Enhanced cyclability of CdS/TiO2 photocatalyst by stable interface structure

He, Dingyong; Chen, Mindong; Teng, Fei; Li, Guiqing; Shi, Huaxia; Wang, Jun; Xu, Mengjiao; Lu, Tianyun; Ji, Xuequn; Lv, Yingjie; Zhu, Yongfa

doi:10.1016/j.spmi.2012.03.026

Cited by 31 publications

(17 citation statements)

References 49 publications

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“…Hydrogen has long been considered to be a primary energy carrier in future, because the chemical energy stored in the H–H bond of H 2 is very high, with an energy density of 140 MJ Kg −1 , and can be easily released when it reacts with oxygen (O 2 ), yielding only water without any pollution . Industrially, H 2 is generated from non‐renewable natural gas and petroleum by steam reforming processes, which consume fossil fuels, along with unwanted CO 2 emission .…”

Section: Photocatalytic Applicationsmentioning

confidence: 99%

CdS/Graphene Nanocomposite Photocatalysts

Wageh

et al. 2015

Advanced Energy Materials

757

355

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Heterogeneous photocatalysis using semiconductors and renewable solar energy has been regarded as one of the most promising processes to alleviate, and even solve, both the world crises of energy supply and environmental pollution. In the past few years, many encouraging achievements have been made in the research area of graphene-based semiconductor photocatalysts. Among them, CdS/graphene nanocomposites have attracted extensive attention as an important kind of photocatalyst in chemical and material science, due to its superior photocatalytic activity and photostability under visible-light irradiation. The aim here is to address the enhancement mechanism of the photocatalytic performance of CdS/graphene composite photocatalysts, and systematically summarize recent progress regarding the design and synthesis of CdS/graphene nanocomposites. These nanocomposites are promising for a great diversity of applications in visible-light photocatalytic fi elds, including artifi cial photosynthetic systems (photocatalytic hydrogen production and CO 2 reduction), environmental remediation, and organic photosynthesis. Special attention is given to the photocatalytic hydrogen production and pollutant photodegradation over CdS/graphene nanocomposite photocatalysts. Furthermore, perspectives on CdS/graphene-based materials are discussed, including the various remaining challenges for large-scale applications, identifying prospective areas for related research in this fi eld.

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Section: Photocatalytic Applicationsmentioning

confidence: 99%

CdS/Graphene Nanocomposite Photocatalysts

Wageh

et al. 2015

Advanced Energy Materials

757

355

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“…The diffraction peaks for TiO 2 can be indexed to wurtzite structure (JCPDS card no 80-0075) [16]. Beside these peaks, the additional peaks at 2θ 9 values of 26.5º, 30.6º, and 52.1º corresponding to the crystal plane (111), (200), and (311) indicate the presence of CdS NPs [20,21]. We did not observe separate peak for RGO in the composite nanostructure, which may be due to the low amount of utilized GO and relatively low diffraction intensity of RGO as compared to the main peak of anatase at around 25º.…”

Section: Resultsmentioning

confidence: 99%

One-pot synthesis of CdS sensitized TiO2 decorated reduced graphene oxide nanosheets for the hydrolysis of ammonia-borane and the effective removal of organic pollutant from water

Pant

Park

et al. 2016

Ceramics International

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“…39 In the case of direct deposition by in situ CdS-ZnS QDs synthesis in the presence of TiO 2 , QDs were observed agglomerated as seen in Fig. 40 With a closer look at these nanowires ( Fig. There was also a decrease in nanowire length observed because of vigorous stirring under high temperature during pyrolysis of the QD precursor.…”

Section: Morphology and Structural Characteristicsmentioning

confidence: 96%

Supercritical CO₂ synthesized TiO₂ nanowires covalently linked with core–shell CdS–ZnS quantum dots: enhanced photocatalysis and stability

2015

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Semiconductor quantum dots (QDs) sensitized onto nano TiO 2 as heterogeneous photocatalysts have drawn considerable interest over the past few years. However, stability of the QDs attached to TiO 2 and consistent photocatalysis are still major challenges of this approach. We describe herein, a facile process to fabricate nanocomposites from porous TiO 2 nanowires and bare CdS and core-shell CdS-ZnS QDs, where the QD particles are linked covalently to the titania surface through a bifunctional organic linker, mercapto propionic acid (MPA). A thin layer of ZnS was grown on 6 nm CdS QDs to restrain the photocorrosion and passivate the trap states, enhancing the photoluminescence and quantum yield. The bifunctional linking molecule, MPA, was found to effectively disperse and stabilize the QD nanoparticles.The photocatalytic activities of the prepared catalysts were evaluated under ultraviolet and visible light solar irradiation for the photodegradation of methylene blue (MB), an organic dye. The decomposition rate of MB was enhanced as follows: CdSZnS-MPA-TiO 2 > CdS-MPA-TiO 2 > CdSZnS-TiO 2 > CdS-TiO 2 > TiO 2 > P25. A maximum photodegradation efficiency of MB dye ($88%) was obtained by core-shell CdS-ZnS QDs linked with nano TiO 2 . After 3 cycling tests of degradation, the loss of photoactivity was significantly minimized (from 68% to 10%) by CdSZnS-MPA-TiO 2 compared to CdSZnS-TiO 2 (by direct deposition).Scheme 1 Schematic illustration of (step 1) chemical reactions of bare CdS and core-shell CdS-ZnS QDs from single molecule precursors, (step 2) TiO 2 nanowires formation in scCO 2 using sol-gel method, and (step 3) functionalization of TiO 2 nanowires and covalent linking with QDs.This journal is

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Enhanced cyclability of CdS/TiO2 photocatalyst by stable interface structure

Cited by 31 publications

References 49 publications

CdS/Graphene Nanocomposite Photocatalysts

CdS/Graphene Nanocomposite Photocatalysts

One-pot synthesis of CdS sensitized TiO2 decorated reduced graphene oxide nanosheets for the hydrolysis of ammonia-borane and the effective removal of organic pollutant from water

Supercritical CO₂ synthesized TiO₂ nanowires covalently linked with core–shell CdS–ZnS quantum dots: enhanced photocatalysis and stability

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Enhanced cyclability of CdS/TiO2 photocatalyst by stable interface structure

Cited by 31 publications

References 49 publications

CdS/Graphene Nanocomposite Photocatalysts

CdS/Graphene Nanocomposite Photocatalysts

One-pot synthesis of CdS sensitized TiO2 decorated reduced graphene oxide nanosheets for the hydrolysis of ammonia-borane and the effective removal of organic pollutant from water

Supercritical CO2 synthesized TiO2 nanowires covalently linked with core–shell CdS–ZnS quantum dots: enhanced photocatalysis and stability

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Supercritical CO₂ synthesized TiO₂ nanowires covalently linked with core–shell CdS–ZnS quantum dots: enhanced photocatalysis and stability