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Nanoporous Intermetallic Pd3 Bi for Efficient Electrochemical Nitrogen Reduction.

Xuejing Wang1, Min Luo2, Jiao Lan1

  • 1College of Materials Science and Engineering, Hunan University, Changsha, Hunan, 410082, China.

Advanced Materials (Deerfield Beach, Fla.)
|April 1, 2021
PubMed
Summary

Researchers developed nanoporous intermetallic Pd3Bi for efficient electrocatalytic nitrogen reduction. This advanced material offers high ammonia yield and selectivity under ambient conditions, advancing artificial nitrogen fixation technology.

Keywords:
Pd 3Bielectrocatalytic nitrogen reductionintermetallicsnanoporous alloys

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalytic nitrogen reduction is a promising green technology for artificial nitrogen fixation.
  • Current methods face challenges with low yield and poor selectivity.

Purpose of the Study:

  • To develop an efficient electrocatalyst for nitrogen reduction reaction (NRR) under ambient conditions.
  • To investigate the performance and mechanism of a novel nanoporous intermetallic catalyst.

Main Methods:

  • Synthesis of nanoporous ordered intermetallic Pd3Bi from chemically etched nanoporous PdBi2.
  • Electrochemical characterization of the catalyst for NRR.
  • Operando X-ray absorption spectroscopy and density functional theory calculations to elucidate the mechanism.

Main Results:

  • The Pd3Bi catalyst achieved a high NH3 yield rate of 59.05 ± 2.27 µg h−1 mgcat−1 and a Faradaic efficiency of 21.52 ± 0.71% at -0.2 V.
  • The catalyst demonstrated superior performance compared to most reported catalysts for electrochemical NRR.
  • Operando XAS and DFT revealed strong Pd-Bi coupling facilitating N2 adsorption and activation.

Conclusions:

  • Nanoporous intermetallic Pd3Bi is a highly efficient electrocatalyst for ambient nitrogen reduction.
  • The catalyst's structure and electronic properties, particularly Pd-Bi coupling, are crucial for its enhanced NRR performance.
  • This work provides insights into designing advanced catalysts for artificial nitrogen fixation.