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Engineering Self-Reconstruction via Flexible Components in Layered Double Hydroxides for Superior-Evolving

Jiao Liu1, Peng Ding1, Zexuan Zhu1

  • 1School of Physics Science and Technology, Chemistry Interdisciplinary Research Center, Yangzhou University, Yangzhou, 225002, China.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

This study introduces electrochemical self-reconstruction (ECSR) engineering for developing advanced oxygen evolution reaction (OER) catalysts. NiFe-based layered double hydroxides (LDHs) reconstruct into highly active NiFe-oxyhydroxides (NiFeOOH) for efficient OER.

Keywords:
electrocatalysisoxygen evolution reactionself-reconstructionwater splitting

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Transition metal catalysts for oxygen evolution reaction (OER) often require surface reconstruction to achieve optimal performance.
  • Designing pre-catalysts with flexible components susceptible to OER conditions is crucial for developing robust catalysts.

Purpose of the Study:

  • To propose and demonstrate electrochemical self-reconstruction (ECSR) as an efficient strategy for developing novel and robust OER catalysts.
  • To investigate the structural evolution and catalytic activity of NiFe-based layered double hydroxides (LDHs) undergoing ECSR.

Main Methods:

  • Construction of NiFe-based LDHs intercalated with resoluble molybdate (MoO4^2-) anions.
  • Electrochemical characterization to evaluate OER performance and durability.
  • Ex situ and in situ techniques to capture the structural evolution during ECSR.

Main Results:

  • Complete ECSR of NiFe-LDHs into active NiFe-oxyhydroxides (NiFeOOH) in alkaline media.
  • The resulting NiFeOOH catalyst exhibited a low overpotential (268 mV at 50 mA cm^-1) and excellent durability (>45 h).
  • Performance significantly surpassed the original NiFe-LDH and commercial IrO2 benchmark.

Conclusions:

  • ECSR engineering in component-flexible precursors is a promising strategy for developing highly active OER catalysts.
  • The developed NiFeOOH catalyst demonstrates superior performance for energy conversion applications.