Citation: Heng Wang, Xiantao Hu, Yajuan Ma, Dajian Zhu, Tao Li, Jingyu Wang. Nitrate-group-grafting-induced assembly of rutile TiO₂ nanobundles for enhanced photocatalytic hydrogen evolution[J]. Chinese Journal of Catalysis, ;2020, 41(1): 95-102. doi: S1872-2067(19)63452-2 shu

Nitrate-group-grafting-induced assembly of rutile TiO₂ nanobundles for enhanced photocatalytic hydrogen evolution

Key Laboratory of Materials Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China

Received Date: 17 June 2019
Revised Date: 12 July 2019

Fund Project: This study was supported by the National Natural Science Foundation of China (21771070, 21571071) and the Fundamental Research Funds for the Central Universities (2018KFYYXJJ120, 2019KFYRCPY104).

In this study, an acid-induced assembly strategy for a rutile TiO₂ photocatalyst was proposed on the basis of the treatment of lamellar protonated titanate with a concentrated HNO₃ solution. Nitrate groups were successfully grafted onto a TiO₂ surface and induced the assembly of rutile TiO₂ nanorods into uniform spindle-like nanobundles. The resulting TiO₂ product achieved a photocatalytic hydrogen evolution rate of 402.4 μmol h^-1, which is 3.1 times higher than that of Degussa P25-TiO₂. It was demonstrated that nitrate group grafting caused the rutile TiO₂ surface to become negatively charged, which is favorable for trapping positive protons and improving charge carrier separation, thereby enhancing photocatalytic hydrogen production. Additionally, surface charges were crucial to structural stability based on electrostatic repulsion. This study not only developed a facile surface modification strategy for fabricating efficient H₂ production photocatalysts but also identified an influence mechanism of inorganic acids different from that reported in the literature.
- Acid modification,
- Rutile TiO₂,
- Surface grafting,
- H₂ production,
- Photocatalysis
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Nitrate-group-grafting-induced assembly of rutile TiO2 nanobundles for enhanced photocatalytic hydrogen evolution

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Nitrate-group-grafting-induced assembly of rutile TiO₂ nanobundles for enhanced photocatalytic hydrogen evolution