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Three-Dimensional Printed MoS2/Graphene Aerogel Electrodes for Hydrogen Evolution Reactions
Swetha Chandrasekaran1, Jeremy Feaster1, Jenna Ynzunza1
1Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
ACS Materials Au
|March 1, 2023
Summary
Direct ink writing (DIW) 3D printing creates robust, high-surface-area MoS2/graphene aerogel electrodes. These 3D printed electrodes show excellent catalytic activity for electrochemical applications like water splitting.
Area of Science:
- Materials Science
- Electrochemistry
- Additive Manufacturing
Background:
- Developing efficient electrodes is crucial for electrochemical applications.
- Traditional electrode fabrication methods can limit surface area and performance.
- 3D printing offers novel possibilities for creating advanced electrode architectures.
Purpose of the Study:
- To utilize direct ink writing (DIW) for fabricating 3D catalytic electrodes.
- To create hybrid Molybdenum disulfide (MoS2)/graphene aerogels for electrochemical applications.
- To evaluate the performance and durability of 3D printed electrodes.
Main Methods:
- Hybrid MoS2/graphene aerogels were synthesized using MoS2 and graphene oxide powders.
- A thixotropic ink was formulated for direct ink writing (DIW) 3D printing.
- Post-treatment involved freeze-drying and annealing for structural development and reduction.
Main Results:
- Characterization confirmed the composition and morphology (XPS, BET, SEM/EDS).
- 3D printed electrodes exhibited a high electrochemically active surface area (>1700 cm2).
- Electrodes achieved high currents (>100 mA) in acidic media with maintained catalytic activity.
Conclusions:
- DIW is a viable method for producing durable, high-surface-area electrodes.
- 3D printing enhances electrolyte dispersion, catalyst utilization, and electronic conductivity.
- The developed MoS2/graphene aerogel electrodes show promise for water splitting and other electrochemical applications.
