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Rationally Designed Mo/Ru-Based Multi-Site Heterogeneous Electrocatalyst for Accelerated Alkaline Hydrogen Evolution

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A novel Mo/Ru-based catalyst with three active sites accelerates alkaline hydrogen evolution reaction (HER) kinetics by facilitating water dissociation and hydrogen release. This multi-site catalyst demonstrates excellent performance and stability for efficient hydrogen production.

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high current densityhydrogen evolution reactionmulti‐site electrocatalyststheoretical calculation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Alkaline hydrogen evolution reaction (HER) kinetics are sluggish.
  • Developing multi-site electrocatalysts for efficient water splitting is challenging.

Purpose of the Study:

  • To design a Mo/Ru-based catalyst with three distinct active sites for alkaline HER.
  • To investigate the catalyst's mechanism for accelerating water dissociation, H-H coupling, and H2 release.

Main Methods:

  • Rational design of a Ru/Mo2C/MoO2 catalyst.
  • Electrochemical performance evaluation in alkaline media.
  • Density functional theory (DFT) calculations.

Main Results:

  • The catalyst exhibited synergistic effects at the Mo2C/MoO2 interface, enhancing water dissociation.
  • Interfacial Ru facilitated hydrogen binding, coupling, and release.
  • Achieved low overpotentials (19 mV at 10 mA cm−2) and high stability.

Conclusions:

  • The multi-site catalyst design principle effectively accelerates alkaline HER kinetics.
  • This approach offers a pathway for designing advanced catalysts for multi-electron reactions.
  • Demonstrated superior performance compared to state-of-the-art alkaline HER electrocatalysts.