C15-Phase Platinum-Lanthanide Intermetallics for Efficient Hydrogen Evolution: Identifying Lanthanide's Enhanced
Wei Yan1, Yimin Mou1, Meng Li1
1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
Researchers developed a rapid Joule heating method to synthesize Platinum-Lanthanide (Pt-Ln) intermetallic compounds for electrocatalysis. The Pt2Tb/C material shows superior performance in the hydrogen evolution reaction (HER).
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum-Lanthanide (Pt-Ln) intermetallic compounds (IMCs) show promise as electrocatalysts.
- Synthesis of Pt-Ln IMCs is challenging.
- The role of ordered lanthanide sites in catalysis is not well understood.
Purpose of the Study:
- To develop an effective and rapid synthesis method for carbon-supported C15-phase Pt2Ln IMCs.
- To investigate the electrocatalytic performance of these IMCs for the alkaline hydrogen evolution reaction (HER).
- To elucidate the role of ordered lanthanide sites in enhancing HER activity.
Main Methods:
- Joule heating technology for rapid synthesis of Pt-Ln IMCs.
- Characterization of synthesized materials.
- Electrochemical testing for hydrogen evolution reaction (HER) performance.
- Analysis of catalytic mechanisms using structural and electronic properties.
Main Results:
- Successfully synthesized carbon-supported C15-phase Pt2Ln IMCs (Ln: Sm, Eu, Gd, Tb) using Joule heating.
- JH-Pt2Ln/C IMCs demonstrated excellent HER performance in alkaline media.
- JH-Pt2Tb/C exhibited the lowest overpotential (17 mV at 10 mA cm-2).
- Ordered Pt2Tb structure facilitated H* desorption via Pt2 dimer sites.
- Ordered Tb sites promoted H2O adsorption/dissociation and enhanced Pt site activity through orbital hybridization.
Conclusions:
- Joule heating is an effective and rapid method for synthesizing Pt-Ln IMCs.
- Ordered Pt2Tb sites significantly enhance HER performance through bifunctional roles.
- The developed JH-Pt2Tb/C catalyst shows potential for efficient water electrolysis.
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