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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Engineering Isolated Mn-N2C2 Atomic Interface Sites for Efficient Bifunctional Oxygen Reduction and Evolution

Huishan Shang1, Wenming Sun2, Rui Sui3

  • 1Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

Nano Letters
|June 10, 2020
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Summary

A novel carbon-based Mn-N2C2 electrocatalyst efficiently drives both oxygen reduction (ORR) and oxygen evolution (OER) reactions. This bifunctional catalyst utilizes distinct Mn active sites for each reaction, offering a new strategy for energy conversion.

Keywords:
Manganese single atom catalystatomic interfacebifunctional electrocatalysisoperando X-ray absorption spectroscopy

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Oxygen-involved electrochemical reactions are vital for energy conversion technologies.
  • Developing efficient bifunctional electrocatalysts for both oxygen reduction and evolution reactions is a key challenge.

Purpose of the Study:

  • To design and investigate a novel carbon-based Mn-N2C2 bifunctional electrocatalyst.
  • To elucidate the atomic and electronic structure responsible for the catalytic activity in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).

Main Methods:

  • Rational design of a carbon-based Mn-N2C2 single-atom electrocatalyst.
  • Electrochemical characterization including half-wave potential and overpotential measurements in alkaline media.
  • Operando X-ray absorption fine structure (XAFS) spectroscopy.
  • Density functional theory (DFT) calculations.

Main Results:

  • The Mn-N2C2 electrocatalyst achieved a half-wave potential of 0.915 V vs RHE for ORR.
  • An overpotential of 350 mV at 10 mA cm-2 was recorded for OER.
  • Operando XAFS and DFT revealed Mn2+-N2C2 sites for ORR and Mn4+-N2C2 sites for OER.
  • Synergistic effects between Mn sites and carbon support optimize intermediate adsorption.

Conclusions:

  • The designed Mn-N2C2 electrocatalyst demonstrates excellent bifunctional activity for ORR and OER.
  • Atomic interface engineering with distinct Mn oxidation states is crucial for selective catalysis.
  • This work presents a promising atomic interface strategy for nonprecious bifunctional single-atom electrocatalysts.