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Bipolar-Axis Intergrowth Ferroelectrics for Efficient and Stable Photocatalytic Overall Water Splitting
Pengwei Jia1, Fang Chen1, Xiaolei Zhang1
1Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, China.
We developed bipolar-axis intergrowth ferroelectrics (iBTN) for efficient photocatalytic overall water splitting (POWS). This material shows colossal polarization, enhancing carrier dynamics and catalysis for stable hydrogen and oxygen production.
Area of Science:
- Materials Science
- Photocatalysis
- Renewable Energy
Background:
- Ferroelectric semiconductors offer promise for photocatalytic overall water splitting (POWS).
- Achieving strong polarization in these materials for efficient POWS remains a significant challenge.
- Existing unipolar-axis ferroelectrics have limitations in maximizing photocatalytic performance.
Purpose of the Study:
- To develop novel bipolar-axis intergrowth ferroelectrics (iBTN) with enhanced polarization for efficient and stable POWS.
- To investigate the relationship between material structure, polarization, and photocatalytic activity.
- To demonstrate the practical potential of iBTN in solar water splitting.
Main Methods:
- Synthesis and characterization of bipolar-axis intergrowth ferroelectrics Bi7Ti4NbO21 (iBTN).
- Comparative analysis with conventional unipolar-axis ferroelectrics (Bi3TiNbO9, Bi4Ti3O12).
- Evaluation of photogenerated carrier dynamics, including exciton binding energy and effective mass.
- Assessment of POWS performance through H2 and O2 evolution rates and long-term outdoor testing.
Main Results:
- iBTN exhibits colossal orthogonal polarization (3793.53 D along a-axis, 106.39 D along c-axis).
- iBTN shows significantly reduced exciton binding energy (43.62 meV), ultra-low electron effective mass (0.010 m0), and high electron-hole effective mass ratio (400).
- Achieved state-of-the-art POWS rates (H2: 73.31 µmol·h⁻¹, O2: 37.34 µmol·h⁻¹) and stable 50-hour outdoor operation with 0.11% solar-to-hydrogen efficiency.
Conclusions:
- The development of bipolar-axis intergrowth ferroelectrics (iBTN) provides a new strategy for efficient photocatalytic overall water splitting.
- Ultra-strong orthogonal polarization in iBTN synergistically enhances carrier generation, separation, and transport, optimizing POWS.
- iBTN demonstrates significant practical potential for stable and efficient solar fuel production.
