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Pd-based bimetallic nanosheets for a highly efficient nitrate reduction reaction.

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This study introduces a novel Palladium-Nickel (PdNi) core-shell catalyst for efficient ammonia synthesis via nitrate electroreduction. The catalyst demonstrates high ammonia yield and selectivity, offering a promising solution for sustainable ammonia production and zinc-nitrate batteries.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Ammonia synthesis is crucial for agriculture and industry.
  • Current ammonia production methods are energy-intensive and rely on fossil fuels.
  • Developing efficient electrocatalysts for ammonia synthesis from nitrate is an active research area.

Purpose of the Study:

  • To develop a high-performance electrocatalyst for nitrate electroreduction to ammonia.
  • To investigate the potential of Palladium-Nickel (PdNi) core-shell (NS) catalysts for ammonia synthesis.
  • To explore the application of this catalyst in zinc-nitrate batteries.

Main Methods:

  • Electrochemical synthesis of PdNi NS catalyst.
  • Nitrate electroreduction experiments were conducted in an electrochemical cell.
  • Performance was evaluated by measuring ammonia yield rate, Faradaic efficiency (FE), and durability.
  • Electrochemical impedance spectroscopy and other characterization techniques were used.

Main Results:

  • The PdNi NS catalyst achieved an outstanding ammonia yield rate of 181 micromol h-1 cm-2.
  • A superior Faradaic efficiency for ammonia (FENH3) of 99.6% was obtained.
  • The catalyst demonstrated excellent durability over 20 cycles at -0.77 V versus the reversible hydrogen electrode (RHE).

Conclusions:

  • The PdNi NS catalyst is highly effective for electrocatalytic ammonia production from nitrate.
  • This catalyst offers a promising pathway for sustainable ammonia synthesis.
  • The findings provide new insights for the development of zinc-nitrate batteries.