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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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Corrosion-Regulated Surface Reconstruction for High-Performance Oxygen Evolution Electrocatalysts.

Zhiquan Lang1,2, Zechao Zhuang3, Guang-Ling Song2,4

  • 1Institute for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China.

ACS Nano
|August 21, 2025
PubMed
Summary
This summary is machine-generated.

Controlled corrosion engineering using hypophosphite inhibitors created a uniform nickel-iron oxyhydroxide layer. This novel electrocatalyst demonstrates superior oxygen evolution performance and stability, advancing catalyst design.

Keywords:
Corrosion reconstructionelectrocatalystsoxygen evolutionoxyhydroxide nanoflowersreal-time analysis

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Corrosion Engineering

Background:

  • Surface reconstruction is common in electrocatalyst processes.
  • Controlling surface reaction kinetics during reconstruction is challenging.
  • Corrosion-engineering offers potential for controlled reconstruction.

Purpose of the Study:

  • To develop a corrosion kinetics-controlled strategy for uniform electrocatalyst reconstruction.
  • To fabricate a nickel-iron oxyhydroxide (p-(Fe,Ni)OOH) layer via controlled corrosion.
  • To investigate the impact of controlled reconstruction on electrocatalyst performance.

Main Methods:

  • Utilized a hypophosphite corrosion inhibitor for controlled corrosion-induced reconstruction.
  • Synthesized a uniform nickel-iron oxyhydroxide (p-(Fe,Ni)OOH) layer.
  • Employed operando spectroscopic characterization and first-principles computations.
  • Performed real-time analyses of ferric ion concentrations and pH values.

Main Results:

  • Achieved a uniform p-(Fe,Ni)OOH layer with excellent oxygen-evolving performance (10 mA cm-2 at 217 mV overpotential).
  • Demonstrated long-term stability (over 100 h at 100 mA cm-2).
  • Uniform reconstruction enhanced interfacial water components and intrinsic activity.
  • Identified three distinct stages in the corrosion kinetics-controlled process.

Conclusions:

  • Controlled corrosion kinetics is a viable strategy for precise electrocatalyst fabrication.
  • The developed method yields highly active and stable oxygen evolution electrocatalysts.
  • Highlights the link between corrosion chemistry and advanced electrocatalyst design.