1. 武汉大学深圳研究院, 中国深圳518057 2. 武汉大学 化学与分子科学学院, 中国武汉430072 3. Research Institute of Wuhan University in Shenzhen, Shenzhen 518057, China; College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
In situ grown TiN/N-TiO2 composite for enhanced photocatalytic H2 evolution activity
1. Research Institute of Wuhan University in Shenzhen, Shenzhen 518057, China 2. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China 3. Research Institute of Wuhan University in Shenzhen, Shenzhen 518057, China; College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Titanium nitride (TiN) decorated N-doped titania (N-TiO2) composite (TiN/N-TiO2) is fabricated via an in situ nitridation using a hydrothermally synthesized TiO2 and melamine (MA) as raw materials. After the optimization of the reaction condition, the resultant TiN/N-TiO2 composite delivers a hydrogen evolution activity of up to 703 μmol/h under the full spectrum irradiation of Xe-lamp, which is approximately 2.6 and 32.0 times more than that of TiO2 and TiN alone, respectively. To explore the underlying photocatalytic mechanism, the crystal phase, morphology, light absorption, energy band structure, element composition, and electrochemical behavior of the composite material are characterized and analyzed. The results indicate that the superior activity is mainly caused by the in situ formation of plasmonic TiN and N-TiO2 with intimate interface contact, which not only extends the spectral response range, but also accelerates the transfer and separation of the photoexcited hot charge carrier of TiN. The present study provides a fascinating approach to in situ forming nonmetallic plasmonic material/N-doped TiO2 composite photocatalysts for high-efficiency water splitting.
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