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Tunable Pt-MoS x Hybrid Catalysts for Hydrogen Evolution.
Xinyi Chia1, Nur Ayu Afira Sutrisnoh1, Martin Pumera1,2
1Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences , Nanyang Technological University , Singapore 637371 , Singapore.
ACS Applied Materials & Interfaces
|March 6, 2018
Summary
Platinum-molybdenum disulfide (Pt-MoSx) composites were synthesized for efficient hydrogen evolution reaction (HER) catalysis. These novel electrocatalysts demonstrate performance comparable to platinum, offering a cost-effective alternative for water splitting.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum (Pt)-based materials are highly effective electrocatalysts for the hydrogen evolution reaction (HER).
- Molybdenum disulfide (MoS2) has shown theoretical promise as a Pt alternative for HER, but practical applications remain limited.
- Developing cost-effective and high-performance electrocatalysts is crucial for water splitting technologies.
Purpose of the Study:
- To develop a facile synthesis method for Pt-MoSx composites.
- To investigate the electrocatalytic performance of Pt-MoSx hybrids for HER.
- To compare the HER kinetics and mechanisms of Pt-MoSx composites with pure MoS2 and Pt.
Main Methods:
- One-pot bottom-up synthesis via electrochemical reduction.
- Fabrication of Pt-MoSx composites with varying Pt precursor concentrations.
- Electrochemical characterization including overpotential and Tafel slope measurements.
- Analysis of the rate-limiting step in the HER mechanism.
Main Results:
- Pt-MoSx composites were successfully synthesized under ambient conditions.
- All fabricated Pt-MoSx hybrids exhibited superior HER performance compared to MoS2.
- The HER mechanism on Pt-MoSx hybrids was dominated by Heyrovsky desorption, similar to Pt.
- Pt1.8MoS2 and Pt0.1MoS2.5 showed catalytic performance closely mirroring electrodeposited Pt.
Conclusions:
- Electrochemical synthesis offers a cost-effective route for designing advanced electrocatalysts.
- Pt-MoSx composites are promising candidates for efficient HER catalysis in water splitting.
- This study presents a viable strategy for fabricating high-performance composite materials for sustainable energy applications.
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