JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 53
·期 2
·899-906
·
IF 2.1
Wang Caiyun,Zhou Yanhong,Liu Zhimin
A composite of WO 3 and WS 2 has a wider wavelength range of light adsorption and light emission than WS 2 . A noble metal nanostructure can be utilized to adjust the photoluminescence (PL) of luminescent materials. In this study, WO 3 -WS 2 flakes were synthesized. A straightforward bath method has been employed to synthesize Ag nanoparticles (NPs). The average size of Ag NPs is approximately 60 nm. The Fourier transform infrared (FT-IR) peak of WO 3 -WS 2 flake at 495 cm −1 is from an alkane S–S bond stretching vibration. The PL intensity of WO 3 -WS 2 was attenuated subsequent to its integration with Ag NPs. The PL quantum yield of the WO 3 -WS 2 /Ag composite can reach 0.11%. This occurrence can be explained by the pronounced resonance absorption and diminished light extraction induced by the Ag NPs. This decreased light emission of the Ag NPs incorporated with WO 3 -WS 2 may be employed in some situations needing extinction, such as photography and projection. Graphical Abstract
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 15
·e202300440
·
IF 4.5
Xiaoyue Zhang,Yong Yang,Lijun Xiong,Tianyu Wang,Mengwei Xue,Jianhua Ge,Zheng Tang,Panjie Li,Nan Yin,Jinyou Shen
Graphical Under light excitation , WOS broadens the photo-response range through Z-scheme heterojunction. Its photothermal effect can convert light into heat and accelerate the reaction. This efficient photothermal technology facilitates CO 2 reduction. Photothermal CO 2 reduction using H 2 O combined with photocatalysis-driven H 2 O splitting combined with thermal catalysis-supported CO 2 reduction has attracted rapid interest in artificial synthesis of solar fuel. With respect to extremely efficient photothermal catalysis, the photothermal impact of TMDCs (Transition Metal Dichalcogenides) facilitates CO 2 reduction by activating lattice oxygen in oxide to enhance H 2 O oxidation. However, the fixed band gap of single photocatalyst is limited. The purpose of this work is to expand the band gap and improve the redox capacity. Hollow boxwood ball-like WO 3 /WS 2 Z-scheme heterojunctions were prepared and used for photothermal catalytic CO 2 reduction. DFT calculations and UV-Vis spectra show LSPR effect in WOS heterojunctions, and the optical response extends to near infrared region. By comparison, the photothermal catalytic reduction of WO 3 /WS 2 (9.717 μmol) by CO 2 at 513 K is higher than that at 298 K (1.198 μmol) by a factor of 8. The formation of Z-scheme heterojunction promotes rapid carrier transfer and lowers the reaction energy barrier. As well as the hollow structure improves light utilization and increases the interfacial area and number of active sites. In addition, the WO 3 /WS 2 heterostructure utilizes its unique LSPR effect to generate heat through the photothermal effect, which can also promote molecular activation. This work reveals the important role of the LSPR effect in photothermal catalysis and demonstrates a TMDCs-based photothermal-driven catalysts, which presents a promising approach for designing of photothermal catalytic CO 2 reduction.
研究领域:
催化
·
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Cai Xu,Liyan Dai,Yingqi Chen,Shaoyong Zhang,Chaozheng He,Xiaozhong Wang
WO 3 -WS 2 supported on mesoporous N, S co-doped carbon were prepared via one-step molten-salt strategy, and an enhanced interfacial interaction between metal and carbon was formed, which boosted the selective oxidation of benzyl alcohol to benzaldehyde. Under green conditions (solvent: H 2 O, oxidant: H 2 O 2 , no base-additives), 96.2 % conversion and 97.0 % selectivity were achieved within 2 h. It was found that N, S co-doped carbon with abundant mesopores served as an excellent support, the pyrrolic and graphitic N species of carbon provided main anchoring sites for metal nanoparticles. Additionally, the N, S co-doped carbon support could effectively promote the distribution of metal species, and thereafter induced the formation of metal–carbon interfacial interaction. Such advantages resulted in the satisfactory reusability (negligible activity loss after six cycles) and remarkable catalytic activity. The scavenger tests and EPR results disclosed that ·OH was the main oxidative species for this reaction. DFT calculations revealed that co-doping of N, S into carbon promoted the adsorption of benzyl alcohol, and the enhanced metal–carbon interaction reduced migration energy barrier of ·OH on catalyst surface. In sum, this work provided some new insights into the interfacial interaction of mesoporous carbon supported metal catalyst for boosting the selective oxidation of alcohols.
研究领域:
催化化学
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yiding Li,Qiang Zhang,Simin Shen,Siqi Wang,Liangliang Shi,Dequan Liu,Yujun Fu,Deyan He
Effectively limiting the shuttle effect is the key to improving the electrochemical performance of Li-S batteries. Here, the synthesis of WO 3 -WS 2 heterostructures is reported by electrospinning and in situ sulfurization strategies, combining the initial WO 3 nanoparticles with the sulfurization product WS 2 . It was found that the obtained bifunctional heterostructures enhance the electrolyte wettability, optimize intermediate regulation performance, accelerate Li + /e − diffusion, and thus exhibit excellent electrochemical characteristics in Li-S batteries. Through experiments and density functional theory (DFT) calculations, the WO 3 -WS 2 heterostructures were considered as a coupled creative solution with multiple advantages. Different from the batteries using single-component or single-configuration catalyst, the prepared Li-S batteries with the WO 3 -WS 2 heterostructures exhibited synergistic enhanced electrochemical performance and high-temperature crushing resistance. Even under severe conditions, including high sulfur loading (10.3 mg cm −2 ), lean electrolyte (5.8 μL mg −1 ), high current density (7.0 A g −1 ), extended cycling (1600 cycles), and high temperature (90 °C), the representative battery exhibited stable cycling performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）