Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 279, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119403
Keywords
Ag doping; Density functional theory; photocatalytic hydrogen production; reduced graphene oxide; ZnIn2S4
Funding
- National Natural Science Foundation of China [NSFC 51402198, 21671139, 91961110]
- National key R&D program of China [2018YFF01011400]
- Scientific Research Foundation of the Education Department of Liaoning Province [LQ2019011]
- Key Task and Local Project in Science & Technology of SYUCT [LDB2019004]
- doctoral scientific foundation of Liaoning Province [20170520285]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization [RERU2019009]
- NSERC
- China Scholarship Council (CSC) [201506220152]
- FRQNT [258513]
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For the purpose of realizing effective visible-light-driven photocatalysis, Ag-doped ZnIn2S4 nanoplates were synthesized in situ onto reduced graphene oxide (RGO) sheets (denoted as Ag:ZnIn2S4/RGO). The high photocatalytic activity is predominantly attributed to the doping effect of Ag+ ions into ZnIn2S4 crystal structure. Interstitial and substitutional doping modes help introduce both acceptor and donor states, as supported by our calculations. Such a doping greatly increases the carrier density and charge transport efficiency. Meanwhile, there is a well-contacted interface between Ag:ZnIn2S4 nanoplates and RGO that renders RGO an electron collector and transporter to effectively lengthen the lifetime of the photogenerated charge carriers. As expected, the optimum nanocomposite exhibits a high H-2 -production rate of 6343.86 mu mol g(-1) h(-1), about 10.3 and 4.0 times higher than that of pure ZnIn2S4 and 0.15 wt% Ag:ZnIn2S4 samples, respectively. Similarly importantly, the photocatalysts exhibit long-term stability (>= 100 h) under visible light irradiation.
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