N-Coordinated Iridium-Molybdenum Dual-Atom Catalysts Enabling Efficient Bifunctional Hydrogen Electrocatalysis
Jingbo Shi1, Ren Li1, Jianting Zhang1
1State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710069, P. R. China.
Engineered N-coordinated Iridium-Molybdenum dual atoms on a carbon matrix create a highly efficient electrocatalyst for hydrogen evolution/oxidation reactions in both acidic and alkaline conditions, advancing hydrogen energy technologies.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Effective hydrogen evolution/oxidation reactions (HER/HOR) are crucial for hydrogen energy but challenging across pH.
- Existing catalysts often struggle with efficiency and stability in diverse electrolytes.
Purpose of the Study:
- To develop a bifunctional electrocatalyst for efficient HER/HOR in both acidic and alkaline media.
- To investigate the performance and stability of N-coordinated Ir-Mo dual atoms on a carbon matrix.
Main Methods:
- Ultrafast high-temperature sintering to engineer N-coordinated Ir-Mo dual atoms on a carbon matrix (Ir-Mo DAC/NC).
- Electrochemical testing in acidic and alkaline electrolytes to evaluate HER/HOR performance.
- Density Functional Theory (DFT) calculations to understand the catalytic mechanism.
Main Results:
- Ir-Mo DAC/NC exhibited superior HER/HOR performance compared to Pt/C and Ir/C in acidic and alkaline conditions.
- Achieved low HER overpotentials (11.3 mV acidic, 23 mV alkaline) and high HOR exchange currents.
- Demonstrated remarkable stability in both acidic and alkaline environments.
Conclusions:
- The electronic synergy between Ir and Mo pairs in Ir-Mo DAC/NC enhances catalytic activity by optimizing intermediate-active site interactions.
- This N-coordinated dual-atom catalyst strategy offers a promising pathway for advanced polymer fuel cells and water electrolyzers.
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