INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Shanhu Liu,Bingyue Li,Santosh V. Mohite,Perumal Devaraji,Liqun Mao,Ruimin Xing
Developing earth-abundant and highly active bifunctional electrocatalysts are critical to advance sustainable hydrogen production via alkaline water electrolysis but still challenging. Herein, heterojunction hybrid of ultrathin molybdenum disulfide (MoS 2 ) nanosheets and non-stoichiometric nickel sulfide (Ni 0.96 S) is in situ prepared via a facile one-step hydrothermal strategy, followed by annealing at 400 °C for 1 h. Microstructural analysis shows that the hybrid is composed of intimate heterojunction interfaces between Ni 0.96 S and MoS 2 with exposed active edges provided by ultrathin MoS 2 nanosheets and rich defects provided by non-stoichiometric Ni 0.96 S nanocrystals . As expected, it is evaluated as bifunctional electrocatalysts to produce both hydrogen and oxygen via water electrolysis with a hydrogen evolution reaction (HER) overpotential of 104 mV at 10 mA cm −2 and an oxygen evolution reaction (OER) overpotential of 266 mV at 20 mA cm −2 under alkaline conditions, outperforming most current noble-metal-free electrocatalysts. This work provides a simple strategy toward the rational design of novel heterojunction electrocatalysts which would be a promising candidate for electrochemical overall water splitting.
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TALANTA
·
2020
·
IF 5.339
Chengji Sui,Qian Wang,Yunlei Zhou,Dingding Zhang,Huanshun Yin,Shiyun Ai
A sensitively homogeneous electrochemiluminescence (ECL) method was developed for 5-hydroxymethylcytosine (5hmC) detection using TiO 2 /MoS 2 /g-C 3 N 4 /GCE as substrate electrode, where g-C 3 N 4 was employed as the ECL active material, the MoS 2 nanosheets were used as co-catalyst, and TiO 2 was adopted as phosphate group capture reagent. To achieve the specific recognition and capture of 5hmC, the covalent reaction between –CH 2 OH and –SH was employed under the catalysis of HhaI methyltransferase, in which, –SH functionalized ferrocenedicarboxylic acid polymer (PFc-SH) was prepared as 5hmC capture reagent and ECL signal quencher. Then, based on the interaction between TiO 2 and phosphate group of 5hmC, the target was recognized and captured on electrode, resulting in a decreased ECL response due to the quenching effect of PFc-SH. Under optimal conditions, the biosensor presented the linear range from 0.01 to 500 nM with the detection limit of 3.21 pM (S/N = 3). The steric effect on electrode surface is a bottle-neck issue restricting devised biosensors advancement. In this work, the reaction between 5hmC and PFc was carried out in the solution, which can avoid steric effect on electrode surface to keep the high activity of enzyme. In addition, the biosensor was successfully applied to detect 5hmC in genomic DNA of chicken embryo fibroblast cells and different tissues of rice seedlings.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 20
·17688-17702
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IF 2.22
Liu Jun,Hui Qian,Chang Meng-Jie,Cui Wen-Na,Xi Tong,Wang Lin-Da,Sun Meng,Yuan Bin,Ni Fu-Rong
Herein, novel fibrous Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 is constructed by a simple one-step methodology for photocatalytic degradation of RhB dyes. Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 hybrid fibers were facilely prepared by direct hydrothermal growth of MoS 2 nanosheets on electrospun Bi 4 Ti 3 O 12 nanofiber surface, during which rod-like Bi 2 S 3 was formed by in-situ ion exchange reaction between BTO and S source. The MoS 2 nanosheets with several-layer thickness uniformly are coated both on the BTO and Bi 2 S 3 surface. Remarkable enhancement of visible light absorption and photo-generated charge separation in Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 are achieved compared with the bare BTO nanofibers. By changing the weight ratio of Mo/S and the precursor dosage of MoS 2 , the optimized BM-150/250 sample presents 2.3 and 4.1 times higher of the photodegradation efficiency and apparent reaction rate constant, respectively, than that of pure BTO fibers after 120-min irradiation under visible light. The system pays an efficient pathway to establish ternary composite fibers providing high photocatalytic activity for other electrospun Bi-contained nanofibers.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xiaoming Liu,Xueya Chen,Luping Xu,Binquan Wu,Xinman Tu,Xubiao Luo,Fang Yang,Jun Lin
A series of non-noble metal ultrathin MoS 2 nanosheets modified Mn 0.2 Cd 0.8 S heterostructured composites were prepared by an ultrasonic assisted hydrothermal synthesis process. Comparing with the pristine Mn 0.2 Cd 0.8 S composite, the obtained ultrathin MoS 2 /Mn 0.2 Cd 0.8 S composites exhibited a significantly improved photocatalytic activity for hydrogen evolution from water with visible light response. The optimized photocatalytic activity toward MoS 2 /Mn 0.2 Cd 0.8 S composite is around 8 times of the pristine Mn 0.2 Cd 0.8 S composite. Moreover, the ultrathin MoS 2 /Mn 0.2 Cd 0.8 S composites displayed good photocatalytic stability in the course of photochemical reaction . The excellent photocatalytic activity of the ultrathin MoS 2 /Mn 0.2 Cd 0.8 S composites might be attributed to the formed heterojunctions in composites itself and the sufficient active edge sites in MoS 2 phase. A possible photocatalytic mechanism was tentatively proposed. Considering its excellent photocatalytic activity and good photochemical stability, the obtained ultrathin MoS 2 /Mn 0.2 Cd 0.8 S composite has potential application in photocatalytic hydrogen evolution from water by using solar energy.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
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IF 7.1
Xiao Chang,Xurong Qiao,Kun Li,Ping Wang,Ya Xiong,Xiaofang Li,Fujun Xia,Qingzhong Xue
It is challenging for current metal oxides based acetone sensors to realize excellent ppb-level acetone sensing properties at low working temperature. Herein, the hollow ZnO/MoS 2 nanosheets (HZnO/MoS 2 ) core/shell heterogeneous structures are originally produced. Fast gas transport channels and n–p heterojunctions are produced by the decoration of MoS 2 nanosheets on HZnO surface, resulting in high acetone response and fast response/recovery speed. Ultraviolet (UV) light is introduced to further improve acetone response and drastically reduce working temperature. The light diffraction and reflection caused by the decoration of hierarchical MoS 2 nanosheets could significantly enhance light harvesting. Hence, the excellent acetone sensing properties are obtained by the synergistic effect of UV light and HZnO/MoS 2 core/shell heterogeneous structures. Exactly, at 100 °C, the HZnO/MoS 2 possesses a stable response (1.52) to 100 ppb acetone with UV irradiation while it exhibits no response to 100 ppb acetone without UV. Even at room temperature (30 ℃), UV activated HZnO/MoS 2 still exhibits a stable response (∼1.33) and fast recovery/recovery time (19 s/97 s) to 50 ppm acetone. Furthermore, the DFT calculations are performed to demonstrate the underlying acetone sensing mechanism. The results demonstrate that UV activated HZnO/MoS 2 heterostructure could achieve trace-acetone detection at low temperature.
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Solar RRL
·
2020
·Vol. 4
·期 6
·2000126
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IF 7.527
Hanjin Jiang,Hairui Fang,Dong Wang,Jianbo Sun
Due to its promising potential applications in seawater desalination and purification, solar steam conversion has attracted tremendous attention recently. The light-to-heat conversion capacity of solar absorbers directly affects the rate at which freshwater is produced by the evaporation system. Herein, an efficient double-layer evaporator is developed using MoS 2 /LaF 3 /PDMS ink as an absorber that is printed onto a commercial PTFE membrane by the controlled ink-spray method. The LaF 3 nanoparticles-decorated MoS 2 nanoflowers nanocomposite exhibits enhanced adsorption of sunlight due to semiconductor/solid electrolyte interface synergetic effect-induced broadband absorption ability. Combining the advantages of local heating and rapid vapor emission, the water evaporation rate of the evaporator with spray ink in sunlight is 1.76 kg m −2 h −1 and the corresponding high light-to-heat conversion efficiency is 91%. Also, the membrane module has good operability, certain mechanical strength, and good long-term stability. The synergistic effect of a rare-earth solid electrolyte and semiconductor provides new ideas for the design and development of materials with high light-to-heat conversion efficiency and good thermal stability.
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Catalysis Science & Technology
·
2019
·Vol. 10
·期 3
·788-800
·
IF 5.726
Rong Ji,Zhi Zhu,Wei Ma,Xu Tang,Yang Liu,Pengwei Huo
A new 2D/2D heterojunction of MoS2/CeO2 is successfully prepared by a facile hydrothermal method. The MoS2/CeO2 heterojunction demonstrates superior photocatalytic performance for the degradation of ciprofloxacin (CIP) to that of pure MoS2 and CeO2. The enhanced degradation efficiency of the MoS2/CeO2 heterojunction is on account of the 2D/2D structure, which not only accelerates the interfacial charge separation but also endows the heterojunction with numerous reactive sites to facilitate the degradation reaction. Meanwhile, the Ce4+ ions in 2D CeO2 serve as the redox centers and utilize the photogenerated carriers to generate more oxygen vacancies. In addition, this paper also carefully discusses the possible photocatalytic reaction mechanisms for the transfer behaviors of charge carriers, generation of reactive species and intermediate degradation products by electrochemical impedance spectroscopy (EIS), electron spin resonance (ESR) and HPLC-MS analysis. This work may provide a promising approach for synthesizing 2D/2D heterojunctions in photocatalytic degradation.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yi Qu,Xiao Song,Xi Chen,Xiang Fan,Guan Zhang
Charge transfer efficiency of semiconductor photoanode in photoelectrochemical (PEC) system is one of crucial factor determining the overall PEC performance. Previously, we have developed a MoS 2 -based PEC system that is able to specifically convert ammonia nitrogen in aqueous solution into gaseous nitrogen (e.g. N 2 ) utilizing oxysulfur radicals. Herein, in order to solve the slow charge transfer issue of reported MoS 2 -based PEC oxidation system, we further improve the PEC conversion efficiency by tuning composition of MoS 2 /WS 2 nanosheets heterojunction photoanode. The hybrid MoS 2 /WS 2 (1:1) electrode displays the highest PEC performance and ammonia conversion efficiency compared to the individual MoS 2 or WS 2 constituent under visible light irradiation, which can be mainly ascribed to the reduced electrode resistance and improved charge transfer efficiency according to the physiochemical, electrochemical and spectroscopic analysis. The results prove that both interfacial and interior charge carrier transfer processes of photoanode are crucial and tailorable in order to efficiently generate reactive radical species for ammonia conversion.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Zhihao Wu,Danyang Nan,Huan Yang,Shuang Pan,Hui Liu,Xiaoli Hu
A facile ratiometric fluorescence method for ascorbic acid (AA) detection was established by combining the fluorescence of MoS 2 quantum dots (QDs) with second-order scattering (SOS) of CoOOH. In MoS 2 QDs/CoOOH nanohybrid system, the fluorescence of MoS 2 QDs was quenched by CoOOH whereas the intensity of SOS was relatively close to the fluorescence due to the intrinsic high scattering ability of large size CoOOH nanoflakes . With the addition of AA, CoOOH nanoflakes were reduced to Co 2+ accompanied the size decline and the disappearance of characteristic absorption in UV–vis spectrum, resulting in the fluorescence recovery and SOS fading. Thus, the ratiometric detection of AA was obtained through the opposite changes of fluorescence and SOS. Under optimized conditions, the detection limit of AA was 0.21 μmol L −1 with a linear range from 0.80 to 32.0 μmol L −1 . Furthermore, the MoS 2 QDs/CoOOH nanohybrid system was applied to the detection of AA in human serum samples and vitamin C tablets with satisfactory results.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yiming Tang,Zexiao Zheng,Xianglin Sun,Xukai Li,Laisheng Li
Ternary CdS-MoS 2 coated ZnO nanobrush photoelectrode from chemical bath deposition was successfully fabricated on a FTO substrate for photocatalytic degradation of amoxicillin. The vertically grown ZnO core on FTO substrates provided a direct pathway for electron transfer; while the well-crystallized CdS/MoS 2 shell offered effective visible light absorption and increased active sites. Prolonged lifetime of charge carriers was demonstrated by transient photovoltage (TPV) measurement. The ternary brush-type electrode exhibited enhanced photoelectrochemical performance with a photocurrent density of 20.32 mA/cm 2 at 0 V vs . Ag/AgCl under visible light illumination (λ ≧ 420 nm), which was 5.2 times, 1.8 times and 3.6 times of that of pristine CdS, CdS-MoS 2 film and ZnO/CdS nanobrush, respectively. The improved photoelectrochemical activity was ascribed to the enhancement of light absorption, appropriate band alignment and prolonged charge carriers’ lifetime. The ZnO/CdS-MoS 2 nanobrush film degraded 94% of amoxicillin in 60 min, exhibiting promising photocatalytic activity under visible light illumination (λ ≧ 420 nm). The reusability and stability of the electrode were evaluated by recycling experiments. The intermediates of amoxicillin oxidation were also identified and the degradation pathway was proposed.
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Foods
·
2023
·Vol. 12
·期 23
·4363
·
IF 5.2
Zhiping Yu,Chengqiang Li,Jiashuai Sun,Xia Sun,Guodong Hu
The accumulation of pesticide residues poses a significant threat to the health of people and the surrounding ecological systems. However, traditional methods are not only costly but require expertise in analysis. An electrochemiluminescence (ECL) aptasensor was developed using chitosan and molybdenum disulfide (CTS-MoS2), along with acetylene black (AB@CTS) for the rapid detection of malathion residues. Due to the weak interaction force, simple composite may lead to uneven dispersion; MoS2and AB were dissolved in CTS solution, respectively, and utilized the biocompatibility of CTS to interact with each other on the electrode. The MoS2nanosheets provided a large specific surface area, enhancing the utilization rate of catalytic materials, while AB exhibited excellent conductivity. Additionally, the dendritic polylysine (PLL) contained numerous amino groups to load abundant luminol to catalyze hydrogen peroxide (H2O2) and generate reactive oxygen species (ROS). The proposed ECL aptasensor obtained a low detection limit of 2.75 × 10−3ng/mL (S/N = 3) with a good detection range from 1.0 × 10−2ng/mL to 1.0 × 103ng/mL, demonstrating excellent specificity, repeatability, and stability. Moreover, the ECL aptasensor was successfully applied for detecting malathion pesticide residues in authentic samples with recovery rates ranging from 94.21% to 99.63% (RSD < 2.52%). This work offers valuable insights for advancing ECL sensor technology in future applications.Keywords:electrochemiluminescence;aptamer;CTS-MoS2;AB@CTS;PLL-luminol;nano gold
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Small
·
2023
·
IF 13.3
Mengxia Shen,Jiale Qi,Xinyu Xu,Jinbao Li,Yongjian Xu,Hao Yang,Kun Gao,Jianfeng Huang,Jiayin Li,Zhen Shang,Yonghao Ni
Multi-component composite materials with a magnetic-dielectric synergistic effect exhibit satisfactory electromagnetic wave absorption performance. However, the effective construction of the structure for these multi-component materials to fully exploit the advantages of each component remains a challenge. Inspired by natural biomass, this study utilizes wood as the raw material and successfully prepares high-performance MoS 2 @Gd 2 O 3 /Mxene loaded porous carbon aerogel (MGMCA) composite material through a one-pot hydrothermal method and carbonization treatment process. With a delicate structural design, the MGMCA is endowed with abundant heterogeneous interface structures, favorable impedance matching characteristics, and a magnetic-dielectric synergistic system, thus demonstrating multiple electromagnetic wave loss mechanisms. Benefiting from these advantages, the obtained MGMCA exhibits outstanding electromagnetic wave absorption performance, with a minimum reflection loss of −57.5 dB at an ultra-thin thickness of only 1.9 mm. This research proposes a reliable strategy for the design of multi-component composite materials, providing valuable insight for the design of biomass-based materials as electromagnetic wave absorbers.
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