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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
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P-doped binary Ni/Fe-N-C for enhanced oxygen electrocatalysis performance.

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Phosphorus doping in NiFe-nitrogen-carbon electrocatalysts enhances oxygen electrocatalysis and Zn-air battery performance. This P-NiFe-NC material shows superior activity and stability for energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Optimizing the micro-environment of metal catalysts on carbon supports is key for electrocatalysis.
  • Binary metal-nitrogen-carbon materials offer promising catalytic properties.

Purpose of the Study:

  • To design and synthesize a phosphorus-doped binary NiFe-nitrogen-carbon material (P-NiFe-NC).
  • To investigate the effect of phosphorus doping on the material's structure and electrocatalytic activity.
  • To evaluate the performance of P-NiFe-NC in oxygen electrocatalysis and Zn-air batteries.

Main Methods:

  • Co-precipitation and high-temperature pyrolysis using phenylphosphonamide and formamide.
  • X-ray Photoelectron Spectroscopy (XPS) for surface analysis.
  • Electrochemical testing for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).
  • Assembly and testing of P-NiFe-NC in Zn-air batteries.

Main Results:

  • Phosphorus doping induced a strong interplay between N and P, altering pyridinic N and Fe species.
  • P-NiFe-NC exhibited increased surface area and improved porosity, enhancing mass transfer.
  • Achieved a high ORR half-wave potential of 0.85 V and OER potential of 1.69 V@10.0 mA cm⁻².
  • Zn-air batteries with P-NiFe-NC demonstrated a peak power density of 161.36 mW cm⁻² and stability over 100 hours.

Conclusions:

  • Phosphorus doping is an effective strategy to enhance the electrocatalytic performance of NiFe-based carbon materials.
  • P-NiFe-NC shows excellent bifunctional activity for oxygen electrocatalysis and potential for rechargeable energy storage devices.
  • The synergistic effects of P, Ni, Fe, and N contribute to the superior performance.