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Boron doping stabilizes ruthenium oxide (RuO2) catalysts for water electrolysis by enabling a hydroxyl relay mechanism. This strategy enhances both catalytic activity and durability for proton exchange membrane water electrolysis (PEMWE).

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Ruthenium (Ru) is a potential alternative to iridium (Ir) for proton exchange membrane water electrolysis (PEMWE).
  • Ruthenium-based catalysts exhibit poor stability in acidic conditions due to the oxygen evolution reaction (OER).
  • Developing stable and active Ru catalysts is crucial for industrial PEMWE applications.

Purpose of the Study:

  • To enhance the stability and activity of RuO2 catalysts for PEMWE.
  • To investigate the effect of boron (B) doping on RuO2 catalyst performance.
  • To explore the mechanism of hydroxyl relay strategy for OER catalysis.

Main Methods:

  • Synthesis of boron-doped ruthenium oxide nanosheets (B-RuO2 NS).
  • Characterization of catalyst structure and properties.
  • Electrochemical testing to evaluate OER activity and stability.

Main Results:

  • Boron doping introduced three-coordinate B sites that facilitate hydroxyl group relay.
  • B-doped RuO2 NS exhibited an ultralow overpotential of 190 mV at 10 mA cm-2.
  • Exceptional stability was achieved: 1600 h at 10 mA cm-2 and 200 h at 1 A cm-2.

Conclusions:

  • Hydroxyl relay engineering via boron doping significantly improves RuO2 catalyst performance.
  • The B-O-Ru local structure enhances catalyst framework stability and prevents Ru overoxidation.
  • This approach offers a viable pathway for developing durable and high-performance Ru catalysts for PEMWE.