Unveiling localized Pt–P–N bonding states constructed on covalent triazine-based frameworks for boosting photocatalytic hydrogen evolution
| Autor: | Xun-Heng Jiang, Shao-Lin Wu, Ling-Ling Zheng, Dengke Wang, Shenglian Luo, Jun Zhang, Jian-Ping Zou, Qiu-Ju Xing |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Chemical substance Hydrogen Renewable Energy Sustainability and the Environment Doping chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Magazine Covalent bond law Photocatalysis Physical chemistry General Materials Science 0210 nano-technology Science technology and society Triazine |
| Zdroj: | Journal of Materials Chemistry A. 8:25425-25430 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Developing highly efficient and stable photocatalysts for hydrogen (H2) evolution is a great challenge. Herein, a novel strategy using ultrathin black phosphorus (BP) as a bridge joint was proposed for controllable construction of a sandwich-type Pt-containing covalent triazine-based framework photocatalyst, CTF-BP-Pt. The as-prepared CTF-BP-Pt not only significantly enhances the stability of Pt nanoparticles but also dramatically improves the charge separation efficiency of the photocatalyst. For the first time, this work reveals that the unique Pt(δ+)–P(δ−)–N(δ+) surface bonding states in CTF-BP-Pt lead to a greatly improved H2 evolution rate (614.6 μmol g−1 h−1) compared with that of CTF directly doped with Pt (CTF/Pt, 167.5 μmol g−1 h−1). In addition, the Pt(δ+)–P(δ−)–N(δ+) configurations enabled the reduction of loading amount of Pt from the normal 2 wt% to 0.05 wt% but did not remarkably decrease the H2 evolution rate. It is noteworthy that the H2 evolution rate and its turnover frequency (TOF) obtained over the CTF-BP-Pt with 0.05 wt% Pt are much higher than those of other Pt loaded carbonaceous materials. Finally, the improvement of photocatalytic performance of CTF-BP-Pt was well explained based on many characterization experiments. The present work marks a critical step toward developing high-performance and low-cost photocatalytic H2 evolution materials. |
| Databáze: | OpenAIRE |
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