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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
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Related Experiment Video

Updated: Jun 20, 2025

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Pseudo-Jahn-Teller Effect Breaks the pH Dependence in Two-Electron Oxygen Electroreduction.

Baokai Xia1, Jiale Du1, Ming Li1

  • 1Key Laboratory for Soft Chemistry and Functional Materials (Ministry of Education), School of Chemistry and Chemical Engineering, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 20, 2024
PubMed
Summary

This study introduces a pH-resistant catalyst for oxygen electroreduction to hydrogen peroxide (H2O2). Utilizing the pseudo-Jahn-Teller effect, the TiOxFy material maintains high efficiency across a wide pH range, enabling cost-effective H2O2 production.

Keywords:
Oxygen reduction reactionhydrogen peroxidepHspseudo‐Jahn–Teller effect

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Small molecule hydrogenation is pH-dependent due to varying proton donor environments.
  • Two-electron oxygen electroreduction to hydrogen peroxide (H2O2) is a sustainable process.
  • Developing pH-resilient catalysts is crucial for consistent electrochemical performance.

Purpose of the Study:

  • To demonstrate a pH-resistant oxygen electroreduction system.
  • To investigate the role of the pseudo-Jahn-Teller effect in catalyst stability.
  • To enable efficient and cost-effective hydrogen peroxide production.

Main Methods:

  • Operando Raman spectroscopy to analyze catalyst behavior.
  • Local environment analysis to understand interfacial phenomena.
  • Density functional theory (DFT) simulations to elucidate reaction mechanisms.
  • Techno-economic analysis for production cost assessment.

Main Results:

  • A novel TiOxFy catalyst exhibiting pH resistance via the pseudo-Jahn-Teller effect was developed.
  • The catalyst demonstrated minimal activity decay (3.2%) across pH 1-13, unlike common catalysts (78.6% decay).
  • High Faradaic efficiencies (93.4-96.4%) and H2O2 yield rates (up to 614 mg cm⁻² h⁻¹) were achieved.
  • The lowest H2O2 production cost was found to be $0.37 kg⁻¹.

Conclusions:

  • The pseudo-Jahn-Teller effect in TiOxFy effectively regulates local pH and intermediate adsorption/desorption.
  • This work presents a new application of the pseudo-Jahn-Teller effect for stable electrochemical processes.
  • The developed system offers a promising route for economical hydrogen peroxide synthesis across diverse pH conditions.