Mechanochemically synthesized sub-5 nm sized CuS quantum dots with high visible-light-driven photocatalytic activity

Li, Shun; Ge, Zhen‐Hua; Zhang, Bo‐Ping; Yao, Yao; Wang, Huan‐Chün; Yang, Jing; Yan, Li; Gao, Chao; Lin, Yuanhua

doi:10.1016/j.apsusc.2016.05.034

Cited by 72 publications

(30 citation statements)

References 59 publications

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“…Three peaks at 2θ values of 25.9, 31.48 and 44.4 • corresponds to planes (120), (111) and (141) [45]. For CuS QDs peaks around 27.7, 29.3, 31.8, and 47.9 • can be assigned to the corresponding (100), (102), (103) and (110) crystal planes of CuS, which can be indexed as a hexagonal structure [46] (Figure 5c). The diffraction peaks that were matched to the orthorhombic structure of Bi 2 S 3 QDs can be observed ( Figure 5d) [47].…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

“…The optimal content of quantum dots for TiO 2 /CuS composites was 10 wt.%. After 1 h, 46 [59] reported that in case of CdSnO 3 -decorated CdS nanowire, for 2.5 at% of CdSnO 3 the highest charge carrier separation was observed. Generally, building the TiO 2 /AgInS 2 and TiO 2 /SnS composite resulted in a synergistic effect between QDs and TiO 2 matrix.…”

Section: Photocatalytic Activity In the Gas Phasementioning

confidence: 99%

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The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

et al. 2020

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The effect of type (AgInS 2 , SnS, CuS 2 , Bi 2 S 3 ) and amount (5, 10, 15 wt%) of quantum dots (QDs) on the surface properties and photocatalytic activity of QDs-sensitized TiO 2 composite, was investigated. AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were obtained by hot-injection, sonochemical, microwave, and hot-injection method, respectively. To characterize of as-prepared samples high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and photoluminescence (PL) emission spectroscopy were applied. The size of AgInS 2 , SnS, CuS 2 , Bi 2 S 3 QDs were 12; 2-6; 2-3, and 1-2 nm, respectively. The QDs and QDs-sensitized TiO 2 composites obtained have been tested in toluene degradation under LEDs light irradiation (λ max = 415 nm and λ max = 375 nm). For pristine QDs the efficiency of toluene degradation increased in the order of AgInS 2 < Bi 2 S 3 < CuS < SnS under 375 nm and AgInS 2 < CuS < Bi 2 S 3 < SnS under 415 nm. In the presence of TiO 2 /SnS QDs_15% composite, 91% of toluene was degraded after 1 h of irradiation, and this efficiency was about 12 higher than that for pristine QDs under 375 nm. Generally, building the TiO 2 /AgInS 2 and TiO 2 /SnS exhibited higher photoactivity under 375 nm than the pristine TiO 2 and QDs which suggests a synergistic effect between QDs and TiO 2 matrix. Catalysts 2020, 10, 403 2 of 18 application of metal sulfides (M x S y ) for wide band semiconductors modification, because of their high charge separation efficiency and narrow band gaps, which possibly enable light harvesting at longer wavelengths [9]. Liu et al. studied the efficiency of AgInS 2 /TiO 2 heterostructures in 1,2-dichlorobenzene (o-DCB) degradation under visible light [10]. They observed that AgInS 2 /TiO 2 composites could expand the visible-light response range and greatly decreased the recombination of photogenerated electron−hole pairs in the composites. The degradation of o-DCB for the most active sample reaches about 50% after 8h of irradiation. Jang et al. prepared Ag-SnS-TiO 2 nanocomposite for methylene blue and rhodamine B degradation under simulated sunlight [11].The photoactivity of the produced photocatalysts was about 2-3 times higher than that of P25. Compared with bare TiO 2 the CuS/TiO 2 [12], CdS/TiO 2 [13-15], SnS/TiO 2 [16], Ag 2 S/TiO 2 [17,18], CuInS 2 /TiO 2 [19-21], Bi 2 S 3 /TiO 2 [22][23][24] nanocomposites present a significant improvement on photocatalytic reactions due to the decreasing recombination of electron-hole pairs and the broadened light absorption spectra. However, the metal sulfides commonly employed for TiO 2 modification have been used in nanoparticle sizes and not in quantum dots sizes. Further, it has been shown that the size of metal sulfides (MS) particles can have an impact on its physicochemical and optical properties. Recently, the literature data demonstrated that the decrease in particle size lowers the recombination of the electron-hole pair within the semiconductor particle. Quantum...

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Section: Photoluminescence Propertiesmentioning

confidence: 99%

Section: Photocatalytic Activity In the Gas Phasementioning

confidence: 99%

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

et al. 2020

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“…Alternatively,i tc ould indicate the literature-known surface oxidation of Cu 2 Ot oC uO. [36,37] Thed econvoluted O1s spectrum indicates the presence of oxygen-metal bonds (O À Co,O À Cu, O À W) and hydroxyl groups (O À H). [37][38][39] In sum, this materials analysis suggests that amixed metal oxide phase is present containing crystalline Cu 2 Op articles together with amorphous,h ydrated copper, cobalt and tungsten oxide phases.T he exact structural properties of this complex system will be further explored using spectroscopic,magnetometric,diffractometric and theoretical methods in subsequent studies.…”

Section: Angewandte Chemiementioning

confidence: 99%

“…The observation of Cu + and Cu 2+ could indicate two distinct copper‐containing phases, for example, Cu 2 O and a Cu 2+ ‐containing (amorphous) metal oxide. Alternatively, it could indicate the literature‐known surface oxidation of Cu 2 O to CuO . The deconvoluted O1s spectrum indicates the presence of oxygen‐metal bonds (O−Co, O−Cu, O−W) and hydroxyl groups (O−H) .…”

Section: Figurementioning

confidence: 99%

“…X-ray photoelectron spectroscopy (XPS) was used to gain insight into the chemical nature of the metal species and confirmed the presence of Co 2+ ,C u +/2+ ,a nd W 6+ (Figure 3 and Figure S8). [36,37] Thed econvoluted O1s spectrum indicates the presence of oxygen-metal bonds (O À Co,O À Cu, O À W) and hydroxyl groups (O À H). Alternatively,i tc ould indicate the literature-known surface oxidation of Cu 2 Ot oC uO.…”

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Modular Design of Noble‐Metal‐Free Mixed Metal Oxide Electrocatalysts for Complete Water Splitting

et al. 2019

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Electrocatalytic water splitting into H 2 and O 2 is ak ey technology for carbon-neutral energy.H ere,w er eport am odular materials design leading to noble metal-free composite electrocatalysts,w hich combine high electrical conductivity,h igh OER and HER reactivity and high durability.T he scalable bottom-up fabrication allows the stable deposition of mixed metal oxide nanostructures with different functionalities on copper foam electrodes.T he composite catalyst shows sustained OER and HER activity in 0.1m aqueous KOHo verp rolonged periods (t > 10 h) at low overpotentials (OER: % 300 mV; HER: % 100 mV) and high faradaic efficiencies (OER: % 100 %, HER: % 98 %). The new synthetic concept will enable the development of multifunctional, mixed metal oxide composites as high-performance electrocatalysts for challenging energy conversion and storage reactions.Electrocatalytic water splitting into hydrogen and oxygen is one of the most promising catalytic approaches for carbonneutral energy storage. [1][2][3] Theoverall process is based on two coupled electrochemical half-reactions,the oxygen evolution reaction (OER) [4,5] and the hydrogen evolution reaction (HER). [2,6,7] Fori ndustrial relevance,b oth half-reactions require noble-metal-free catalysts,which combine high activity with long-term stability.T herefore,synthetic methods are required for the chemically,m echanically and electrically stable anchoring of high-performance catalysts on conductive electrode surfaces. [1,2,8] State-of-the-art electrocatalysis research has been focused on the independent development of HER and OER catalysts,sothat each half-reaction can be individually optimized. [1][2][3] ForH ER electrocatalysis, [9] the focus has been on homo-or heterometallic transition metal oxides, [10] sulfides, [11] nitrides, [12] carbides, [12] and phosphides. [13] ForO ER, [5] the leading electrocatalysts are homoand heterometallic transition metal oxides, [14,15] hydroxides, [16,17] phosphates, [18] and nitrides. [19] In contrast, the design of bifunctional catalysts capable of OER and HER electrocatalysis is still in its infancy and faces major challenges,asnew catalysts are needed, which feature the redoxchemistries,s tabilities and catalytic capabilities for reductive and oxidative proton-coupled electron transfers.H owever, the design of bifunctional OER/HER electrocatalysts offers vast advantages as it would simplify catalyst design and fabrication, prevent cross-contamination, materials incompatibilities and possible catalyst poisoning and is therefore of enormous technological interest. In addition, HER and OER electrocatalysis share common challenges including the need for high electrical conductivity,t he stable catalyst-electrode anchoring and others,s ot hat ac onvergent OER/HER catalyst design could overcome major current obstacles in electrocatalysis.T od ate,o nly few materials have shown this broad range of properties and most pioneering studies have used metal phosphides such as nickel phosphides, [20] iron nickel phosphides, [6] and ...

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Modular Design of Noble‐Metal‐Free Mixed Metal Oxide Electrocatalysts for Complete Water Splitting

et al. 2019

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Electrocatalytic water splitting into H2 and O2 is a key technology for carbon‐neutral energy. Here, we report a modular materials design leading to noble metal‐free composite electrocatalysts, which combine high electrical conductivity, high OER and HER reactivity and high durability. The scalable bottom‐up fabrication allows the stable deposition of mixed metal oxide nanostructures with different functionalities on copper foam electrodes. The composite catalyst shows sustained OER and HER activity in 0.1 m aqueous KOH over prolonged periods (t>10 h) at low overpotentials (OER: ≈300 mV; HER: ≈100 mV) and high faradaic efficiencies (OER: ≈100 %, HER: ≈98 %). The new synthetic concept will enable the development of multifunctional, mixed metal oxide composites as high‐performance electrocatalysts for challenging energy conversion and storage reactions.

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Mechanochemically synthesized sub-5 nm sized CuS quantum dots with high visible-light-driven photocatalytic activity

Cited by 72 publications

References 59 publications

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

The Effect of AgInS2, SnS, CuS2, Bi2S3 Quantum Dots on the Surface Properties and Photocatalytic Activity of QDs-Sensitized TiO2 Composite

Modular Design of Noble‐Metal‐Free Mixed Metal Oxide Electrocatalysts for Complete Water Splitting

Modular Design of Noble‐Metal‐Free Mixed Metal Oxide Electrocatalysts for Complete Water Splitting

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