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A novel triphase electrode using MoS2 nanosheets on a gas diffusion layer enhances electrocatalytic water splitting. This design suppresses bubble formation, significantly boosting hydrogen and oxygen evolution reaction efficiency and stability.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Bubble formation and adsorption on electrodes impede gas evolution reactions like HER and OER.
  • This inefficiency stems from hindered proton transfer and wasted nucleation energy.

Purpose of the Study:

  • To develop a triphase electrode to overcome bubble-related limitations in gas evolution reactions.
  • To enhance the efficiency and stability of electrocatalytic water splitting.

Main Methods:

  • Fabrication of a triphase electrode by immobilizing MoS2 nanosheets on a porous gas diffusion layer (GDL).
  • Implementation of reduced pressure behind the GDL to manage bubble evolution.
  • Electrocatalytic testing of the electrode for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).

Main Results:

  • The fabricated electrode demonstrated a superior HER and OER ratio with high current density and stability.
  • Reducing pressure behind the GDL significantly improved water-splitting rates, achieving three times higher current density compared to a bare MoS2 electrode.
  • Bubble elimination was achieved even at high current densities (100 mA cm-2), enhancing overall stability.

Conclusions:

  • The construction of a triphase system is crucial for efficient water splitting.
  • The developed electrode design offers a promising strategy for improving gas evolution reactions, applicable to both HER and OER, and potentially other gas-generating processes.