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Ultrathin Hematite Photoanode with Gradient Ti Doping.
Pengfei Liu1, Chongwu Wang2, Lijie Wang1
1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
Gradient doping in hematite photoanodes significantly enhances photoelectrochemical performance by improving charge separation. This strategy offers a nearly 100% photocurrent increase, paving the way for advanced solar energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Hematite photoanodes suffer from poor photoelectrochemical (PEC) performance due to insufficient charge separation.
- Gradient doping is a promising strategy to improve charge transfer via band bending and built-in electric fields.
Purpose of the Study:
- To develop a gradient Ti-doped ultrathin hematite photoelectrode.
- To systematically investigate its PEC performance and charge transfer properties.
Main Methods:
- Fabrication of gradient Ti-doped hematite photoelectrodes with varying doping levels (1.5-6.0%).
- Systematic investigation of PEC performance using photocurrent measurements.
- Electrochemical measurements to confirm enhanced charge transfer properties.
Main Results:
- The gradient Ti-doped hematite photoelectrode achieved a photocurrent of approximately 1.30 mA cm⁻² at 1.23 V vs. RHE.
- This represents a nearly 100% improvement compared to homogeneously doped hematite.
- Enhanced charge transfer was confirmed, attributed to energy band bending induced by the built-in electric field.
Conclusions:
- Gradient doping is an effective strategy to enhance the PEC performance of hematite photoanodes.
- The developed method offers a significant improvement in photocurrent and charge transfer efficiency.
- This gradient doping approach is adaptable for other functional materials in various applications.
