Au decorated hollow ZnO@ZnS heterostructure for enhanced photocatalytic hydrogen evolution: The insight into the roles of hollow channel and Au nanoparticles

Ma, Dandan; Shi, Jian‐Wen; Sun, Diankun; Zou, Yajun; Cheng, Lei; He, Chi; Wang, Hongkang; Niu, Chunming; Wang, Luyao

doi:10.1016/j.apcatb.2018.12.016

Cited by 156 publications

(48 citation statements)

References 53 publications

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“…TiO 2 /CdS solid microsphere, on the other hand, exhibited trifling activity (1.48 mmol.h −1 g −1 ), proving the advantage of hollow structures over the solid ones. Au nanoparticle (NPs)‐decorated ZnO@ZnS flower‐like hollow heterostructure was also reported recently by Ma et al . The ZnO@ZnS alone achieved 5.17 mmol.h −1 g −1 photocatalytic H 2 generation rate, which rose to 56.981 mmol.h −1 g −1 upon integrating Au NPs to the structure (AQE of 25.47% at 365 nm).…”

Section: Hollow Structured Metal Sulfides For Photocatalytic H2 Genersupporting

confidence: 71%

“…It has been proven that the coupling of two diﬀerent semiconductors (one active in the UV region while the other is active in the visible region) with fitting energy bandgaps and suitable band edges could create a hybrid material with heterojunction interface. The formation of heterojunction is highly beneficial towards the generation and separation of charge carriers and extension of light absorption, and increased density of active sites, which are significant factors to improve the photocatalytic activity . Meanwhile, a typical heterogeneous photocatalyst is composed of primary and secondary components, also known as semiconductor and cocatalyst, respectively.…”

Section: Fundamentals Of Metal Sulfidesmentioning

confidence: 99%

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Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

et al. 2020

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Metal sulfides (MSs) are a promising class of materials for photocatalytic hydrogen generation due to their distinct features of photosensitivity, electrical conductance, and photoelectrochemical stability. However, the photocatalytic activity of solid structured MSs is often compromised due to low incident photon absorption, high charge carrier recombination, inadequate catalytic active sites, and slow mass and charge diffusion. The development of hollow structured MSs alleviates these limitations and achieves higher H2 generation than solid structured counterparts. This minireview aims to review the recent advances in the development of synthetic methods for various hollow structured MSs that are designed to enhance light absorption and fasten mass diffusion. Particularly, this report highlights the advent of sophisticated heterostructured hollow MSs for the application in photocatalysis, in which the formation of heterojunction at the semiconductor interface ensures spatial separation of charge carriers. The synergy between the hollow structure and heterostructure dramatically increases the H2 generation rate by providing increased light absorption, delayed charge recombination, and accelerated mass diffusion. We also point to potentially fruitful research directions in this field, in hope that this minireview serves as a stepping stone for the future development in hollow MSs for photocatalytic applications and beyond.

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Section: Hollow Structured Metal Sulfides For Photocatalytic H2 Genersupporting

confidence: 71%

Section: Fundamentals Of Metal Sulfidesmentioning

confidence: 99%

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

et al. 2020

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“…Among the semiconductor based photocatalyst, ZnO and TiO 2 are widely used due to their strong oxidation capacity, chemical stability, non-toxicity, low cost etc. ZnO (3.37 eV) is one of the best alternate semiconductor material for TiO 2 (3.2 eV) as it has similar band gap energy and high quantum efficiency [6][7][8][9][10][11][12][13][14][15][16][17][18] .…”

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confidence: 99%

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Ganapathy

Harinee

Sridhar

et al. 2020

Sci Rep

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PbS heterojunction were prepared by microwave irradiation to improve the organic pollutants degradation under visible light irradiation. Hexagonal (wurtzite) and cubic crystal structure of ZnO and PbS respectively were confirmed by PXRD. Nano-plate, nano-sponge and nano-sponge imprinted over nano-sheet like morphology of ZnO, PbS and ZnO-PbS respectively were revealed through FESEM analysis. HR-TEM analysis provides the formation of heterojunction. XPS analysis shows the presence of the ZnO-PbS heterojunction. UV-Visible spectroscopy confirms the enhanced visible light response of Zno-pbS heterojunction than the bare Zno. the pL and eiS results indicate ZnO-PbS heterojunction exhibited lowest recombination of excitons and electron transfer resistance. Synergistic effect of ZnO-PbS heterojunction leads to efficient degradation against organic pollutants than bare ZnO and PbS. Aniline and formaldehyde were successfully degraded around 95% and 79% respectively, under solar light irradiation. As-prepared photocatalysts obeys pseudo first order reaction kinetics. HPLC analysis also confirms the successful mineralization of organic pollutants into water and co 2 .Lead sulfide (PbS) has broad spectral response form visible to near-IR region due to its narrow direct band gap (0.41 eV). In recent years, PbS sensitized nanomaterial's are increased the visible light response and photo-conversion efficiencies. It has unique photo physical properties such as multi exciton generation (MEG), high absorption coefficients, size dependent optical properties and optoelectronic properties 23,24 .Recently, several methods are adopted for the preparation of ZnO-PbS heterojunction such as chemical bath deposition 25 , ultrasound deposition method 26 , low temperature method 27 , successive Ionic Layer Adsorption and Desorption method 28,29 , Radio Frequency Sputtering 30 and spin coating method 31 . In all the above methods, most of them have some difficulties and limitations to produce ZnO-PbS heterojunction such as long reaction time and cost of the equipment. Therefore, novel techniques required to overcome this problem to prepare the semiconductor coupled ZnO-PbS photocatalyst in large-scale production without any sacrification in efficiency.Microwave irradiation technique is a best alternative heating source for the preparation of nano materials due to its rapid chemical reaction with short span of time when compared to conventional methods. Microwave irradiation involves through dipolar polarization and ionic conduction, which helps for the preparation of nanostructured materials 32 . Microwave method is fast, uniform heat distribution, energy efficient and simple than other conventional methods. The size and morphology of the material can be easily controlled by the microwave parameters such as frequency, time and operating power. Therefore, microwave method is leading technique for homogeneous nucleation and fast crystallization, which leads to the preparation of nano-structured inorganic semiconductor photocatalyst. In recent ...

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“…NiS/ZnOS–15 still maintained the rod‐like morphology (Figure d), and the nanorod featured a rough surface and a jagged edge, which was conducive to provide abundant active sites. The d spacings of 0.26, 0.201, and 0.312 nm in high‐resolution transmission electron microscopy (HRTEM, Figure e) images were assigned to the (002) plane of ZnO, the (102) plane of NiS, and (111) plane of ZnS, respectively, suggesting that the three ingredients were in close contact with each other . Furthermore, TEM–energy‐dispersive X–ray spectroscopy (EDX) mapping clearly showed the uniform distribution of Zn (Figure f), Ni (Figure g), O (Figure h), and S (Figure i) elements, which demonstrated that the ZnO and NiO were vulcanized synchronously.…”

Section: Resultsmentioning

confidence: 94%

“…36–1451), whereas NiO corresponded well to the bunsenite NiO (JCPDS no. 47–1049) . For the NiO/ZnO– x samples, the typical diffraction peaks at 2 θ = 31.8°, 34.4°, 36.2°, 47.5°, 56.6°, 62.9°, 67.9°, and 69.1° could be indexed to the (100), (002), (101), (102), (110), (103), (112), and (201) reflections of ZnO, whereas the reflections at 2 θ = 37.2°, 43.3°, 62.0°, 75.4°, and 79.4° were characterized for the (111), (200), (220), (311), and (222) lattice planes of NiO, which demonstrated the coresidency of these two ingredients with high purity.…”

Section: Resultsmentioning

confidence: 98%

NiS‐Decorated ZnO/ZnS Nanorod Heterostructures for Enhanced Photocatalytic Hydrogen Production: Insight into the Role of NiS

Zhang

Xiao

et al. 2020

Solar RRL

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Loading cocatalysts can effectively enhance the surface hydrogen reduction in photocatalytic water splitting by introducing a positive Schottky barrier. NiS is regarded as a promising cocatalyst to replace the noble metals due to its low cost and equivalent or even better performance. However, there is a huge controversy over whether the NiS cocatalyst is used to trap electrons or holes in the photocatalytic process. Herein, a new type of NiS‐decorated ZnO/ZnS (ZnOS) nanorod heterostructure photocatalysts is first designed from the corresponding bimetallic organic frameworks (ZnNi–MOFs). The Zn species in the bimetallic–MOFs can spatially separate the Ni species to restrain their aggregation, which is beneficial for the formation of NiS with a small enough size. The optimal heterostructure photocatalysts exhibit an excellent hydrogen production rate of 27 mmol g−1 h−1, which is about seven times higher than that of the ZnOS heterostructure. X‐ray photoelectron spectroscopy and open‐circuit potential characterizations disclose that NiS can effectively facilitate the migration of the electrons. Density functional theory calculations, including differential charge density, Mulliken population analyses, and d‐band center, intuitively reveal that the real role of NiS in the photocatalytic process is to capture the electrons rather than the holes.

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Au decorated hollow ZnO@ZnS heterostructure for enhanced photocatalytic hydrogen evolution: The insight into the roles of hollow channel and Au nanoparticles

Cited by 156 publications

References 53 publications

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

NiS‐Decorated ZnO/ZnS Nanorod Heterostructures for Enhanced Photocatalytic Hydrogen Production: Insight into the Role of NiS

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