Main Results:
- The Co-Fe-Cr-Mo-Mn HES/NF exhibited a low OER overpotential of 188 mV at 10 mA cm⁻², outperforming lower-entropy catalysts.
- Increasing metal content in the spinel structure progressively reduced the OER overpotential.
- In-situ Raman spectra indicated that γ-NiOOH formed on the HES surface is a key active species.
Conclusions:
- High-entropy spinels demonstrate superior electrocatalytic activity for OER due to synergistic metal effects enhancing charge transfer and reducing reaction barriers.
- The study presents an efficient synthesis route for high-entropy electrocatalysts for OER applications.
