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Photocatalysts for H 2 Generation from Starburst Triphenylamine/Carbazole Donor‐Based Metal‐Free Dyes and Porous Anatase TiO 2 Cube
Author(s) -
Huang JianFeng,
Lei Yang,
Xiao LiMin,
Chen XinLun,
Zhong YuHui,
Qin Su,
Liu JunMin
Publication year - 2020
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.201902742
Subject(s) - photocatalysis , anatase , triphenylamine , materials science , catalysis , mesoporous material , visible spectrum , carbazole , photochemistry , chemical engineering , chemistry , organic chemistry , polymer chemistry , optoelectronics , engineering
Abstract A series of novel triphenylamine/carbazole‐based D–D–π–π–A dyes DH1–4 and a mesoporous anatase cubic “microcage” TiO 2 material (denoted as MC‐TiO 2 ) were synthesized and combined to obtain dye‐sensitized photocatalysts (denoted as DH n /Pt/MC‐TiO 2 , n =1–4). These catalysts showed better performances in visible‐light‐driven H 2 evolution from water than DH n /Pt/P25‐TiO 2 catalysts based on commercial P25‐TiO 2 bulk semiconductor under similar conditions. Compared with P25‐TiO 2 particles, the porous MC‐TiO 2 had a large Brunauer–Emmett–Teller surface area, porosity, and exposed {0 0 1} crystal plane, which greatly contributed to the photocatalytic activity. The optimized DH2/Pt/MC‐TiO 2 photocatalyst exhibited an attractive H 2 production rate (16.28 mmol g −1 h −1 based on catalyst mass), and the optimized DH4/Pt/MC‐TiO 2 photocatalyst showed good stability [turnover number (TON) of 16 699 in 105 h based on dye number], which represents one of the best performances among all reported visible‐light‐driven heterogeneous catalytic systems. Compared with the other dyes in this series, the high H 2 production rate of DH2 on Pt/MC‐TiO 2 can be attributed to its size‐matching effect and thus high dye loading amount, whereas the high TON and durability of DH4/Pt/MC‐TiO 2 are probably related to the rapid regeneration kinetics of DH4.