Boosting solar driven hydrogen evolution rate of CdS nanorods adorned with MoS2 and SnS2 nanostructures

Ramanadha, M.; Kumar, K. Sunil; Subramanyam, K.; Ratnakaram, Y.C.; Sudharani, A.; Reddy, D. Amaranatha; Vijayalakshmi, R.P.

doi:10.1016/j.colcom.2021.100437

Cited by 12 publications

(10 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increasing yield of CH4 in the case of MoS2 can be attributed to the accumulated electrons from charged excitons on catalyst surface [43], which facilitates muti-electron reduction reactions, such as CO2→CH4 (8 electron transfer). Correspondingly, the production of H2 on MoS2 by the single electron reduction process (H + + e→H•) is much lower than that on SnS2 as reported [44][45][46]. According to Figure 5a, the total amounts of H2, CH4, and CO generated on SnS2/MoS2 catalyst were 915.2, 81.52, and 33.0 µmol/g within 22 h (Figure 5a).…”

Section: Photocatalytic Activitymentioning

confidence: 79%

“…However, besides the photocatalytic activity, selectivity is another important factor that influences the performance of a photocatalyst, which has rarely been studied in S-scheme heterojunction photocatalysts. Previous studies have shown that accumulated electrons on the catalyst surface facilitate multi-electron reduction reactions, meanwhile dispersed electrons are inclined to participate in single or two electron reduction processes [43][44][45][46]. In an S-scheme MoS2/SnS2 heterojunction structure, photo-excited electrons in the CB of MoS2 will combine with holes in the VB of SnS2 owing to internal electric field (IEF), leaving the CB electrons of SnS2 and VB holes of MoS2 highly dispersed on the heterojunction surface.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

SnS2 Quantum Dots Decorated MoS2 Nanosheets Enabling Efficient Photocatalytic H2 Evolution in CO2 Saturated Water

Chen¹,

Luo²,

Liu³

et al. 2023

Photocatalysis: Research and Potential

View full text Add to dashboard Cite

SnS2/MoS2 heterojunction nanocomposite was prepared by a one-step hydrothermal synthesis method. The nanocomposite exhibited much improved photocatalytic hydrogen evolution performance in CO2 saturated solution compared with pure MoS2 and SnS2 samples. The improved photocatalytic activity was attributed to the S-scheme heterojunction structure between SnS2 quantum dots and MoS2 nanosheets which facilitate electron-hole separation both in MoS2 and SnS2. In the S-scheme structure, the strong reduction ability of SnS2 quantum dots was well maintained for the improved H2 evolution. In situ DRIFT studies allowed us to suggest reaction pathways from CO2 and H2O to photocatalytic H2, CO, and CH4 generation.

show abstract

Section: Photocatalytic Activitymentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

SnS2 Quantum Dots Decorated MoS2 Nanosheets Enabling Efficient Photocatalytic H2 Evolution in CO2 Saturated Water

Chen¹,

Luo²,

Liu³

et al. 2023

Photocatalysis: Research and Potential

View full text Add to dashboard Cite

show abstract

“…In the electrochemical impedance diagram, the radius of the semicircle in the high-frequency region is positively correlated with the charge transfer resistance, reflecting the transfer characteristics of photogenerated electrons and holes in the catalysts under the light conditions. According to the test results, the impedance radius of the MoS 2 /SnS 2 composite catalysts showed a trend of decreasing and then increasing as the reaction time increased, in which the MS14-2-H composite catalyst had the smallest impedance radius and presented a high charge transfer migration efficiency [ 48 ]. This also proves that a suitable reaction time has a great impact on the electronic structure of the two components in the catalysts, resulting in the improvement of their charge transfer capacity and thus the photocatalytic degradation performance.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of MoS2/SnS2 Photocatalysts with Heterogeneous Structures Enhances Photocatalytic Activity

Pan

Liu

et al. 2023

Materials

View full text Add to dashboard Cite

The use of solar photocatalysts to degrade organic pollutants is not only the most promising and efficient strategy to solve pollution problems today but also helps to alleviate the energy crisis. In this work, MoS2/SnS2 heterogeneous structure catalysts were prepared by a facile hydrothermal method, and the microstructures and morphologies of these catalysts were investigated using XRD, SEM, TEM, BET, XPS and EIS. Eventually, the optimal synthesis conditions of the catalysts were obtained as 180 °C for 14 h, with the molar ratio of molybdenum to tin atoms being 2:1 and the acidity and alkalinity of the solution adjusted by hydrochloric acid. TEM images of the composite catalysts synthesized under these conditions clearly show that the lamellar SnS2 grows on the surface of MoS2 at a smaller size; high-resolution TEM images show lattice stripe distances of 0.68 nm and 0.30 nm for the (002) plane of MoS2 and the (100) plane of SnS2, respectively. Thus, in terms of microstructure, it is confirmed that the MoS2 and SnS2 in the composite catalyst form a tight heterogeneous structure. The degradation efficiency of the best composite catalyst for methylene blue (MB) was 83.0%, which was 8.3 times higher than that of pure MoS2 and 16.6 times higher than that of pure SnS2. After four cycles, the degradation efficiency of the catalyst was 74.7%, indicating a relatively stable catalytic performance. The increase in activity could be attributed to the improved visible light absorption, the increase in active sites introduced at the exposed edges of MoS2 nanoparticles and the construction of heterojunctions opening up photogenerated carrier transfer pathways and effective charge separation and transfer. This unique heterostructure photocatalyst not only has excellent photocatalytic performance but also has good cycling stability, which provides a simple, convenient and low-cost method for the photocatalytic degradation of organic pollutants.

show abstract

“…Since the solution pH can modify both the acid-base environment and the existing forms of Cr(VI), it is well established that the solution pH values exert a significant effect on photocatalytic activities ( Zhang et al, 2018 ; Mangiri et al, 2021 ; Kumar et al, 2022 ). The effects of varying the initial pH on Cr(VI) reduction are demonstrated in Figures 5A,B According to Figure 5A , the adsorption equilibrium between catalysts and Cr(VI) can be attained after they were mixed for 40 min, because the Cr(VI) concentration did not decrease when the adsorption duration was further raised to 60 min.…”

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Solution Ph On Cr(vi) Reduction and Cap Degradationmentioning

confidence: 99%

Synergistic Cr(VI) Reduction and Chloramphenicol Degradation by the Visible-Light-Induced Photocatalysis of CuInS2: Performance and Reaction Mechanism

Zhu

Chai

et al. 2022

Front. Chem.

View full text Add to dashboard Cite

Despite significant scientific efforts in the field of water treatment, pollution of drinking water by toxic metal ions and synthetic organic compounds is becoming an increasing problem. The photocatalytic capabilities of CuInS2 nanoparticles were examined in this study for both the degradation of chloramphenicol (CAP) and the reduction of Cr(VI). CuInS2 nanoparticles were produced using a straightforward solvothermal approach and subsequently characterized by many analysis techniques. Simultaneous photocatalytic Cr(VI) reduction and CAP oxidation by the CuInS2 nanoparticles under visible-light demonstrated that lower pH and sufficient dissolved oxygen favored both Cr(VI) reduction and CAP oxidation. On the basis of active species quenching experiments, the possible photocatalytic mechanisms for Cr(VI) conversion with synchronous CAP degradation were proposed. Additionally, the CuInS2 retains a high rate of mixed pollutant removal after five runs. This work shows that organic contaminants and heavy metal ions can be treated concurrently by the visible-light-induced photocatalysis of CuInS2.

show abstract

Boosting solar driven hydrogen evolution rate of CdS nanorods adorned with MoS2 and SnS2 nanostructures

Cited by 12 publications

References 50 publications

SnS2 Quantum Dots Decorated MoS2 Nanosheets Enabling Efficient Photocatalytic H2 Evolution in CO2 Saturated Water

SnS2 Quantum Dots Decorated MoS2 Nanosheets Enabling Efficient Photocatalytic H2 Evolution in CO2 Saturated Water

Hydrothermal Synthesis of MoS2/SnS2 Photocatalysts with Heterogeneous Structures Enhances Photocatalytic Activity

Synergistic Cr(VI) Reduction and Chloramphenicol Degradation by the Visible-Light-Induced Photocatalysis of CuInS2: Performance and Reaction Mechanism

Contact Info

Product

Resources

About