Synergistic effect of Z-scheme and oxygen vacancy of CeO2/WO3 heterojunction for enhanced CO2 reduction activity

Yaseen, Maria; Jiang, Hanqiu; Li, Jinhe; Yu, Xiaohui; Ahmad, Mohaira; Ali, Rai Nauman; Wang, Lele; Yang, Juan; Liu, Qinqin

doi:10.1016/j.apsusc.2023.157360

Cited by 25 publications

(4 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high-resolution O 1s XPS spectrum of TCPP exhibited two peaks centered at 531.98 and 533.53 eV, assigned to the CO and C–O bonds in TCPP (Figure c). , Surprisingly, there is a peak centered at 529.44 eV attributed to the Ce–O bond in Figure c, meaning that the Ce 4+ /Ce 3+ ions can form Ce-oxo clusters via coordination with carboxylate ions. As shown in Figure d, the peaks at 882.41, 887.45, 898.58, 900.71, 907.01, and 916.71 eV corresponded to Ce 3d5/2 and Ce 3d3/2 of Ce 4+ in the CMF-200, and the peaks at 885.76 and 904.32 eV corresponded to Ce 3d5/2 and Ce 3d3/2 of Ce 3+ in the CMF-200 sample. − The generation of Ce 3+ ions is mainly attributed to the reduction of Ce 4+ by DMF or dimethylamine at a relatively high reaction temperature. In Figure e, three peaks at 397.66, 399.82, and 400.91 eV could be identified as CN, N–H, and C–N bonds in TCPP, respectively .…”

Section: Resultsmentioning

confidence: 93%

Improving the Photoactivity of Porphyrin-Based Metal–Organic Frameworks via Constructing [Ce–O] Active Site and Vacancy

Cheng,

Ren,

Wang

et al. 2024

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

Defect engineering of metal−organic frameworks (MOFs) is a versatile approach to tailoring their electronic structures and photocatalytic performance. Herein, Ce-based porphyrin MOFs (CMFs) featuring controlled structural defects were successfully prepared using a simple acid modulation strategy to drive the photocatalytic H 2 generation. The [Ce−O] unit serves as the active site via a ligand-to-metal charge transfer process, which has been confirmed by in situ XPS analysis. Abundant exposed coordinatively unsaturated Ce−O centers are beneficial for the adsorption and activation of water molecules, which is an important factor for improving the photocatalytic performance of the synthesized defective MOFs. In addition, optical and electrochemical experiments indicate that CMFs with more oxygen vacancies possess higher charge separation efficiency. As a result, the optimized CMF(Zn)-200 sample afforded high stability and activity in the H 2 generation (up to 1603.3 μmol•g −1 •h −1 under cocatalyst-free conditions) and tetracycline hydrochloride removal efficiency (97%), which was 8.45 and 97 times higher than that of pure meso-tetra(4-carboxyphenyl)porphine. This study demonstrates that effective structural modulation and defect introduction can improve the activity and stability of PMOF-based photocatalysts.

show abstract

Section: Resultsmentioning

confidence: 93%

Improving the Photoactivity of Porphyrin-Based Metal–Organic Frameworks via Constructing [Ce–O] Active Site and Vacancy

Cheng,

Ren,

Wang

et al. 2024

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to the limitation of energy band matching, the construction of Z-scheme heterojunctions requires that the energy bands of the two materials exhibit a stepped structure . Tungsten oxide (WO 3 ) is a traditional n-type semiconductor with a band gap width of 2.6–3.0 eV and has been widely studied as a promising semiconductor material for NO 2 gas detection due to its low limit of defection and high stability. − Cerium dioxide (CeO 2 ) has the advantages of plentiful oxygen storage capacity, abundant oxygen vacancies, favorable thermal stability, and easy conversion between Ce 3+ and Ce 4+ oxidation states. − Its energy band structure is highly compatible with WO 3 , and the two can successfully construct direct Z-scheme heterojunctions. , In this work, we constructed two direct Z-scheme heterojunctions, i.e., WO 3 /CeO 2 and CeO 2 /WO 3 , by modulating the host nanomaterial to be WO 3 and CeO 2 , respectively. Both heterojunctions were synthesized by hydrothermal and annealing methods.…”

Section: Introductionmentioning

confidence: 99%

“…35−37 Its energy band structure is highly compatible with WO 3 , and the two can successfully construct direct Z-scheme heterojunctions. 38,39 In this work, we constructed two direct Z-scheme heterojunctions, i.e., WO 3 /CeO 2 and CeO 2 /WO 3 , by modulating the host nanomaterial to be WO 3 and CeO 2 , respectively. Both heterojunctions were synthesized by hydrothermal and annealing methods.…”

Section: Introductionmentioning

confidence: 99%

Constructing Z-Scheme WO₃–CeO₂ Heterojunctions for Selective Sensing of NO₂ or Acetone Gas under UV Light Irradiation

Qin,

Guo,

Liang

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Light assistance and the construction of heterojunctions between two semiconductors with matching band structures are effective strategies for obtaining efficient gas sensors. Recently, Z-scheme heterojunctions have shown marked potential in promoting the separation and transfer of photogenerated carriers as well as possessing strong redox capability. In this study, two types of nanocomposites of WO 3 /CeO 2 and CeO 2 /WO 3 with Z-scheme heterojunctions were designed and prepared with WO 3 and CeO 2 as host materials, respectively. In the case of the WO 3 /CeO 2 nanocomposite, the CeO 2 nanoparticles are evenly distributed and attached to the WO 3 host. Conversely, in the CeO 2 /WO 3 nanocomposite, WO 3 is completely covered by the CeO 2 nanoparticles, forming a core−shell structure. The construction of Z-scheme heterojunctions effectively suppresses the recombination of photogenerated carriers, generates more active sites, and enhances redox capability. Resultantly, under UV light assistance, the sensors based on heterojunctions of WO 3 /CeO 2 and CeO 2 /WO 3 exhibit a selective response toward the oxidizing gas of NO 2 and the reducing gas of acetone, respectively, at room temperature. The WO 3 /CeO 2 sensor exhibits a response of 6.82 toward 100 ppb NO 2 , while the CeO 2 /WO 3 sensor exhibits a response of 6.45 toward 10 ppm acetone at room temperature (RT) under UV irradiation. The dynamic response/recovery characteristics of both heterojunction sensors were improved by UV irradiation, with an obvious shortening of the response/recovery time compared to the case in the dark. The experimental results demonstrate that the two sensors are capable of detecting NO 2 and acetone gases at RT, respectively. This work expands the application of Z-scheme heterojunctions in gas sensing and provides a strategy based on the design of special Z-scheme heterojunctions for developing high-performance gas sensors toward selective detection of oxidizing or reducing gas.

show abstract

“…For example, the ZnIn 2 S 4 /ZrO 2 composite photocatalyst generated using the photothermal method may considerably increase photocatalytic hydrogen generation performance [9]. Electrostatic assembly was used to create the CeO 2 /WO 3 Z-scheme heterojunction, which has a higher CO 2 reduction capacity in visible light due to its good charge separation efficiency [10].…”

Section: Introductionmentioning

confidence: 99%

Controllable Synthesis, Photocatalytic Property, and Mechanism of a Novel POM-Based Direct Z-Scheme Nano-Heterojunction α-Fe2O3/P2Mo18

Zhang,

Zhao,

Huang

et al. 2023

Molecules

View full text Add to dashboard Cite

In order to improve photocatalytic activity and maximize solar energy use, a new composite material Fe2O3/P2Mo18 was prepared by combining polyoxometalates (P2Mo18) with Fe2O3 nanosheets. FT-IR, XRD, XPS, SEM, TEM, UV-vis, EIS, and PL were used to characterize the composite material, and nano-Fe2O3 of different sizes and morphologies with a controllable absorption range was prepared by adjusting the reaction time, and, when combined with P2Mo18, a composite photocatalyst with efficient visible light response and photocatalytic activity was constructed. The EIS, Bode, and PL spectra analysis results show that the Fe2O3/P2Mo18 composite material has outstanding interfacial charge transfer efficiency and potential photocatalytic application possibilities. Model reactions of methylene blue (MB) and Cr (VI) photodegradation were used to evaluate the redox activity of Fe2O3/P2Mo18 composites under simulated visible light. The photocatalytic degradation rate was as high as 98.98% for MB and 96.86% for Cr (VI) when the composite ratio was Fe2O3/P2Mo18-5%. This research opens up a new avenue for the development of high-performance photocatalysts.

show abstract

Synergistic effect of Z-scheme and oxygen vacancy of CeO2/WO3 heterojunction for enhanced CO2 reduction activity

Cited by 25 publications

References 59 publications

Improving the Photoactivity of Porphyrin-Based Metal–Organic Frameworks via Constructing [Ce–O] Active Site and Vacancy

Improving the Photoactivity of Porphyrin-Based Metal–Organic Frameworks via Constructing [Ce–O] Active Site and Vacancy

Constructing Z-Scheme WO₃–CeO₂ Heterojunctions for Selective Sensing of NO₂ or Acetone Gas under UV Light Irradiation

Controllable Synthesis, Photocatalytic Property, and Mechanism of a Novel POM-Based Direct Z-Scheme Nano-Heterojunction α-Fe2O3/P2Mo18

Contact Info

Product

Resources

About

Synergistic effect of Z-scheme and oxygen vacancy of CeO2/WO3 heterojunction for enhanced CO2 reduction activity

Cited by 25 publications

References 59 publications

Improving the Photoactivity of Porphyrin-Based Metal–Organic Frameworks via Constructing [Ce–O] Active Site and Vacancy

Improving the Photoactivity of Porphyrin-Based Metal–Organic Frameworks via Constructing [Ce–O] Active Site and Vacancy

Constructing Z-Scheme WO3–CeO2 Heterojunctions for Selective Sensing of NO2 or Acetone Gas under UV Light Irradiation

Controllable Synthesis, Photocatalytic Property, and Mechanism of a Novel POM-Based Direct Z-Scheme Nano-Heterojunction α-Fe2O3/P2Mo18

Contact Info

Product

Resources

About

Constructing Z-Scheme WO₃–CeO₂ Heterojunctions for Selective Sensing of NO₂ or Acetone Gas under UV Light Irradiation