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Self-Standing Mo/MoO2 Porous Flake Arrays for Efficient Hydrogen Evolution Reaction in High-pH Media.

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Summary

Researchers developed a Mo/MoO2 heterojunction catalyst that enhances the hydrogen evolution reaction (HER) in alkaline solutions by creating a proton-rich surface. This breakthrough improves HER kinetics and catalyst performance for sustainable hydrogen production.

Keywords:
Mo/MoO2alkaline hydrogen evolution reactionhigh current densitylocal acidic environmentporous flake array structure

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The alkaline hydrogen evolution reaction (HER) is hindered by limited proton availability, leading to slower kinetics compared to acidic conditions.
  • Improving the local proton environment on catalyst surfaces is crucial for enhancing intrinsic HER kinetics.

Purpose of the Study:

  • To design a Mo/MoO2 metallic heterojunction catalyst for enhanced HER performance in alkaline electrolytes.
  • To create an acidic-like, proton-rich surface environment on the catalyst.

Main Methods:

  • Fabrication of a self-standing Mo/MoO2 catalytic electrode using a controlled pyrolysis-reduction strategy.
  • Electrochemical analysis and in situ spectroscopy to confirm enhanced HER activity and understand the catalytic mechanism.

Main Results:

  • The Mo/MoO2 electrode exhibited exceptional HER activity with low overpotentials (65 mV at 10 mA cm-2) and a Tafel slope of 38.2 mV dec-1.
  • The catalyst demonstrated excellent stability (>60 h at -300 mA cm-2) in alkaline solution.
  • The porous structure enhanced hydronium concentration, lowering the hydrogen adsorption free energy (ΔGH*) to 0.15 eV and water dissociation barrier to 0.37 eV.

Conclusions:

  • The Mo/MoO2 heterojunction effectively creates an acidic-like environment, significantly boosting HER performance in alkaline media.
  • The scalable fabrication of large-area electrodes (2 cm × 2 cm) highlights the practical applicability of this approach for molybdenum-based HER catalysts.