DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 8
·2715-2721
·
IF 4.052
Lin Lin,Siyu Huang,Yuxin Zhu,Biao Du,Zhihua Zhang,Chao Chen,Xuewen Wang,Ning Zhang
A new synthetic method was used to develop a CdS/MoS2 heterojunction. Cd-MOF was coated onto the surface of MoS2 flowers to construct a core–shell MoS2@Cd-MOF. Thioacetamide was used as a sulfur source to sulfurize the MoS2@Cd-MOF to form a CdS/MoS2 heterojunction. Since the Cd2+ ions were highly ordered and separated by the organic ligands of the Cd-MOF shell, the as-synthesized CdS/MoS2 heterojunction possessed a large surface area and intimate contact at the heterogeneous interface with a uniform loading of CdS nanoparticles on the MoS2 flowers. Consequently, the CdS/MoS2 heterojunction exhibited a significantly enhanced photocatalytic H2 evolution rate of average 5587 μmol h−1 g−1 under UV-visible light irradiation.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 3
·1-11
·
IF 2.253
Lou Xue,Yao Lianfei,Wang Liangyu,Chi Xiaochun,Wang Wenyan,Sui Ning,Zhang Hanzhuang,Xu Wen,Pan Lingyun,Zhou Qiang,Wang Yinghui
2D transition metal dichalcogenides (TMDCs) nanocrystals and related semiconductor–metal heterostructures are promising new materials for efficient opto-electrical conversion because of their unique physical and chemical properties. The design and optimization of such materials require the understanding of exciton and charge carrier dynamics. The illumination-dependent carrier dynamics of CdS/MoS 2 heterostructure nanocrystals (CdS/MoS 2 HNCs) film is investigated by employing the voltage-current test, in which the CdS nanocrystals (NCs) film is used as a reference. The photocurrent performance of carriers in the CdS/MoS 2 HNCs is 70 times higher than that in CdS NC film, owing to the excellent interfacial hole transfer from the CdS component to the monolayer MoS 2 in CdS/MoS 2 HNCs, which effectively reduces the bulk and surface charger recombination. It means that the remaining electron in CdS component after hole transfer plays an important role in the final photocurrent performance. The annealing effect also plays a positive role in the photocurrent performance of nanocrystal film for CdS/MoS 2 HNC and CdS NC film. In addition, the transient absorption test is also used to exclude the possibility of interfacial electron transfer. The final results suggest that the construction of nano-heterojunction can affect the carrier dynamics of nanomaterials and enhance light responsiveness, which is conductive to the design and application of photovoltaic devices in the future.
研究领域:
材料科学
·
物理化学
·
光电器件
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xing-Liang Yin,Lei-Lei Li,Da-Cheng Li,Zhong-Jia Li,Yuan-Xu Wang,Xiang-Jin Kong,Jin-Sheng Zhao,Jian-Hua Jiang,Jun-Chao Qian,Dong-Hui Pang,Xin-Xin Du,Jian-Min Dou
Photocatalytic water splitting is considered to be a green H 2 generation approach and has potential to be applied in the future. As a photocatalytic active material for H 2 evolution, CdS is a good candidate. However, the pristine CdS still suffers from low efficiency and poor stability. To address those issues, we developed noble-metal-free CdS@MoS 2 core-shell nanoheterostructures which exhibit outstanding photocatalytic H 2 evolution performance thus far with rate of 62.55 mmol g −1 h −1 , which exceeds that of pristine CdS by a factor of 148. Meanwhile, the photocatalytic stability can be well retained with no deterioration of activity in 24 h reaction. The excellent performance can be reasonably attributed to the low crystallinity of MoS 2 with numerous active sites provided, and the band alignment of CdS and MoS 2 as determined by valence band-XPS and Mott-Schottky plots analysis, which significantly promotes charge transportation and separation. The enhanced photocatalytic stability here should be ascribed to the intimate growth of MoS 2 shells which significantly passivate the surface trap states of CdS cores and thus the photocorrosion is remarkably retarded. This novel strategy will inspire the fabrication of other photocatalytic systems, and may high-efficient photocatalysts be obtained.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 71
·44626-44631
·
IF 3.108
Xianglin Zhu,Peng Wang,Qianqian Zhang,Zeyan Wang,Yuanyuan Liu,Xiaoyan Qin,Xiaoyang Zhang,Ying Dai,Baibiao Huang
A CdS–MoS2 photoelectrode with a double-layer core–shell structure was prepared using a simple electrodeposition–in situ sulfurization method on a Mo substrate. The photocatalytic activity of as-prepared electrodes was evaluated using a photoelectrochemical H2-generation experiment. The photocurrent and photon–electron conversion efficiency of the CdS–MoS2 photoelectrode were nearly double those of a CdS photoanode prepared on FTO glass. The high activity of the CdS–MoS2 photoelectrode was due to the higher separation efficiency of carriers caused by the formed CdS–MoS2 Janus heterojunction structure, which made directional transmission and electron–hole separation possible. Our experiments show that, in addition to being a good co-catalyst in powder material for photocatalytic hydrogen production, MoS2 can also be used as an electron acceptor layer to enhance electron–hole separation.
研究领域:
材料科学
·
能源科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xianglei Cao,Liugen Zhang,Tingxiang Chen,Chao Feng,Zechang Liu,Ying Qi,Wei Wang,Jide Wang
MOF based CdS-MoS 2 composite had strong photoresponse and rich catalytic sites because of the adjustable morphology and large specific surface area. The CdS-MoS 2 composite was synthesized by using the first synthesized Cd-MOF as the precursor. The hydrogen evolution activity was evaluated under simulated light source. The rate of photocatalytic hydrogen production can improve by 47 times for doping 2.5% (w/w) MoS 2 compare to pure CdS. The catalyst was analyzed by the UV/vis absorption spectra, photoluminescence spectra, time-resolved photoluminescence spectra, transient photocurrent responses, electrochemical impedance spectra, Mott-Schottky test, etc. The results revealed that the CdS-MoS 2 can greatly enhance the separation and transport efficiency of photogenerated carriers, and shift the position of conduction band for the catalyst, resulting significantly improve the production of hydrogen. This work provides a new strategy for manufacturing of photocatalyst by MOFs.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 44
·21078-21084
·
IF 3.925
Xing-Liang Yin,Lei-Lei Li,Yan-Lan Wang
An efficient and stable CdS@MoS2 core@shell heterostructure was prepared by using a facile solvothermal approach. The MoS2@CdS heterostructure reveals efficient charge separation, giving rise to excellent performance on H2 generation from photocatalytic lactic acid decomposition. Thanks to the MoS2 shell protection, CdS corrosion was significantly prohibited, thus resulting in the long-term photocatalytic stability of the CdS@MoS2 heterostructure. The corresponding charge transfer properties and catalytic mechanism have been analyzed and discussed in detail. The present study provides a novel insight into the design of high performance and cost-effective photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Banghao Du,Gongduan Fan,Shangwu Yang,Zhuoyi Chen,Jing Luo,Weiwei Yu,Junyi Yu,Qi Wei,Yushan Lu
Reactive oxygen species (ROS) play a considerable role in the catalytic reaction for removing organic pollutants, however, the generation and transformation mechanism by catalyst with light and ultrasonic irradiation still requires intensive investigation. In this study, a novel Er 3+ -CdS/MoS 2 (ECMS) composite was synthesized, and the synergetic degradation effects for 17β-estradiol (17β-E2) during the sonophotocatalytic (SPC) process were investigated. The contribution of ROSs for eliminating 17β-E2 during the SPC process through quenching experiments was generally ranked in the following order: superoxide radical (•O 2 − ) ≈ hole (h + ) > hydroxyl radical (•OH) > H 2 O 2 > singlet oxygen ( 1 O 2 ). •OH plays a crucial role in 17β-E2 removal by ECMS under sonocatalysis and photocatalysis conditions. The transformation process among ROSs was further analyzed and elucidated in the light of the probe measurement results with positive or negative correlation among ROSs. Besides, we observed a phenomenon that the generated concentration of •O 2 − rises first and then falls during the SPC process, which might be attributed to the formation of 1 O 2 via the oxidation of h + or recombination with •OH. This work clarifies the underlying mechanisms of sonophotocatalytic generation and transformation of ROSs in depth.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 24
·11934-11945
·
IF 3.925
Wenxuan Ma,Chenggong Zhang,Shuhua Hao,Yupeng Xing,Gang Zhao,Shipeng Qiu,Changwen Zhang,Xiaoke Wang
Developing semiconductor catalysts with high catalytic activity and good economic benefits is an important and challenging task in the field of photocatalysis. In this study, CdS nanosheets with a three-dimensional hollow structure were grown on MoS2 nanosheets by a hydrothermal method. The hydrogen production of the CdS@MoS2-25 wt% composites is 8.2 mmol in 3 h, which is 43.71 times that of pure CdS and 4.7 times that of Pt. Density functional theory (DFT) was used to further study the band structure of the composites. The experimental and calculation results show that the addition of co-catalyst MoS2 reduces the band gap of CdS and accelerates the transfer rate of photogenerated electrons. The construction of a n–n homogeneous structure reduces the interface transmission resistance of the carriers, and the photocatalytic performance of the composite material has been significantly improved. Therefore, the composite material is an excellent semiconductor photocatalyst that can replace precious metals in the reaction. In addition, after adding the promoter MoS2 to participate in the photocatalytic reaction for 12 h, the composite material still maintains high photocatalytic activity, and the recombination rate of photogenerated carriers is greatly reduced, which proves that the photocatalyst has good stability.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Yanfeng Wang,Wei Chen,Xiao Chen,Huajun Feng,Dongsheng Shen,Bin Huang,Yufeng Jia,Yuyang Zhou,Yuxiang Liang
CdS/MoS 2 , an extremely efficient photocatalyst , has been extensively used in hydrogen photoproduction and pollutant degradation . CdS/MoS 2 can be synthesized by a facile one-step hydrothermal process. However, the effect of the sulfur source on the synthesis of CdS/MoS 2 via one-step hydrothermal methods has seldom been investigated. We report herein a series of one-step hydrothermal preparations of CdS/MoS 2 using three different sulfur sources: thioacetamide, l -cysteine, and thiourea . The results revealed that the sulfur source strongly affected the crystallization, morphology, elemental composition and ultraviolet (UV)–visible-light-absorption ability of the CdS/MoS 2 . Among the investigated sulfur sources, thioacetamide provided the highest visible-light absorption ability for CdS/MoS 2 , with the smallest average particle size and largest surface area, resulting in the highest efficiency in Methylene Blue (MB) degradation. The photocatalytic activity of CdS/MoS 2 synthesized from the three sulfur sources can be arranged in the following order: thioacetamide > l -cysteine > thiourea . The reaction rate constants ( k ) for thioacetamide, l -cysteine, and thiourea were estimated to be 0.0197, 0.0140, and 0.0084 min −1 , respectively. However, thioacetamide may be limited in practical application in terms of its price and toxicity, while l -cysteine is relatively economical, less toxic and exhibited good photocatalytic degradation performance toward MB.
研究领域:
材料科学
·
环境化学
·
纳米催化
·
光催化
·
无机功能材料
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wei Zhao,Jincheng Liu,Zhongxiang Ding,Jinhong Zhang,Xiaoyu Wang
CdS nanophotocatalysts generally require precious metal Pt as a cocatalyst to enhance photocatalytic hydrogen production performance, but precious metal Pt reserves are scarce and expensive. Therefore, this study hopes to prepare CdS/MoS 2 (CM) composites by uniformly distributing MoS 2 nanosheets on the surface of CdS nanowires by a two-step method. After a series of tests, CM composite can expand the absorption range of visible light and improve the separation and transmittance of photogenerated electrons and holes. The results show the highest hydrogen production rate of 1.79 mmol•g −1 •h −1 was obtained with the CdS/MoS 2 ratio of 0.3, which is 35.8 times that of bare CdS nanowires. The excessive MoS 2 nanosheets will block light adsorption of CdS and inhibit the hydrogen production performance of the CM composite. This study provides a new research direction for finding cheap cocatalysts to replace precious metal Pt.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yiying Yue,Shuting Shen,Wanli Cheng,Guangping Han,Qinglin Wu,Jianchun Jiang
A novel photocatalytic hydrogel was prepared by the direct coagulation casting of CdS/MoS 2 /Montmorillonite (CMMt) and TEMPO-oxidized cellulose nanofiber (TOCN)-mediated polyacrylamide (PAM). The extremely high specific surface area of CdS/MoS 2 /Mt and the three-dimensional network-structured PAM-TOCN matrix contributed to the adsorption of tetracycline (TC) in wastewater treatment . The effect of the initial pH on the degradation of TC by PAM-TOCN-CMMt was analyzed, and its degradation rate reached 90.03% in 120 min at pH 7.5. In addition to being a visible-light-driven catalyst, CdS/MoS 2 /Mt acts as a reinforcing agent, and the tensile stress of PAM-TOCN-CMMt increased by 41% compared with that of PAM-TOCN. The compressive strength of TOCN-PAM-CMMt at an 80% strain level was 65% higher than that of PAM-TOCN. Thus, PAM-TOCN-CMMt, with high mechanical strength , offers multiple separations and recycling, and the TC removal rate is still more than 70.5% after five cycles. Moreover, the mechanism of TC degradation was proposed based on the photoelectric performance. The strong interaction between the CdS/MoS 2 heterojunction and the electronegative Mt is conducive to the effective separation and transportation of photogenerated electrons. The prepared nanocomposite hydrogels with a desirable catalytic degradation rate, mechanical strength, environmental friendliness , and recyclability are promising for the photodegradation of antibiotics.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Fukun Ma,Yongzhong Wu,Yongliang Shao,Yueyao Zhong,Jiaxin Lv,Xiaopeng Hao
CdS systems represent promising photocatalysts for hydrogen generation ; however, these systems are seriously restricted by inherent issues with photocorrosion. Here, the CdS photocorrosion process is prevented and a high stable and effective photocatalyst is obtained in the novel 0D/2D CdS/MoS 2 nanosheet composite system . According to crystallization kinetics , the CdS photocorrosion process will be prevented if the S elements resulting from photocorrosion can be reduced back to S 2− in the same photocatalytic system. So a photocorrosion-recrystallization strategy is proposed for the first time to resolve issues with photocorrosion when using CdS photocatalysts. Meanwhile, the recrystallized 0D/2D CdS/MoS 2 nanocomposite produces a high quantum efficiency of 23.03% (λ ex =420 nm), the evolution of hydrogen presents no notable activity losses for up to 400 h. Thus, the approach demonstrated here represents a promising method of designing and fabricating more stable and efficient composite chalcogenide photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 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）