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Black N/H‐TiO 2 Nanoplates with a Flower‐Like Hierarchical Architecture for Photocatalytic Hydrogen Evolution
Author(s) -
Zhang Kaifu,
Zhou Wei,
Chi Lina,
Zhang Xiangcheng,
Hu Weiyao,
Jiang Baojiang,
Pan Kai,
Tian Guohui,
Jiang Zheng
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201600854
Subject(s) - photocatalysis , anatase , materials science , hydrothermal circulation , nitrogen , nitriding , chemical engineering , hydrogen , oxygen evolution , doping , band gap , nanotechnology , catalysis , chemistry , organic chemistry , layer (electronics) , optoelectronics , electrode , engineering , electrochemistry
A facile two‐step strategy was used to prepare black of hydrogenated/nitrogen‐doped TiO 2 nanoplates (NHTA) with a flower‐like hierarchical architecture. In situ nitriding and self‐assembly was realized by hydrothermal synthesis using tripolycyanamide as a N source and as a structure‐directing agent. After thorough characterization, it was found that the hydrogenation treatment did not damage the flower‐like architecture but distorted the anatase crystal structure and significantly changed the band structure of NHTA owing to the increased concentration of oxygen vacancies, hydroxyl groups, and Ti 3+ cations. Under AM 1.5 illumination, the photocatalytic H 2 evolution rate on the black NHTA was approximately 1500 μmol g −1 h −1 , which was much better than the N‐doped TiO 2 nanoplates (≈690 μmol g −1 h −1 ). This improvement in the hydrogen evolution rate was attributed to a reduced bandgap, enhanced separation of the photogenerated charge carriers, and an increase in the surface‐active sites.