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Two-dimensional 1T-phase MnxIr1-xO2 for high-performance acidic oxygen evolution reaction
Jialin Miao1, Hao Yu1, Dingyanyan Zhou2
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China. qshao@suda.edu.cn.
Researchers developed 2D 1T-phase manganese-iridium oxide (1T-Mn0.8Ir0.2O2) nanosheets for efficient green hydrogen production via proton exchange membrane water electrolysis (PEMWE). This novel catalyst significantly enhances activity and durability, addressing key challenges in sustainable hydrogen generation.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Proton exchange membrane water electrolysis (PEMWE) is crucial for green hydrogen production, but the oxygen evolution reaction (OER) kinetics are sluggish.
- Iridium oxide (IrO2) offers stability but lacks sufficient catalytic activity for industrial PEMWE applications.
- Developing efficient and durable OER catalysts is essential to improve PEMWE performance and reduce costs.
Purpose of the Study:
- To synthesize and characterize novel 2D 1T-phase manganese-iridium oxide (1T-Mn0.8Ir0.2O2) nanosheets.
- To evaluate the catalytic activity and durability of 1T-Mn0.8Ir0.2O2 for the oxygen evolution reaction (OER) in acidic media.
- To assess the performance of 1T-Mn0.8Ir0.2O2 as an anode catalyst in a practical proton exchange membrane water electrolysis (PEMWE) system.
Main Methods:
- A molten-alkali mechanochemical method was employed to synthesize 2D 1T-Mn0.8Ir0.2O2 nanosheets.
- Electrochemical performance was evaluated in 0.5 M H2SO4, measuring overpotential, Tafel slope, and mass activity.
- Durability was assessed through chronoamperometry at a constant current density and by testing in a PEMWE cell.
Main Results:
- The synthesized 1T-Mn0.8Ir0.2O2 exhibited an overpotential of 274 mV and a Tafel slope of 70.77 mV dec-1 at 10 mA cm-2.
- The catalyst demonstrated excellent durability, maintaining performance for 75 hours in 0.5 M H2SO4 and 500 hours in a PEMWE system at 1000 mA cm-2.
- Mass activity of 1T-Mn0.8Ir0.2O2 at 1.5 V vs. RHE was 390 mA mgIr-1, significantly outperforming commercial iridium oxide.
Conclusions:
- The 2D 1T-Mn0.8Ir0.2O2 nanosheets represent a highly active and durable OER catalyst for PEMWE.
- This material offers a promising strategy to reduce iridium loading in PEMWE, mitigating issues related to iridium scarcity and cost.
- The developed catalyst provides a feasible pathway towards cost-effective and sustainable green hydrogen production.
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