TY - JOUR
T1 - A facile acid treatment for P25 modification with enhanced photocatalytic H2 evolution-effect of Brønsted acid sites and oxygen vacancies
AU - Lv, Chao
AU - Lan, Xuefang
AU - Li, Fuqiang
AU - Wang, Lili
AU - Xiao, Liqi
AU - Wang, Cheng
AU - Shi, Jinsheng
AU - Yu, Shuguang
N1 - Publisher Copyright:
This journal is © The Royal Society of Chemistry.
PY - 2020/2/7
Y1 - 2020/2/7
N2 - Acid treated P25 catalysts (HP25-x, x represents the treatment temperature) were successfully fabricated via a simple soaking and drying process for photocatalytic H2 production. After acid treatment, a substantial number of -OH groups were obtained on the surface of HP25-60, which can act as Brønsted acid sites providing hydrogen protons for H2 generation. Besides, more oxygen vacancies and Ti3+ sites were also created on the HP25-60 surface after acid treatment, which could enhance the carrier separation and transfer efficiency by capturing more electrons and holes, respectively. The H2 production over HP25-60 reached 4853 μmol h-1 with Pt as a co-catalyst, which is 7.1 times higher than 679 μmol h-1 of bare TiO2. Three favorable factors for H2 photogeneration, i.e. Brønsted acid sites, oxygen vacancies and Ti3+ sites, can be introduced on a catalyst surface via a simple one-step acid strategy, which can be applied as a universally-applicable modification method for valence-alternative metal oxide semiconductors for enhanced H2 photogeneration.
AB - Acid treated P25 catalysts (HP25-x, x represents the treatment temperature) were successfully fabricated via a simple soaking and drying process for photocatalytic H2 production. After acid treatment, a substantial number of -OH groups were obtained on the surface of HP25-60, which can act as Brønsted acid sites providing hydrogen protons for H2 generation. Besides, more oxygen vacancies and Ti3+ sites were also created on the HP25-60 surface after acid treatment, which could enhance the carrier separation and transfer efficiency by capturing more electrons and holes, respectively. The H2 production over HP25-60 reached 4853 μmol h-1 with Pt as a co-catalyst, which is 7.1 times higher than 679 μmol h-1 of bare TiO2. Three favorable factors for H2 photogeneration, i.e. Brønsted acid sites, oxygen vacancies and Ti3+ sites, can be introduced on a catalyst surface via a simple one-step acid strategy, which can be applied as a universally-applicable modification method for valence-alternative metal oxide semiconductors for enhanced H2 photogeneration.
UR - https://www.scopus.com/pages/publications/85079830161
U2 - 10.1039/c9cy02166c
DO - 10.1039/c9cy02166c
M3 - 文章
AN - SCOPUS:85079830161
SN - 2044-4753
VL - 10
SP - 690
EP - 699
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 3
ER -