【摘 要】
：
To realize highly efficient hydrogen production of graphene-based photocatalysts,it is greatly important to increase more interfacial active sites onto graphene.In this work,the highly efficient CoSx-rGO(reduced graphene oxide)/TiO2 composite photocatalys
【机 构】
：
School of Chemistry,Chemical Engineering and Life Sciences,Wuhan University of Technology,Wuhan 4300
论文部分内容阅读
To realize highly efficient hydrogen production of graphene-based photocatalysts,it is greatly important to increase more interfacial active sites onto graphene.In this work,the highly efficient CoSx-rGO(reduced graphene oxide)/TiO2 composite photocatalyst was synthesized via a simple two-step method,including the hydrothermal loading of rGO nanosheets onto TiO2 nanoparticles and the subsequent photodeposition process of CoSx nanodots(0.5-2 nm)on the rGO nanosheets.Photocatalytic experi-mental results confirmed that the CoSx-rGO/TiO2 photo-catalyst displayed a distinctly higher photocatalytic H2-evolution activity than the TiO2 photocatalyst.The highest hydrogen-production efficiency of obtained CoSx-rGO/TiO2(10％)achieved 256.97 μmol·h-1,which was dis-tinctly higher than that of TiO2(4.41 μmol·h-1),rGO/TiO2(20.19 μmol·h-1)and CoSx/TiO2(132.67 μmol·h-1).According to the results of various characterizations and tests,the synergistic-effect mechanism of CoSx nanodots and rGO nanosheets is proposed to explain the increased photocatalytic performance of CoSx-rGO/TiO2 photocatalytic material,namely the rGO nanosheets cause the quick transfer of photo-induced carriers from TiO2 to CoSx nanodots,and then CoSx nanodots work as hydrogen-production active sites to quickly generate H2.The present study may offer innovative ideas for the preparation and application of new highly efficient and inexpensive pho-tocatalytic materials.
其他文献
TiO2-based materials have been considered as one of most promising alternatives for high-performance Li(Na)-ion batteries because of the low cost,simple com-position,easy synthesis,good environmental protection,excellent safety and relatively high specifi
Biomedical metallic materials are commonly used in the repair and replacement of human tissues.After the materials are implanted in the human body,the implants can rub against human tissue or other implants,resulting in wear and tear of the implants.The w
Manganese oxides(MnOx)have been exten-sively investigated due to their extremely high theoretical capacities for application as conversion anodes in lithium-ion batteries.However,fully performing their theoretical performance still faces poor electric con
Recently,researchers have focused on design-ing and fabricating highly efficient catalysts for photocat-alytic organic pollutant removal.Herein,CeO2 hollow spheres were prepared through a simple template method followed by calcination at different tempera
In this paper,a series of Sb-doped and Bi-doped Cu2Sn1-xMxSe3 samples(M = Sb,Bi)are prepared by vacuum melting combined with the spark plasma sintering process.The effects of different atomic doping amounts on their properties are discussed.Structural stu
Hot corrosion behavior of Sm2(Co,Fe,Cu,Zr)17-type high-temperature magnetic alloy without and with a protective coating of Ni and Ni/Cr bilayer at 500℃ in a corrosive mixture of 75 wt％Na2SO4-NaCl for 100 h was reported in this paper.The obtained results o
Although iron oxide(Fe3O4)nanoparticles have broad application prospects as magnetic resonance imaging(MRI)contrast agent,their biocompatibility and biotoxicity still need to be improved.In this study,we prepared Fe3O4@Angelica sinensis polysaccharide nan
BiTe is a potentially attractive candidate for thermoelectric applications because it is the structural analogue of the state-of-the-art thermoelectric material,bismuth telluride(Bi2Te3).However,BiTe has attracted little attention due to its small band ga
The complete decomposition of formaldehyde(HCHO)at ambient temperature is the most potential strategy for HCHO elimination from indoor environment.Herein,extra low content of Pt nanoparticles(0.025 wt％)supported on water-solubility carbon nitride/ceria(Pt
In this paper,biocarbon was prepared from corn husks as anode materials for potassium ion batteries at temperatures ranging from 700 to 1600℃.The prepared biocarbon materials have amorphous phase structure and possess larger interlayer spacing than graphi