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Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization
Hoa Thi Bui1, Nguyen Duc Lam1, Do Chi Linh1
1Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam.
Nanomaterials (Basel, Switzerland)
|July 29, 2023
Summary
This study developed a novel graphene-integrated molybdenum diselenide (MoSe2-Gr) composite for enhanced hydrogen evolution reaction (HER) catalysis. The new material significantly boosts efficiency and durability for green hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient and durable electrocatalysts for the hydrogen evolution reaction (HER) is critical for sustainable energy solutions.
- Molybdenum diselenide (MoSe2) shows promise for HER catalysis but suffers from layer stacking, reduced active sites, low conductivity, and poor electrical contact.
- Existing challenges limit the practical application of MoSe2 in large-scale hydrogen production.
Purpose of the Study:
- To engineer a novel MoSe2-based electrocatalyst with enhanced HER performance and stability.
- To overcome the limitations of stacked MoSe2 layers and improve electrical conductivity for efficient catalysis.
- To create a cost-effective and scalable method for producing advanced electrocatalysts for green hydrogen generation.
Main Methods:
- Synthesized a MoSe2-graphene (Gr) composite by incorporating diethylene glycol into MoSe2 interlayers during thermal treatment at 600 °C in an inert atmosphere.
- Investigated the structural changes, including widened interlayer spacing and increased exposure of active edge sites in MoSe2.
- Evaluated the electrochemical performance of the MoSe2-Gr composite for HER in an acidic medium, comparing it to pristine MoSe2 and commercial Pt/C catalysts.
Main Results:
- The in situ formed graphene within MoSe2 interlayers effectively widened the spacing, exposing more active edge sites.
- The MoSe2-Gr composite demonstrated significantly enhanced HER catalytic activity in acidic media compared to pristine MoSe2.
- The composite exhibited superior HER catalytic activity to the state-of-the-art Pt/C catalyst, especially at current densities above 55 mA cm-2, and showed excellent long-term electrochemical stability.
Conclusions:
- The facile synthesis of MoSe2-Gr composite effectively addresses the limitations of pristine MoSe2 for HER catalysis.
- The enhanced HER performance and stability make the MoSe2-Gr composite a promising candidate for efficient green hydrogen production.
- This approach offers a scalable and novel strategy for developing advanced electrocatalysts for renewable energy applications.
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