Enhanced photoelectrochemical and photocatalytic activities of CdS nanowires by surface modification with MoS2 nanosheets

Wang, Hongmei; Naghadeh, Sara Bonabi; Li, Chunhe; Lü, Ying; Allen, A’Lester C.; Zhang, Jin Z.

doi:10.1007/s40843-017-9172-x

Cited by 45 publications

(15 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The redshift of absorption edge is beneficial for utilizing the visible light. The bandgap energy ( E g ) can be calculated on the basis of the ultraviolet–visible diffuse reflectance spectra . The bandgap of In 2 O 3 –ZISe ultrathin nanosheets (inset of Figure d) is calculated to be about 2.73 eV, much narrower than that of In 2 O 3 (2.98 eV), being in agreement with the DFT calculation result.…”

supporting

confidence: 78%

Ultrathin Visible‐Light‐Driven Mo Incorporating In₂O₃–ZnIn₂Se₄ Z‐Scheme Nanosheet Photocatalysts

et al. 2018

View full text Add to dashboard Cite

Inspired by natural photosynthesis, the design of new Z‐scheme photocatalytic systems is very promising for boosting the photocatalytic performance of H2 production and CO2 reduction; however, until now, the direct synthesis of efficient Z‐scheme photocatalysts remains a grand challenge. Herein, it is demonstrated that an interesting Z‐scheme photocatalyst can be constructed by coupling In2O3 and ZnIn2Se4 semiconductors based on theoretical calculations. Experimentally, a class of ultrathin In2O3–ZnIn2Se4 (denoted as In2O3–ZISe) spontaneous Z‐scheme nanosheet photocatalysts for greatly enhancing photocatalytic H2 production is made. Furthermore, Mo atoms are incorporated in the Z‐scheme In2O3–ZISe nanosheet photocatalyst by forming the MoSe bond, confirmed by X‐ray photoelectron spectroscopy, in which the formed MoSe2 works as cocatalyst of the Z‐scheme photocatalyst. As a consequence, such a unique structure of In2O3–ZISe–Mo makes it exhibit 21.7 and 232.6 times higher photocatalytic H2 evolution activity than those of In2O3–ZnIn2Se4 and In2O3 nanosheets, respectively. Moreover, In2O3–ZISe–Mo is also very stable for photocatalytic H2 production by showing almost no activity decay for 16 h test. Ultraviolet–visible diffuse reflectance spectra, photoluminescence spectroscopy, transient photocurrent spectra, and electrochemical impedance spectroscopy reveal that the enhanced photocatalytic performance of In2O3–ZISe–Mo is mainly attributed to its widened photoresponse range and effective carrier separation because of its special structure.

show abstract

supporting

confidence: 78%

Ultrathin Visible‐Light‐Driven Mo Incorporating In₂O₃–ZnIn₂Se₄ Z‐Scheme Nanosheet Photocatalysts

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The CdS@MoS 2 heterostructure demonstrated an excellent hydrogen production rate of 9033 μmol g −1 h −1 with 1.0 mmol of benzyl alcohol. Compared with previous reports [15,[40][41][42][43][44] (Table S1), CdS@MoS 2 has a relatively high photocatalytic activity, which is mainly due to the formation of Recycling tests were carried out to explore the stability of the CdS@MoS 2 composite. Although the photocatalytic activity of the CdS@MoS 2 photocatalyst decreased after five cycles, it was still much higher than that of bare CdS nanorods (Fig.…”

Section: Photocatalytic Activity Of the Cds@mos 2 Photocatalystmentioning

confidence: 89%

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

Zhao

Yan

et al. 2020

Sci. China Mater.

View full text Add to dashboard Cite

Photocatalytic hydrogen production coupled with selective oxidation of organic substrates to produce highvalue-added fine chemicals has drawn increasing attention. Herein, we report a noble metal-free photocatalyst for the highly efficient and simultaneous generation of hydrogen and the selective oxidation of benzyl alcohol into benzaldehyde over CdS@MoS 2 heterostructures under visible light. Without the need for a sacrificial agent, CdS@MoS 2 displayed an excellent hydrogen production rate of 4233 μmol g −1 h −1 with 0.3 mmol benzyl alcohol, which is approximately 53 times higher than that of bare CdS nanorods (80 μmol g −1 h −1). The reaction system was highly selective for the oxidation of benzyl alcohol into benzaldehyde. When the amount of benzyl alcohol increased to 1.0 mmol, the hydrogen production reached 9033 μmol g −1 h −1. Scanning electron microscopy and transmission electron microscopy images revealed that p-type MoS 2 sheets with a flower-like structure closely adhered to n-type semiconductor CdS nanorods through the formation of a p-n heterojunction. As a potential Z-scheme photocatalyst, the CdS@MoS 2 heterostructure effectively produces and separates electron-hole pairs under visible light. Thus, the electrons are used for reduction to generate hydrogen, and the holes oxidize benzyl alcohol into benzaldehyde. Moreover, a mechanism of photogenerated charge transfer and separation was proposed and verified by photoluminescence, electrochemical impedance spectroscopy, photocurrent and Mott-Schottky measurements. The results reveal that the CdS@MoS 2 heterojunctions have rapid and efficient charge separation and transfer, thereby greatly improving benzyl alcohol dehy-drogenation. This work provides insight into the rational design of high-performance Z-scheme photocatalysts and the use of holes and electrons to obtain two valuable chemicals simultaneously.

show abstract

“…Among the proposed technologies, visible-light-activated semiconductor photocatalytic technology has been considered one of the most promising strategies for simultaneously overcoming the challenges of environmental pollution and global energy shortage [21][22][23][24][25][26]. Visible-light semiconductor photocatalytic technologies can convert solar energy into valuable chemical fuels, such as clean H 2 and renewable hydrocarbon fuel, from water splitting, as well as from the photoreduction of CO 2 [27][28][29][30][31][32][33][34][35][36]. Concurrently, photocatalytic technology can be used for environmental purification via photocatalytic degradation of various harmful chemical pollutants [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured CdS for efficient photocatalytic H2 evolution: A review

et al. 2020

View full text Add to dashboard Cite

Cadmium sulfide (CdS)-based photocatalysts have attracted extensive attention owing to their strong visible light absorption, suitable band energy levels, and excellent electronic charge transportation properties. This review focuses on the recent progress related to the design, modification, and construction of CdS-based photocatalysts with excellent photocatalytic H 2 evolution performances. First, the basic concepts and mechanisms of photocatalytic H 2 evolution are briefly introduced. Thereafter, the fundamental properties, important advancements, and bottlenecks of CdS in photocatalytic H 2 generation are presented in detail to provide an overview of the potential of this material. Subsequently, various modification strategies adopted for CdS-based photocatalysts to yield solar H 2 are discussed, among which the effective approaches aim at generating more charge carriers, promoting efficient charge separation, boosting interfacial charge transfer, accelerating charge utilization, and suppressing charge-induced self-photocorrosion. The critical factors governing the performance of the photocatalyst and the feasibility of each modification strategy toward shaping future research directions are comprehensively discussed with examples. Finally, the prospects and challenges encountered in developing nanostructured CdS and CdS-based nanocomposites in photocatalytic H 2 evolution are presented.

show abstract

Enhanced photoelectrochemical and photocatalytic activities of CdS nanowires by surface modification with MoS2 nanosheets

Cited by 45 publications

References 54 publications

Ultrathin Visible‐Light‐Driven Mo Incorporating In₂O₃–ZnIn₂Se₄ Z‐Scheme Nanosheet Photocatalysts

Ultrathin Visible‐Light‐Driven Mo Incorporating In₂O₃–ZnIn₂Se₄ Z‐Scheme Nanosheet Photocatalysts

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

Nanostructured CdS for efficient photocatalytic H2 evolution: A review

Contact Info

Product

Resources

About

Enhanced photoelectrochemical and photocatalytic activities of CdS nanowires by surface modification with MoS2 nanosheets

Cited by 45 publications

References 54 publications

Ultrathin Visible‐Light‐Driven Mo Incorporating In2O3–ZnIn2Se4 Z‐Scheme Nanosheet Photocatalysts

Ultrathin Visible‐Light‐Driven Mo Incorporating In2O3–ZnIn2Se4 Z‐Scheme Nanosheet Photocatalysts

Visible-light-driven photocatalytic hydrogen production coupled with selective oxidation of benzyl alcohol over CdS@MoS2 heterostructures

Nanostructured CdS for efficient photocatalytic H2 evolution: A review

Contact Info

Product

Resources

About

Ultrathin Visible‐Light‐Driven Mo Incorporating In₂O₃–ZnIn₂Se₄ Z‐Scheme Nanosheet Photocatalysts

Ultrathin Visible‐Light‐Driven Mo Incorporating In₂O₃–ZnIn₂Se₄ Z‐Scheme Nanosheet Photocatalysts