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A new trimetallic nickel-iron-chromium (NiFeCr) nanoalloy significantly boosts oxygen evolution reaction (OER) electrocatalyst performance. This advanced material accelerates electron transfer, offering a promising strategy for efficient energy conversion technologies.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for energy conversion but is kinetically sluggish.
  • Accelerating electron transfer kinetics is key to improving OER efficiency.
  • Doping transition metals into high valence states can enhance inherent catalytic activity.

Purpose of the Study:

  • To synthesize a novel trimetallic NiFeCr nanoalloy as an electrocatalyst for the oxygen evolution reaction.
  • To investigate the mechanism of Cr doping in enhancing OER activity.
  • To evaluate the OER performance of the NiFeCr nanoalloy compared to undoped alloys.

Main Methods:

  • Synthesis of a trimetallic NiFeCr nanoalloy by doping chromium into a Ni3Fe alloy.
  • In-situ characterization of the core-shell NiFeCr@NiFeOOH structure formed during OER.
  • Electrochemical testing of OER performance in 1.0 M KOH.

Main Results:

  • The NiFeCr alloy transformed into a core-shell NiFeCr@NiFeOOH structure during OER.
  • High-valence Cr6+ at the interface acted as an electron acceptor, accelerating electron transfer.
  • The NiFeCr@NiFeOOH catalyst achieved a low overpotential of 209 mV at 25 mA cm-2, outperforming Ni3Fe.

Conclusions:

  • The NiFeCr nanoalloy demonstrates excellent OER activity due to the in-situ formed core-shell structure and accelerated electron transfer.
  • Chromium doping provides a viable strategy to enhance the performance of NiFe-based OER electrocatalysts.
  • This work presents a new approach for designing highly active electrocatalysts for the oxygen evolution reaction.