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Sulfur‐Doped Graphene Oxide Quantum Dots as Photocatalysts for Hydrogen Generation in the Aqueous Phase
Author(s) -
Gliniak Jacek,
Lin JiaHoa,
Chen YiTing,
Li ChuenRu,
Jokar Efat,
Chang ChinHao,
Peng ChunSheng,
Lin JuiNien,
Lien WanHsiang,
Tsai HuiMin,
Wu TungKung
Publication year - 2017
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.201700910
Subject(s) - graphene , oxide , photoluminescence , water splitting , quantum dot , materials science , hydrogen production , hydrogen , doping , photocatalysis , aqueous solution , photochemistry , analytical chemistry (journal) , chemistry , nanotechnology , optoelectronics , organic chemistry , metallurgy , catalysis
Sulfur‐doped graphene oxide quantum dots (S‐GOQDs) were synthesized and investigated for efficient photocatalytic hydrogen generation application. The UV/Vis, FTIR, and photoluminescence spectra of the synthesized S‐GOQDs exhibit three absorption bands at 333, 395, and 524 nm, characteristic of C=S and C−S stretching vibration signals at 1075 and 690 cm −1 , and two excitation‐wavelength‐independent emission signals with maxima at 451 and 520 nm, respectively, confirming the successful doping of S atom into the GOQDs. Electronic structural analysis suggested that the S‐GOQDs exhibit conduction band minimum (CBM) and valence band maximum (VBM) levels suitable for water splitting. Under direct sunlight irradiation, an initial rate of 18 166 μmol h −1 g −1 in pure water and 30 519 μmol h −1 g −1 in 80 % ethanol aqueous solution were obtained. Therefore, metal‐free and inexpensive S‐GOQDs hold great potential in the development of sustainable and environmentally friendly photocatalysts for efficient hydrogen generation from water splitting.