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Large-Scale Tunable 3D Self-Supporting WO3 Micro-Nano Architectures as Direct Photoanodes for Efficient
Mingyong Cai1, Peixun Fan1, Jiangyou Long1
1Laser Materials Processing Research Center, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
ACS Applied Materials & Interfaces
|May 10, 2017
Summary
Hierarchical 3D tungsten oxide (WO3) micro-nano architectures were fabricated for efficient photoelectrochemical (PEC) water splitting. This method offers a cost-effective route to enhance hydrogen production, addressing the energy crisis.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Photoelectrochemical (PEC) water splitting offers a sustainable route for hydrogen production.
- Developing efficient and stable photoanodes is crucial for advancing PEC technology.
- Tungsten oxide (WO3) is a promising material, but its efficiency often requires nanostructuring.
Purpose of the Study:
- To fabricate hierarchical 3D WO3 micro-nano architectures on tungsten (W) plates for enhanced PEC water splitting.
- To investigate the influence of laser processing and thermal oxidation on material structure and PEC performance.
- To establish a scalable and cost-effective method for producing advanced photoanode materials.
Main Methods:
- Fabrication of hierarchical 3D WO3 micro-nano architectures using ultrafast laser processing combined with thermal oxidation.
- In situ growth of WO3 on W plates to create self-supporting photoanodes.
- Characterization of the micro-nano architectures and evaluation of their PEC performance under AM 1.5 G illumination.
Main Results:
- Achieved a high photocurrent density of 1.2 mA cm-2 at 1.0 V vs Ag/AgCl (1.23 V vs RHE).
- Demonstrated excellent structural stability during long-term PEC water splitting.
- Showcased facile tunability of nanoscale and microscale features to optimize PEC activity.
Conclusions:
- The hierarchical 3D WO3 micro-nano architectures exhibit excellent PEC performance and stability.
- The hybrid laser processing and thermal oxidation method is simple, cost-effective, and scalable.
- This approach provides a general route to enhance the properties of metal oxides for energy applications.
