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Magnetic Field Enhanced Cobalt Iridium Alloy Catalyst for Acidic Oxygen Evolution Reaction
Lamei Li1, Yue Wang1, Renat R Nazmutdinov2
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China.
Nano Letters
|May 10, 2024
Summary
Magnetic field enhanced cobalt-iridium (CoIr) nanoclusters significantly boost oxygen evolution reaction (OER) in acidic media. This breakthrough offers a promising pathway for efficient electrocatalysis, overcoming previous limitations in harsh environments.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Oxygen evolution reaction (OER) is crucial for energy conversion but suffers from sluggish kinetics, especially in acidic media.
- Existing magnetic catalysts face challenges in maintaining ordered magnetic domains under harsh acidic OER conditions.
- Developing robust catalysts for efficient acidic OER remains a significant scientific hurdle.
Purpose of the Study:
- To engineer a magnetic catalyst with enhanced activity and stability for the oxygen evolution reaction in acidic environments.
- To investigate the role of induced local magnetic moments and spin polarization in improving OER performance.
- To explore the potential of cobalt-doped iridium (CoIr) nanoclusters for magnetic field-enhanced electrocatalysis.
Main Methods:
- Synthesis of cobalt-iridium (CoIr) nanoclusters (NCs) by introducing cobalt dopants into a metallic iridium catalyst.
- Utilizing significant 3d-5d hybridization to induce local magnetic moments within the CoIr NCs.
- Employing density functional theory (DFT) calculations to analyze electronic structure and spin polarization.
Main Results:
- CoIr NCs demonstrated significantly enhanced magnetic field-assisted acidic OER activity, achieving a low overpotential of 220 mV at 10 mA cm-2.
- The catalyst exhibited remarkable long-term stability, operating for 120 hours under a constant magnetic field compared to 20 hours without.
- A 3.0-fold increase in turnover frequency (7.4 s-1 at 1.5 V vs RHE) was observed with magnetization, attributed to pronounced spin polarization.
Conclusions:
- Induced local magnetic moments via Co doping in Ir catalysts effectively enhance acidic OER performance.
- The CoIr NCs show superior activity and stability in magnetic fields, overcoming limitations in acidic media.
- Pronounced spin polarization in CoIr NCs is identified as a key factor for improved OER kinetics.
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