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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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Boosting Acidic Oxygen Evolution Electrocatalysis by Engineering the Interfacial Water at the Electrified

Juan Zhu1, Xingye Sun2, Ningdong Feng3

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Engineered boron-inserted ruthenium dioxide (B-RuO2) enhances proton transfer and stability for the acidic oxygen evolution reaction (OER). This catalyst design prevents structural degradation, enabling over 1000 hours of stable operation.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Optimizing catalyst-electrolyte interfaces is key for efficient electrochemical reactions, particularly proton transfer kinetics.
  • Acidic oxygen evolution reaction (OER) stability is often limited by catalyst degradation.

Purpose of the Study:

  • To enhance the long-term stability of acidic OER using ruthenium dioxide (RuO2) catalysts.
  • To investigate the effect of interstitial boron (B) insertion on RuO2's interfacial water structure and OER performance.

Main Methods:

  • Synthesis of boron-inserted ruthenium dioxide (B-RuO2).
  • In situ attenuated total reflectance-surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS).
  • Local pH monitoring and ab initio molecular dynamics (AIMD) simulations.

Main Results:

  • Boron insertion facilitates proton diffusion by enhancing hydrogen-bond network connectivity, suppressing Ru oxidative collapse.
  • Interfacial water reorientation and movement of nonbonding oxygen away from the Fermi level reduce structural corrosion.
  • B-RuO2 demonstrates over 1000 hours of stable OER operation at 10 mA cm-2 and high performance in a proton exchange membrane water electrolyzer (PEMWE).

Conclusions:

  • Engineering interfacial water structure via interstitial boron insertion is a novel strategy to promote acidic OER stability.
  • This approach significantly improves proton diffusion kinetics and prevents catalyst degradation, paving the way for more robust electrolyzer designs.