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A highly efficient atomically thin curved PdIr bimetallene electrocatalyst.

Fan Lv1, Bolong Huang2, Jianrui Feng1

  • 1School of Materials Science and Engineering, Peking University, Beijing 100871, China.

National Science Review
|October 25, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel palladium-iridium (PdIr) bimetallene catalyst. This 2D material exhibits exceptional performance in the hydrogen evolution reaction (HER) and formic acid oxidation reaction (FAOR) due to its unique strain effects.

Keywords:
PdIr alloyatomically thinelectrocatalystmetallenestrain

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Two-dimensional (2D) multi-metalenes with high surface areas offer potential for tuning electronic properties via strain effects, creating novel electrocatalysts.
  • Synthesizing atomically thin multi-metalenes remains a significant challenge, hindering their application in sustainable energy devices.
  • Precise control over surface electronic structure is crucial for developing efficient electrocatalysts for reactions like hydrogen evolution and formic acid oxidation.

Purpose of the Study:

  • To develop a new synthetic method for an atomic-level palladium-iridium (PdIr) bimetallene.
  • To investigate the catalytic performance of the synthesized PdIr bimetallene in the hydrogen evolution reaction (HER) and formic acid oxidation reaction (FAOR).
  • To understand the underlying mechanisms, including strain effects, responsible for the observed catalytic activity.

Main Methods:

  • Synthesis of an atomic-level PdIr bimetallene with an average thickness of approximately 1.0 nm.
  • Characterization of the bimetallene's electrochemical active surface area (ECSA) and catalytic performance.
  • Density Functional Theory (DFT) calculations to analyze the surface strain effect, electronic structure, and reaction pathways.

Main Results:

  • The synthesized curved PdIr bimetallene achieved a high ECSA of 127.5 ± 10.8 m² gPd+Ir⁻¹.
  • The catalyst demonstrated superior performance for HER and FAOR, characterized by low overpotential, ultrahigh activity, and enhanced stability.
  • DFT calculations revealed a unique lattice tangential strain in the PdIr bimetallene, inducing surface distortion and creating active regions with specific electronic properties.

Conclusions:

  • The novel synthetic method successfully produced an atomic-level PdIr bimetallene with significant potential as a 2D electrocatalyst.
  • The observed enhanced catalytic activity for HER and FAOR is attributed to the unique strain effect and resulting electronic structure modifications.
  • This work opens new avenues for designing high-performance electrocatalysts for sustainable energy applications by leveraging strain engineering in 2D materials.