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Efficient Ternary Mn-Based Spinel Oxide with Multiple Active Sites for Oxygen Evolution Reaction Discovered via
Mahmoud Gamal Ahmed1,2, Ying Fan Tay2, Xiao Chi3
1School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Small (Weinheim an Der Bergstrasse, Germany)
|November 10, 2022
Summary
A novel manganese-based spinel oxide catalyst, Fe10Co40Mn50O, shows excellent performance for the oxygen evolution reaction (OER). This discovery accelerates the search for efficient and stable catalysts for renewable energy technologies.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Efficient and stable catalysts are crucial for advancing renewable energy generation.
- The oxygen evolution reaction (OER) is a key process in many energy devices.
- Discovering new metal oxide catalysts is challenging due to the vast number of possibilities.
Purpose of the Study:
- To identify new, highly efficient, and stable catalysts for the oxygen evolution reaction (OER).
- To utilize high-throughput methods for accelerated catalyst discovery.
- To understand the structure-activity relationship of novel OER catalysts.
Main Methods:
- High-throughput screening of manganese-based spinel oxides.
- Electrochemical measurements to assess catalytic activity (overpotential).
- Soft X-ray absorption spectroscopy for in-situ characterization.
- Surface characterization techniques to evaluate catalyst stability.
Main Results:
- Identification of Fe10Co40Mn50O, a novel Mn-based spinel oxide, with remarkable OER activity.
- Achieved low overpotentials of 310 mV on FTO and 237 mV on Ni foam at 10 mA cm-2.
- Attributed high activity to multiple active sites and the formation of an active oxyhydroxide phase.
- Demonstrated excellent surface structure preservation and durability after OER.
Conclusions:
- High-throughput methods are effective for rapid catalyst discovery.
- Fe10Co40Mn50O exhibits superior catalytic performance and stability for OER.
- This work contributes to the development of advanced catalysts for greener fuel technologies.
