Novel Z-scheme W18O49/CeO2 heterojunction for improved photocatalytic hydrogen evolution

Shen, Chunhui; Wen, Xiao-Ju; Fei, Zhenghao; Liu, Zongtang; Mu, Qi-Ming

doi:10.1016/j.jcis.2020.06.075

Cited by 86 publications

(42 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may be due to the existence of oxygen vacancy in semiconductor WO, so its UV diffuse reflection pattern shows a wide absorption band, which indicates that WO has a strong visible light absorption performance. [38] Further analysis of Figure 4a showed that the UV-Vis DRS absorption curve of the composite catalyst with different proportions of WO did not significantly change compared with that of pure MCS. This indicates that the composite catalyst 5 % WO/MCS synthesized by hydrothermal method has strong optical stability.…”

Section: Analysis Of Xps and Uv-vis Drsmentioning

confidence: 95%

“…This corresponds to the crystal plane (002) of MCS and crystal plane (010) of WO respectively, which is the same as the previous report. [38,39] Figures 2g and 2 2i, it can be clearly seen from EDX element mapping that there are elements such as Mn, Cd, S, W, and O in the 5 %WO/MCS composite catalyst, and these elements are uniformly distributed in the 5 %WO/MCS. All characterization results confirmed that WO was successfully loaded onto the surface of MCS.…”

Section: Analysis Of Structure and Morphology Of Photocatalystmentioning

confidence: 95%

“…Then the above-mentioned solution was added to 80 mL Teflon-lined autoclave, heated in an oven at 180°C for 12 h. After natural cooling, the solution was centrifuged to collect solid sediments and rinsed in deionize water and anemic ethanol. [38] Finally, the powder obtained after drying in the oven was pure W 18 O 49 , marked as WO in this article.…”

Section: Synthesis Of W 18 O 49mentioning

confidence: 99%

“…According to the Mott-Schottky curve in Figure 9a and Figure 9b, the flat band potentials of WO and MCS relative to saturated calomel electrode (SCE) are 0.76 V and À 0.91 V, respectively. [38,39] In general, for n-type semiconductors, E CB is 0.1 or 0.2 V more negative than E fb . [69] In this paper, we set 0.…”

Section: Mechanism Analysismentioning

confidence: 99%

“…These results indicate that the S-Scheme heterojunction composite catalyst can promote the separation and transfer rate of photogenerated electrons, reduce the activation energy of the photocatalytic reaction system, and improve the performance of photocatalytic reduction of hydrogen production. [38] * 2H 2 O and 12.5 mM thioacetamide were added into 60 mL ethanediamine, ultrasonic for 30 min, and stirred under magnetic stirrer for 1 h. Then, the above-mentioned solution was added to 80 mL Teflon-lined autoclave, heated in an oven at 160°C for 24 h. After natural cooling, the solution was centrifuged to collect solid sediments and rinsed in deionize water and ethanol. [39] Finally, the powder obtained after drying in the oven was pure Mn 0.2 Cd 0.8 S, marked as MCS in this article.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

S‐scheme W₁₈O₄₉/Mn_0.2Cd_0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

et al. 2021

ChemCatChem

View full text Add to dashboard Cite

To deal with the energy crisis brought by economic development and solve the traditional situation where only fossil fuels can be used, we prepared S-scheme heterojunction composite photocatalyst W 18 O 49 /Mn 0.2 Cd 0.8 S for photocatalytic hydrogen production by Physical stirring method. The hydrogen production performance of composite photocatalyst W 18 O 49 /Mn 0.2 Cd 0.8 S in visible light is evaluated by a series of photocatalytic analysis and characterization methods. The results showed that the hydrogen production activity was the highest when the load ratio of W 18 O 49 was 5 %, and the hydrogen production amount reached 268.65 μmol (5373 μmol h À 1 g À 1 ) for 5 h, which was 2.96 times of the hydrogen production amount of pure Mn 0.2 Cd 0.8 S (90.76 μmol). The results show that the improvement of hydrogen production performance is mainly due to the formation of S-scheme heterojunction between W 18 O 49 and Mn 0.2 Cd 0.8 S contact interface, which promotes the consumption of ineffective electrons and holes, increases the rate of charge separation and transfer, reduces the activation energy of the catalytic reaction system, and enhances the performance of photocatalytic hydrogen production. The successful completion of this work provides a new idea for the modification of Mn 0.2 Cd 0.8 S semiconductor material and improves its application in photocatalytic hydrogen production.

show abstract

Section: Analysis Of Xps and Uv-vis Drsmentioning

confidence: 95%

Section: Analysis Of Structure and Morphology Of Photocatalystmentioning

confidence: 95%

Section: Synthesis Of W 18 O 49mentioning

confidence: 99%

Section: Mechanism Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

S‐scheme W₁₈O₄₉/Mn_0.2Cd_0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

et al. 2021

ChemCatChem

View full text Add to dashboard Cite

show abstract

Photocatalytic Z‐Scheme Overall Water Splitting: Recent Advances in Theory and Experiments

et al. 2021

View full text Add to dashboard Cite

Photocatalytic water splitting is considered one of the most important and appealing approaches for the production of green H2 to address the global energy demand. The utmost possible form of artificial photosynthesis is a two‐step photoexcitation known as “Z‐scheme”, which mimics the natural photosystem. This process solely relies on the effective coupling and suitable band positions of semiconductors (SCs) and redox mediators for the purpose to catalyze the surface chemical reactions and significantly deter the backward reaction. In recent years, the Z‐scheme strategies and their key role have been studied progressively through experimental approaches. In addition, theoretical studies based on density functional theory have provided detailed insight into the mechanistic aspects of some breathtakingly complex problems associated with hydrogen evolution reaction and oxygen evolution reaction. In this context, this critical review gives an overview of the fundamentals of Z‐scheme photocatalysis, including both theoretical and experimental advancements in the field of photocatalytic water splitting, and suggests future perspectives.

show abstract

Rationally Designed CeO₂ Nanosheets over Co₉S₈ Nanoparticles form S‐Scheme Heterojunction for Efficient Hydrogen Production

Yang

Jin

2023

Advanced Sustainable Systems

View full text Add to dashboard Cite

Enriching the active sites of catalysts and artificially regulating the directional migration of photogenerated carriers are effective means to improve the catalytic activity of photocatalysts. In this work, CeO2 nanosheets are prepared by calcination at high temperatures, and the S‐scheme heterojunction photocatalyst CeO2@Co9S8 is prepared by coupling the Co9S8 nanoparticles prepared by hydrothermal method on CeO2 nanosheets. The large specific surface area of CeO2 nanosheets provides sufficient loading sites for Co9S8 and Co9S8 nanoparticles can effectively disperse with the help of CeO2 nanosheet structure, which effectively inhibits the agglomeration of nanoparticles. The high photosensitivity of Co9S8 increases the utilization of CeO2@Co9S8 S‐scheme heterojunction to visible light. The construction of S‐scheme heterojunction improves the separation efficiency of photogenerated carriers, prolongs the service life of photogenerated charges, retains the photogenerated electrons and holes with strong reduction and oxidation ability in the catalyst system, and improves the performance of photocatalytic hydrogen production. The hydrogen yield of 15 wt% Co9S8 supported CeO2@Co9S8 can reach 15.7 times CeO2 and 2.5 times Co9S8, and the composite catalyst has good stability. This work provides a new way for adjusting the surface structure and carrier behavior of photocatalysts.

show abstract

Novel Z-scheme W18O49/CeO2 heterojunction for improved photocatalytic hydrogen evolution

Cited by 86 publications

References 43 publications

S‐scheme W₁₈O₄₉/Mn_0.2Cd_0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

S‐scheme W₁₈O₄₉/Mn_0.2Cd_0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

Photocatalytic Z‐Scheme Overall Water Splitting: Recent Advances in Theory and Experiments

Rationally Designed CeO₂ Nanosheets over Co₉S₈ Nanoparticles form S‐Scheme Heterojunction for Efficient Hydrogen Production

Contact Info

Product

Resources

About

Novel Z-scheme W18O49/CeO2 heterojunction for improved photocatalytic hydrogen evolution

Cited by 86 publications

References 43 publications

S‐scheme W18O49/Mn0.2Cd0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

S‐scheme W18O49/Mn0.2Cd0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

Photocatalytic Z‐Scheme Overall Water Splitting: Recent Advances in Theory and Experiments

Rationally Designed CeO2 Nanosheets over Co9S8 Nanoparticles form S‐Scheme Heterojunction for Efficient Hydrogen Production

Contact Info

Product

Resources

About

S‐scheme W₁₈O₄₉/Mn_0.2Cd_0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

S‐scheme W₁₈O₄₉/Mn_0.2Cd_0.8S Heterojunction for Improved Photocatalytic Hydrogen Evolution

Rationally Designed CeO₂ Nanosheets over Co₉S₈ Nanoparticles form S‐Scheme Heterojunction for Efficient Hydrogen Production