Rational design of a novel p-n heterojunction based on 3D layered nanoflower MoSx supported CoWO4 nanoparticles for superior photocatalytic hydrogen generation

Jin, Zhiliang; Yan, Xian; Hao, Xuqiang

doi:10.1016/j.jcis.2020.02.052

Cited by 80 publications

(27 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diffraction peaks at 27.03°, 31.5°, 35.25°, 38.7°, 47.95°, 53.45°, 45.05°, 56.05°, and 58.53° in the XRD spectrum of NiS2 correspond to (111), ( 200), ( 210), ( 211), (220), ( 221), (311), ( 222), (230) crystal planes confirm the successful synthesis of NiS2 26 . In the meantime, the clear diffraction peak indicates that NiS2 has good crystallinity [27][28][29] . In contrast, MoSe2 has poor crystallinity.…”

Section: Structure and Morphology Analysis 311 X-ray Diffraction Analysismentioning

confidence: 96%

High Efficiency Electron Transfer Realized over NiS2/MoSe2 S-Scheme Heterojunction in Photocatalytic Hydrogen Evolution

刘阳¹,

郝旭强²,

胡海强³

et al. 2020

Acta Physico Chimica Sinica

Self Cite

View full text Add to dashboard Cite

S-scheme heterojunction is a major breakthrough in the field of photocatalysis. In this study, NiS2 and MoSe2 were prepared by a typical solvothermal method, and compounded by an in situ growth method to construct an S-scheme heterojunction. The obtained composite showed excellent performance in photocatalytic hydrogen evolution; the hydrogen production rate was approximately 7 mmol•h −1 •g −1 , which was 2.05 times and 2.44 times those of pure NiS2 and MoSe2, respectively. Through a series of characterizations, it was found that NiS2 and MoSe2 coupling can enhance the light absorption intensity, which is vital for the light reaction system. The efficiency of electron-hole pair separation is also among the important factors restricting photocatalytic reactions. Compared with pure NiS2 and MoSe2, NiS2/MoSe2 exhibited a higher photocurrent density, lower cathode current, and lower electrochemical impedance, which proves that the NiS2/MoSe2 complex can effectively promote photogenerated electron transfer. Simultaneously, the lower emission intensity of fluorescence indicated effective inhibition of electron-hole recombination in the NiS2/MoSe2 complex, which is favorable for the photocatalytic hydrogen evolution reaction. Further, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that MoSe2 is an amorphous sample surrounded by the NiS2 nanomicrosphere, which greatly increased the contact area between the two, thus increasing the active site of the reaction. Secondly, as a photosensitizer, Eosin Y (EY) effectively enhanced the absorption of light by the catalyst in the photoreaction system. Meanwhile, during sensitization, electrons were provided to the catalyst, which effectively improved the photocatalytic reaction efficiency. The establishment of S-scheme heterojunctions contributed to improving the redox capacity of the reaction system and was the most important link in the photocatalytic hydrogen reduction of aquatic products. It was also the main reason for the improvement of the hydrogen evolution effect in this study. The locations of the conduction band and valence band of NiS2 and MoSe2 were determined by Mott-Schottky plots and photon energy curves, and further proved the establishment of the S-scheme heterojunction. This work provides a new reference for studying the S-scheme heterojunction to effectively improve the photocatalytic hydrogen production efficiency.

show abstract

Section: Structure and Morphology Analysis 311 X-ray Diffraction Analysismentioning

confidence: 96%

High Efficiency Electron Transfer Realized over NiS2/MoSe2 S-Scheme Heterojunction in Photocatalytic Hydrogen Evolution

刘阳¹,

郝旭强²,

胡海强³

et al. 2020

Acta Physico Chimica Sinica

Self Cite

View full text Add to dashboard Cite

show abstract

“…[232][233][234] The p-n type heterojunction needs to form at the interface of the space charge region and these heterojunctions form an internal potential that guides the e À and h + in opposite directions. [235][236][237][238][239] The e À transfers to the CB of the n-type semiconductor, whereas the h + transfers to the VB of the p-type semiconductor (Fig. 7d).…”

Section: G-c 3 N 4 Heterojunction Nanocompositesmentioning

confidence: 99%

Recent advances in graphite carbon nitride-based nanocomposites: structure, antibacterial properties and synergies

Yan

Meng

et al. 2021

Nanoscale Adv.

View full text Add to dashboard Cite

show abstract

“…Subsequently, transferred the aforementioned suspension into the autoclave and heated at 200 C for 24 h. The solution after the aforementioned reaction was centrifuged and washed several times with ethanol and DI water. Drying the obtained black sample overnight under 60 C. [28,44] After grinding and collecting, the resulting sample was named Mo 15 S 19 .…”

Section: Preparation Of Mo 15 S 19mentioning

confidence: 99%

“…[25][26][27] Therefore, Mo-S has broad application prospects for photocatalysis, but the durability of Mo-S is a shortcoming that cannot be ignored. [28,29] By compounding with another material, the method of constructing a heterojunction is widely regarded as one of the effective strategies to improve the charge mobility and stability.…”

Section: Introductionmentioning

confidence: 99%

2D/3D ZIF‐9/Mo₁₅S₁₉ S‐Scheme Heterojunction for Productive Photocatalytic Hydrogen Evolution

Jin

2021

Energy Tech

Self Cite

View full text Add to dashboard Cite

Flower-like Mo 15 S 19 nanoparticles are successfully attached on the surface of the lamellar cobalt-based zeolite imidazole framework (ZIF-9) according to the physical mixing process herein described. The existence of lamellar ZIF-9 not only avoids the stacking of spherical flower-like Mo 15 S 19 nanoparticles but also enhances the adsorbability of the ZIF-9/Mo 15 S 19 system for Eosin-Y (EY) molecules, which injects more vitality into the hydrogen production reaction. In addition, the lamellar ZIF-9 can be freely stacked and form a regular rich wrinkle structure. Benefitting from this special structure, Mo 15 S 19 nanoparticles with spherical flower-like shape can be adsorbed more firmly between the layers of ZIF-9. This 2D/3D interlaced structure makes the system more stable, which also can improve the adsorption capacity of EY molecules. In addition, the construction of an S-scheme heterojunction between ZIF-9 and Mo 15 S 19 is another nonnegligible driving force for the enhanced photocatalytic performance in this system. The rational establishment of the S-scheme heterojunction provides a more convenient transmission channel for the photogenerated charge. This work uses ZIF-9 as the carrier of Mo 15 S 19 and promotes the catalytic performance of the composite ZIF-9/Mo 15 S 19 by adjusting the evacuation of the spherical Mo 15 S 19 nanoparticles and constructing a heterojunction that can promote the flow ability of charges.

show abstract

Rational design of a novel p-n heterojunction based on 3D layered nanoflower MoSx supported CoWO4 nanoparticles for superior photocatalytic hydrogen generation

Cited by 80 publications

References 72 publications

High Efficiency Electron Transfer Realized over NiS<sub>2</sub>/MoSe<sub>2</sub> S-Scheme Heterojunction in Photocatalytic Hydrogen Evolution

High Efficiency Electron Transfer Realized over NiS<sub>2</sub>/MoSe<sub>2</sub> S-Scheme Heterojunction in Photocatalytic Hydrogen Evolution

Recent advances in graphite carbon nitride-based nanocomposites: structure, antibacterial properties and synergies

2D/3D ZIF‐9/Mo₁₅S₁₉ S‐Scheme Heterojunction for Productive Photocatalytic Hydrogen Evolution

Contact Info

Product

Resources

About

Rational design of a novel p-n heterojunction based on 3D layered nanoflower MoSx supported CoWO4 nanoparticles for superior photocatalytic hydrogen generation

Cited by 80 publications

References 72 publications

High Efficiency Electron Transfer Realized over NiS<sub>2</sub>/MoSe<sub>2</sub> S-Scheme Heterojunction in Photocatalytic Hydrogen Evolution

High Efficiency Electron Transfer Realized over NiS<sub>2</sub>/MoSe<sub>2</sub> S-Scheme Heterojunction in Photocatalytic Hydrogen Evolution

Recent advances in graphite carbon nitride-based nanocomposites: structure, antibacterial properties and synergies

2D/3D ZIF‐9/Mo15S19 S‐Scheme Heterojunction for Productive Photocatalytic Hydrogen Evolution

Contact Info

Product

Resources

About

2D/3D ZIF‐9/Mo₁₅S₁₉ S‐Scheme Heterojunction for Productive Photocatalytic Hydrogen Evolution