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Modulated electrochemical oxygen evolution catalyzed by MoS2 nanoflakes from atomic layer deposition
Yazhou Huang1,2, Lei Liu1, Xiaolin Liu1
1Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, People's Republic of China.
Nanotechnology
|December 8, 2018
Summary
Molybdenum disulfide (MoS2) nanoflakes, synthesized using atomic layer deposition (ALD), show excellent catalytic activity for oxygen evolution reaction (OER). Plasma treatment further enhances this activity, offering a low-cost alternative to noble metals for clean energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrochemical water splitting is crucial for renewable energy, but noble metal catalysts (e.g., IrO2, RuO2) are expensive and scarce.
- Developing cost-effective and efficient catalysts is essential for large-scale hydrogen and oxygen production.
Purpose of the Study:
- To synthesize and evaluate molybdenum disulfide (MoS2) nanoflakes as a low-cost catalyst for the oxygen evolution reaction (OER).
- To investigate methods for enhancing the catalytic performance of MoS2 nanoflakes.
Main Methods:
- MoS2 nanoflakes were prepared on carbon fiber paper via atomic layer deposition (ALD) using MoCl5 and H2S.
- Electrochemical measurements were performed to assess catalytic activity.
- Plasma treatment was applied to further improve performance.
- Characterization included contact angle, electrochemical impedance spectroscopy (EIS), and electrochemically active surface area (ECSA) measurements.
Main Results:
- MoS2 nanoflakes exhibited excellent catalytic activity for OER.
- Catalytic performance was tunable by controlling MoS2 density and internal resistance.
- Plasma treatment significantly enhanced the OER activity of MoS2 nanoflakes.
- Analysis revealed improved surface properties and conductivity after plasma treatment.
Conclusions:
- ALD-synthesized MoS2 nanoflakes are a promising, low-cost catalyst for electrochemical OER.
- Controlling nanoflake morphology and applying plasma treatment are effective strategies to boost catalytic efficiency.
- MoS2 offers a viable alternative to expensive noble metal catalysts for water splitting applications.
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