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Laves phase Ir

Shuai Zhang1, Leilei Yin1, Qingqing Li1

  • 1Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Haihe Laboratory of Sustainable Chemical Transformations, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University Tianjin 300350 China.

Chemical Science
|June 9, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed novel intermetallic Iridium-Samarium (Ir2Sm) nanoparticles on graphene for superior acidic oxygen evolution reactions (OER). These catalysts show enhanced activity and stability, offering a new pathway for designing efficient electrocatalysts.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Rare earth (RE) intermetallic nanoparticles (NPs) are crucial for catalysis but challenging to synthesize due to RE metal properties.
  • Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is vital for energy applications.

Purpose of the Study:

  • To synthesize and characterize novel intermetallic Iridium-Samarium (Ir2Sm) nanoparticles on graphene.
  • To evaluate the performance of Ir2Sm NPs as an electrocatalyst for the acidic oxygen evolution reaction (OER).

Main Methods:

  • Synthesis of intermetallic Ir2Sm NPs on graphene support.
  • Structural characterization of the synthesized materials.
  • Electrochemical testing for OER activity and stability in acidic media.
  • Density Functional Theory (DFT) calculations to understand catalytic mechanisms.

Main Results:

  • Successfully synthesized a new C15 cubic MgCu2 type Laves phase intermetallic Ir2Sm.
  • Ir2Sm NPs exhibited a mass activity of 1.24 A mgIr-1 at 1.53 V and 120 h stability at 10 mA cm-2.
  • Achieved 5.6-fold higher mass activity and 12-fold enhanced stability compared to pure Ir NPs.
  • DFT calculations confirmed that Sm alloying modulates Ir's electronic structure, reducing intermediate binding energy and enhancing OER kinetics.

Conclusions:

  • Intermetallic Ir2Sm NPs represent a highly effective electrocatalyst for the acidic OER.
  • The study demonstrates a new strategy for designing high-performance rare earth alloy catalysts.
  • This work opens new avenues for rare earth intermetallic applications in catalysis.