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PdCu Bimetallene for Enhanced Oxygen Reduction Electrocatalysis.

Ziqiang Wang1, Pengjun Tian1, Hugang Zhang1

  • 1State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China.

Inorganic Chemistry
|March 25, 2023
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Summary
This summary is machine-generated.

Researchers developed 2D palladium-copper (PdCu) bimetallic nanomaterials for efficient oxygen reduction reactions (ORR). These novel materials demonstrate superior catalytic activity and stability compared to platinum-based catalysts.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Two-dimensional (2D) metallic nanomaterials are promising for oxygen reduction reaction (ORR) catalysis due to abundant unsaturated metal sites.
  • Developing efficient and stable electrocatalysts for ORR is crucial for energy conversion technologies.

Purpose of the Study:

  • To synthesize and characterize 2D palladium-copper (PdCu) bimetallic nanomaterials with atomic layer precision.
  • To evaluate the electrocatalytic performance of the synthesized PdCu bimetallene for alkaline ORR.
  • To investigate the role of copper incorporation in enhancing ORR activity and stability.

Main Methods:

  • A carbon monoxide (CO)-confined growth strategy was employed to synthesize ultrathin 2D PdCu bimetallene.
  • Electrochemical techniques were used to assess the mass and specific activities for ORR in an alkaline medium.
  • Long-term cycling tests were conducted to evaluate the stability of the PdCu bimetallene catalyst.

Main Results:

  • The synthesized 2D PdCu bimetallene exhibited significantly enhanced ORR catalytic performance compared to commercial platinum on carbon (Pt/C).
  • Mass activity was 5.1 times higher, and specific activity was 3.7 times higher than Pt/C.
  • The PdCu bimetallene catalyst demonstrated excellent stability, with no activity loss after 5000 cycles.

Conclusions:

  • Incorporating Cu into Pd metallene creates strain and modifies electronic structure, weakening CO interaction and enhancing ORR.
  • Ultrathin 2D PdCu bimetallic nanomaterials are highly efficient and stable electrocatalysts for alkaline ORR.
  • This work provides a strategy for designing advanced 2D bimetallic nanomaterials for electrocatalysis.