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Corrosion02:49

Corrosion

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Corrosion-Engineered Morphology and Crystal Structure Regulation toward Fe-Based Efficient Oxygen Evolution

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Summary

Corrosion engineering created FeAl layered double hydroxide (LDH) nanosheets for efficient oxygen evolution reactions. These catalysts show low overpotentials and excellent durability, highlighting their potential in electrochemical applications.

Keywords:
corrosion engineerdealloyingelectrocatalystlayered double hydroxidesoxygen evolution reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Optimizing catalyst performance relies on controlling morphology and crystal structure.
  • Layered double hydroxides (LDHs) are promising electrocatalysts.
  • Developing efficient and durable catalysts for oxygen evolution reactions (OER) is crucial for energy technologies.

Purpose of the Study:

  • To prepare FeAl layered double hydroxide (LDH) nanosheets and Fe3O4 nanooctahedrons using corrosion engineering.
  • To evaluate the electrocatalytic performance of FeAl-LDH nanosheets for oxygen evolution reactions (OER).

Main Methods:

  • Corrosion engineering was utilized to modify dealloying conditions for catalyst synthesis.
  • FeAl layered double hydroxide (LDH) nanosheets and Fe3O4 nanooctahedrons were prepared.
  • Electrochemical performance for OER was tested in 1 M KOH solution.

Main Results:

  • FeAl-LDH nanosheets exhibited excellent catalytic activity for OER.
  • Low overpotentials of 333 mV (glass carbon electrode) and 284 mV (Ni foam) at 10 mA cm-2 were achieved.
  • A small Tafel slope of 36 mV dec-1 and 24-hour durability without deactivation were observed.

Conclusions:

  • FeAl-LDH nanosheets demonstrate superior catalytic properties for OER.
  • The enhanced performance is attributed to Al and Fe synergy, oxygen vacancies, and the 2D layered structure.
  • This study presents a facile method for fabricating high-performance electrocatalysts.