COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yao Yao,Wenbin Dong,Zhen Zhao,Huina Cui,Gangli Liao
Metastable 1T phase transition-metal dichalcogenides materials have attracted substantial interest as a potential catalyst for photodegradation . However, methods for synthesizing 1T-WS 2 are limited and complicated. Herein, a flexible, structural stable, easy recovery and reusable photocatalyst 1T-WS 2 /Carbon cloth was developed through a simple solvothermal synthesis route. Vertically aligned 1T-WS 2 with large surface area renders ultrahigh photocatalytic activity and durability with respect to organic pollution methylene blue under simulated sunlight illumination. As a consequence, the 1T-WS 2 /CC-200 catalyst presents an improved photodegradation rate as high as 96 % and excellent reusability in continuous test mode. Moreover, the metastable 1T-WS 2 does not transform to stable 2 H phase, even after a five-months exposure in ambient, making the 1T-WS 2 /CC a promising photocatalyst for practical application.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
FUEL
·
2023
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IF 7.4
Rongxin Cao,Hui Yuan,Ning Yang,Qihong Lu,Yuxiong Xue,Xianghua Zeng
Two-dimensional sulfide is considered as one of the best alternative for noble metal cocatalyst, whereas few-layered 1T WS 2 structure is very helpful to promote the photocatalytical activity for hydrogen generation. Herein, few-layered 1T-WS 2 /g-C 3 N 4 composites have been prepared via a facile one-step calcination route and used as a noble metal-free catalyst for H 2 evolution. The results showed that the optimized 1T-WS 2 /g-C 3 N 4 has a H 2 evolution rate of 10.08 mmol∙g −1 h −1 , which is 180 and 2.44 times larger than that of pure pristine g-C 3 N 4 and g-C 3 N 4 (Pt), respectively. The enhanced photocatalytic activity can be explained as the optimized 1T-WS 2 /g-C 3 N 4 sample has an increased light absorption (from visible to infrared region), better electrical conductivity and high density of active sites. The studies will be helpful for constructing high efficient heterostructured catalysts by loading 1T phase metal dichalcogenides 2D of material onto a two-dimensional material surface.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Jianjian Yi,Xiaojie She,Yanhua Song,Mao Mao,Kaixiang Xia,Yuanguo Xu,Zhao Mo,Jingjie Wu,Hui Xu,Huaming Li
To date, despite significant achievements in noble-metal co-catalysts, it is still challenging to develop high-performance noble-metal-alternative co-catalysts for economic hydrogen production. In this work, we demonstrate that the metallic 1T-WS 2 obtained through a facile solvothermal method can function as co-catalyst for boosting the photocatalytic hydrogen production with the merits below: (i) noble-metal-free; (ii) excellent electrical conductivity; (iii) extra active sites on basal plane rather than edge sites for H 2 generation. As demonstrated in photocatalytic hydrogen evolution, the designed composite using two-dimensional carbon nitride (2D-C 3 N 4 ) as semiconductor and 1T-WS 2 as co-catalyst (1T-WS 2 /2D-C 3 N 4 ) exhibits giant enhancement, in comparison with the bare 2D-C 3 N 4 and 2H-WS 2 /2D-C 3 N 4 . This work highlights the surface engineering strategy of co-catalysts such as phase engineering for promoting the photocatalytic performance.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Kai Wang,Nini Zhao,Haiyan Xie,Jingzhi Wang,Wenli Xu,Zhiliang Jin
Improving the separation efficiency of semiconductor photogenerated carriers is an important way to enhance the photocatalytic activity of water splitting. To establish an efficient photocatalytic hydrogen production system, a practical method combining metal-like cocatalysts with semiconductors was designed. This article prepared Ni-CdS by modifying Prussian blue analogues and synthesized Ni-CdS/1T-WS 2 composite materials by low-temperature mixing with metal-like catalyst 1T-WS 2 . At the optimal load concentration, it can reach 62.65 mmol g -1 . Firstly, the close contact interface formed between the two enables rapid transfer of photo generated electrons . Secondly, metal-like cocatalysts have a strong attraction to the charges generated by light, forcing electron hole separation and exacerbating this effect under illumination. This has been strongly demonstrated through a series of characterizations and in-situ radiation X-ray photoelectron spectroscopy. In summary, this study provides a reliable and clear understanding for the modification of Prussian blue analogues and the regulation of photo induced charge transfer by metal-like cocatalysts.
研究领域:
材料科学
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物理化学
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能源催化
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半导体光催化
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纳米材料
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DOI
高影响因子
Nanoscale
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2023
·Vol. 15
·期 39
·16131-16143
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IF 6.7
Jingzhi Wang,Mei Li,Zhiliang Jin
Dynamics and morphology play a crucial role in the field of photocatalytic hydrogen production. Regulating the transfer of photogenerated charges is an effective way to improve the catalytic activity. In this paper, 1T-WS2 is introduced into a p–n heterostructure, ZnCdS/NiV-LDH, as a metalloid electron pump to transfer photogenerated electrons from semiconductors with larger work functions to metalloid materials with smaller work functions, effectively to attract photogenerated electrons, and promote charge rearrangement at the p–n heterostructure interface, so as to achieve the best utilization efficiency of photogenerated charges. Second, adjusting the morphology to increase the light absorption area of the catalyst is also a way to improve the photocatalytic activity. Two different nanosheet structures dispersed heavily stacked ZnCdS, increasing the light absorption area of the system. The optimal catalyst ratio achieves a hydrogen evolution rate of 22.37 mmol g−1 h−1, achieving 7.98% AQE and 2.12% STH conversion efficiency at 450 nm. The potential mechanism was demonstrated through in situ XPS. This study provides new insights into adding “electron pumps” to heterostructures to enhance photocatalytic activity.
研究领域:
材料科学
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催化
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纳米技术
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光化学
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
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2021
·Vol. 14
·期 21
·4752-4763
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IF 8.928
Zhiqiang Li,Wei Zhou,Yuan Tang,Xin Tan,Yizhong Zhang,Zikang Geng,Yuchen Guo,Lequan Liu,Tao Yu,Jinhua Ye
Graphical The schottky heterojunction is constructed based on the Fermi energy level difference between the metal phase 1T-WS 2 and Zn 0.5 Cd 0.5 S. Under visible light irradiation, the tight interfacial contact leads to strong electronic interactions and facilitates the transfer of photogenerated carriers from Zn 0.5 Cd 0.5 S to 1T-WS 2 , further enhancing photocatalytic hydrogen production. Due to inefficient charge separation and low surface catalytic conversion efficiencies, cocatalysts are required for achieving photocatalytic hydrogen evolution. Being a noble-metal-free cocatalyst, metallic 1T-WS 2 with excellent conductivity can function for this reaction. Herein, 1T-WS 2 /Zn 0.5 Cd 0.5 S is constructed via a simple and feasible grinding approach. The composite containing 7.5 % 1T-WS 2 in 1T-WS 2 /Zn 0.5 Cd 0.5 S achieves a hydrogen evolution rate of 61.65 mmol g −1 h −1 and an external quantum efficiency of 8.04 % at 420 nm, which is 37 times that of bare Zn 0.5 Cd 0.5 S (1.67 mmol g −1 h −1 ). The electrical conductivity of metallic 1T-WS 2 reduces the transfer impedance at the interface and thus accelerates the non-radiative energy transfer and electron transport rate. The different Fermi levels of 1T-WS 2 and Zn 0.5 Cd 0.5 S form a Schottky junction, which promotes the transfer of photogenerated electrons from Zn 0.5 Cd 0.5 S to 1T-WS 2 . More importantly, the close interface contact between 1T-WS 2 and Zn 0.5 Cd 0.5 S results in strong electron interactions, which is conducive to the spatial separation of photogenerated electrons and holes. This work will further expand the application of 1T-WS 2 in the photocatalytic hydrogen evolution process.
研究领域:
材料科学
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催化
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光催化
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能源材料
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Mei Dong,Wenjun Li,Liang Geng,Ruixue Huang,Hongli Han,Yuan Liu
Defect engineering has emerged as a powerful strategy for enhancing photocatalytic performance. In this paper, a novel dual-defect 1T-WS 2 /Cd 0.5 Zn 0.5 S (WS v /CZS v ) Schottky heterojunction was successfully fabricated via a combined solvothermal-hydrothermal approach. Electron paramagnetic resonance (EPR) and high-resolution TEM (HRTEM) confirmed the presence of dual sulfur vacancies. The optimized WS v /CZS v composite exhibits exceptional hydrogen evolution performance, achieving a remarkable rate of 3060.63 μmol·g −1 ·h −1 , which are 9.83 and 2.54 times higher than that of pure CZS and CZS v , respectively. Notably, the catalyst maintained over 90 % of its initial activity after four consecutive photocatalytic cycles, demonstrating superior stability. Comprehensive characterization through electrochemical impedance spectroscopy (EIS), steady-state photoluminescence (PL), and transient photocurrent measurements revealed that the dual-defect system significantly enhances carrier separation efficiency. This improvement arises from three synergistic effects: electron-trapping capability of dual defect sites, elevated Schottky barrier, and superior electrical conductivity of the 1T-WS 2 . Furthermore, the metallic characteristics and sulfur vacancies in 1T-WS 2 synergistically provide abundant active sites for photocatalytic hydrogen evolution on both basal planes and edges. Density functional theory (DFT) calculations indicate that the dual defects optimize charge distribution and achieve an ideal hydrogen adsorption free energy. The energy band alignment and charge transfer mechanism were systematically investigated using Mott-Schottky (M-S) analysis and ultraviolet photoelectron spectroscopy (UPS). This work explores the synergistic interactions between different types of sulfur defects and provides new insights into the coupling of defect engineering.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Qimin Peng,Xue Shao,Chuan Hu,Zuyang Luo,Tayirjan Taylor Isimjan,Zhifeng Dou,Ruobing Hou,Xiulin Yang
Developing the earth-abundant transition metal-based bifunctional electrocatalysts for water splitting and renewable energy devices has attracted much attention. Herein, we report a 1 T-WS 2 in ultrathin nanosheet arrays grafted with Co 4 S 3 on conductive carbon cloth (CC) (1 T-Co 4 S 3 -WS 2 /CC) through a feasible in-situ growth and vulcanization. The optimized 1 T-Co 4 S 3 -WS 2 /CC catalyst exhibits an impressive electrocatalytic activity and remarkable stability with the oxygen/hydrogen evolution reaction (OER/HER: 278/75 mV for 10 mA cm −2 ). It also showed the small Tafel slope values of 61.7 and 58.4 mV dec −1 , respectively. Additionally, the 1 T-Co 4 S 3 -WS 2 /CC (−/+) achieved 1.59 V@10 mA cm −2 in alkaline media superior to the most previously reported non-precious metal electrocatalysts. The outstanding performance could be attributed to the synergy between heterostructures of Co 4 S 3 and 1 T-WS 2 modifying the electronic structure to accelerate water splitting kinetics. Thus, this work presents a rational design of scalable, high-efficiency, stable water splitting electrocatalysts based on WS 2 .
研究领域:
材料科学
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电化学
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可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）