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Manipulating the Local Coordination and Electronic Structures for Efficient Electrocatalytic Oxygen Evolution.

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Non-noble metal catalysts show excellent oxygen evolution reaction (OER) performance due to structural changes. This study identifies active sites on Ni in Ni-Fe selenide, revealing how coordination structure distortion boosts OER efficiency.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Non-noble metal nanomaterials offer promising electrocatalytic activity for the oxygen evolution reaction (OER).
  • The precise nature and location of active sites in bimetallic/multimetallic catalysts remain a significant challenge and area of debate within the catalysis community.

Purpose of the Study:

  • To investigate the structure-activity correlation in a bimetallic Ni-Fe selenide-derived electrocatalyst for the oxygen evolution reaction (OER).
  • To elucidate the role of structural evolution and active site characteristics in enhancing OER performance.

Main Methods:

  • Experimental synthesis and characterization of Ni-Fe selenide nanomaterials.
  • Electrocatalytic testing for the oxygen evolution reaction (OER).
  • In-situ/operando studies combined with theoretical calculations (e.g., DFT) to probe structural evolution and active site properties.

Main Results:

  • A Ni-Fe selenide catalyst demonstrated efficient electrocatalytic performance for OER.
  • Structural evolution, including local coordination distortion and disordering of active sites during catalysis, was identified as crucial for boosting performance.
  • The active sites were identified as Ni atoms exhibiting moderate binding with oxygenous intermediates, in contrast to Fe sites which showed strong and potentially poisoning adsorptions.

Conclusions:

  • The study provides a conceptual advance by linking catalyst performance to dynamic structural changes and the nature of active sites.
  • Rational design of efficient OER electrocatalysts can be achieved by manipulating local coordination and electronic structures, particularly focusing on Ni sites.
  • Understanding the interplay between pre-catalyst structure, in-situ reconstruction, and active site properties is key for developing advanced non-noble metal electrocatalysts.