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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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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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Operando-informed precatalyst programming towards reliable high-current-density electrolysis.

Lu Xia1,2, Bruna Ferreira Gomes3, Wulyu Jiang1

  • 1Institute of Energy Technologies, Electrochemical Process Engineering, Forschungszentrum Jülich, Jülich, Germany.

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|February 28, 2025
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Summary
This summary is machine-generated.

Researchers developed programmed activation strategies to control iron sulfide and oxide electrocatalyst reconstruction for improved durability in water electrolysis. This enhances catalyst reliability for industrial decarbonization technologies.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalysts are vital for industrial processes and decarbonization but suffer degradation due to operational changes.
  • Designing stable and reliable electrocatalysts is challenging due to unpredictable structural and compositional evolution.

Purpose of the Study:

  • To track and control the surface reconstruction of iron sulfides and oxides during the oxygen evolution reaction.
  • To develop predictive design strategies for electrocatalysts by understanding and programming their activation.

Main Methods:

  • Operando X-ray spectroscopy and computational modeling were employed to monitor catalyst behavior.
  • Activation programming strategies were developed based on thermodynamics and kinetics of surface reconstruction.

Main Results:

  • Inappropriate activation leads to uncontrolled iron oxidation and irreversible catalyst degradation.
  • Programmed activation significantly improved durability in a NiₓFe₁₋ₓS₂ model system by threefold.
  • Achieved a low cell degradation rate of 0.12 mV h⁻¹ over 550 h at high current densities (1 A cm⁻²).

Conclusions:

  • Activation programming offers control over precatalyst oxidation, enabling reliable electrocatalyst design.
  • This approach bridges predictive modeling and experimental design for enhanced electrocatalyst reliability.
  • The findings are crucial for advancing industrial water electrolysis and other high-current-density applications.