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Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device
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Reversible Structural Oscillation Mediates Stable Oxygen Evolution Reaction.

Qunlei Wen1,2, Tianyang Liu3, Danji Huang2,4

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, and School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P.R. China.

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|July 8, 2025
PubMed
Summary
This summary is machine-generated.

Improving electrocatalyst durability for sustainable energy. This study reveals how iron dissolution and redeposition in nickel-iron layered double hydroxides (NiFe LDHs) impact stability during the oxygen evolution reaction (OER), demonstrating a co-doping strategy to enhance catalyst longevity.

Keywords:
Dynamic stabilityNiFe‐layered double hydroxidesOperando spectroscopyOxygen evolution reactionStructural oscillation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalyst durability is a major challenge for sustainable electrochemical applications.
  • Understanding dynamic processes like active species dissolution is crucial for improving catalyst stability.

Purpose of the Study:

  • To investigate the atomistic mechanisms behind the dynamic stability of NiFe LDHs during the oxygen evolution reaction (OER).
  • To develop a strategy for enhancing the durability of NiFe LDHs through co-doping.

Main Methods:

  • Operando spectroscopies to reveal structural oscillations in NiFe LDHs.
  • Proof-of-concept co-doping strategy using sulfur (S) and cobalt (Co).
  • Testing modified NiFe LDH in industrial water electrolysis equipment.

Main Results:

  • Identified structural oscillation of local [Ni-O2-Fe] units dependent on Fe dissolution and redeposition during OER.
  • S, Co co-doping tuned oscillations, suppressing Fe dissolution and promoting Fe redeposition, leading to enhanced dynamic stability.
  • Modified NiFe LDH demonstrated stable operation for over 800 hours in industrial water electrolysis, achieving a low energy consumption and hydrogen cost.

Conclusions:

  • The dynamic stability of NiFe LDHs is mediated by the reversible oscillation of local units, influenced by Fe dissolution and redeposition.
  • Co-doping effectively stabilizes NiFe LDHs by controlling these dynamic processes, significantly improving durability for OER.
  • This work provides a pathway for designing highly stable electrocatalysts for sustainable hydrogen production.