CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Ying Dong,Chuixiu Huang,Xiao-Yu Yang
Intrinsic wettability of atomically thin solids has a great impact on science and technology. Herein, the wetting property of liquid-exfoliated molybdenum disulfide (MoS 2 ) was investigated. The prepared MoS 2 nanosheets can be well dispersed in nonpolar (1,2-dichloroethane and 1-dodecanol) and polar (water-ethanol cosolvent) solvents. Similarly, the MoS 2 -coated fabric shows excellent underwater superoleophobic and underoil superhydrophobic properties. Taking advantage of the unusual intrinsic wettability, few-layered MoS 2 demonstrates the great potential in on-demand oil-water separation.
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Results in Physics
·
2018
·
IF 2.147
Wenqiang Su,Ping Wang,Zhengyang Cai,Junhe Yang,Xianying Wang
Molybdenum disulfide (MoS 2 ) has shown its promising performance for use as an electrocatalyst for hydrogen evolution reaction (HER). However, it has commonly suffered from limited edge active sites and stagnant conductivity in this regard. Therefore in the present work, with integrating graphene aerogel (GA) supporting and Al ions doping, we report for the first time one-pot hydrothermal synthesis of Al-doped MoS 2 @GA aerogel electrocatalysts with 3D porous network architecture. Vertical MoS 2 ultrathin nanosheets with defect-rich structure are grown on graphene nanosheets at the optimum weight ratio of 5 wt% GA, leading to the enhancement of HER activity. Simultaneously Al doping of 0.77 at% further optimizes the number of exposed active sites and conductivity. The overpotential at a current of 10 mA·cm −2 was successfully reduced to 212 mV with a Tafel slope value down to 41 mV/dec, benefiting from synergistically structural and electronic modulating of MoS 2 . The study thus sheds light on designing and developing high-performance 3D network electrocatalysts for HER reaction.
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Nanoscale
·
2019
·Vol. 11
·期 22
·10992-11000
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IF 6.97
Junmei Liang,Chaoying Ding,Jiapeng Liu,Tao Chen,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
The hydrogen evolution reaction (HER) in alkaline media is key for the cathodic reaction of electrochemical water splitting, but it suffers sluggish kinetics due to the slow water dissociation process. Here, we present a simple strategy to enhance the HER activity in alkaline media by engineering Co-doped MoS2 coupled with Mo2CTx MXene. The improved HER activity might be ascribed to the synergistic regulation of water dissociation sites and electronic conductivity. Co doping could effectively regulate the electronic structure of MoS2 and further improve the intrinsic activity of the catalyst. Mo2CTx MXene served as both the active and conductive substrate to facilitate electron transfer. As a result, the Co-MoS2/Mo2CTx nanohybrids showed dramatically enhanced HER performance with a low overpotential of 112 mV at a current density of 10 mA cm−2 and exhibited excellent long-term stability in alkaline media.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Xiang Fan,Yurou Zhou,Guan Zhang,Tongzhou Liu,Wenyi Dong
The advanced oxidation processes (AOPs) based on oxysulfur radicals (SO 3 − , SO 4 − and SO 5 − ) has been receiving growing attention in wastewater treatment. In this study, we report the in situ photoelectrochemical activation of sulfite to produce oxysulfur radicals with MoS 2 nanosheets as a wide spectrum absorptive photoanode. At alkaline condition, the selective and efficient conversion of ammonia to dinitrogen was exclusively achieved in the presence of sulfite electrolyte under visible light irradiation. The sulfite plays multiple roles such as working as hole scavenger for improving stability of MoS 2 electrode by inhibiting photo-corrosion and serving as precursor of oxysulfur radicals in the meantime. The influences of radical scavenger, dissolved oxygen and electrolyte on the photoelectrochemical, electrochemical and photochemical conversion of ammonia verified that oxysulfur radicals are more powerful than hydroxyl radicals in terms of ammonia conversion. The proposed system appears to be applicable to in situ treatment of wastewater containing of ammonia and sulfite pollutants, such as wastewater from ammonia-absorption-desulfurization of combustion smoke. This work also provides a new protocol in the design of new AOPs, where oxysulfur radicals can work together with hydroxyl radicals for simultaneous pollutants degradation and detoxification.
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JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Jingyi Wu,Hongxia Zeng,Qingxuan Shi,Xiongwei Li,Qing Xia,Zhigang Xue,Yunsheng Ye,Xiaolin Xie
Uncontrollable lithium (Li) dendrite growth has hampered the application of lithium metal batteries (LMBs). Herein, a novel plastic crystal composite polymer electrolyte (nh-CPE) consisting of multifunctional two-dimensional (2D) molybdenum disulfide (MoS 2 ) and ion-conducting one-dimensional (1D) surfactant oxidized cellulose nanocrystal (OCNC) is developed to overcome this challenge. The nh-CPE possesses good Li-dendrite-suppressing ability, which is attributed to the well-designed three-dimensional (3D) ion conducting network constructed by homogeneously dispersed MoS 2 and OCNC. This structure facilitates Li-ion conductivity and enables uniform Li deposition on the anode. Moreover, the impermeable MoS 2 nano-flakes with excellent mechanical strength serve as physical barriers to hold the electrolyte-electrode interface stability and consequently block Li dendrite growth and enhance fire retardancy. When applied in LMB, the nh-CPE exhibits excellent cycle performance and rate capability, with 90% capacity retention after 200 cycles at 0.5 C and 60 °C, and a discharge capacity of 128 mAh g −1 at 1 C. Notably, owing to high room-temperature ionic conductivity (0.8 mS cm −1 ), the cell with nh-CPE cycled at room temperature delivers an initial discharge capacity of 144 mAh g −1 . The outstanding performance and simple process offer great opportunity to promote Li-dendrite-suppressing LMBs for practical application.
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Journal of Materials Chemistry A
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2015
·Vol. 3
·期 31
·16337-16347
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IF 7.443
Shengjie Xu,Zhouyue Lei,Peiyi Wu
In this paper, 3D porous MoS2/MoSe2 nanosheet–graphene networks were successfully prepared by a simple mixing solvothermal treatment. The resulting products possessed highly conductive graphene networks on which highly exfoliated MoS2/MoSe2 nanosheets were decorated. This hybrid 3D architecture facilitated loading of 2D nanosheets (including some 0D quantum dots), exposure of active sites, and improvement of electron transfer between the electrode and the catalysts. The highly exfoliated and defect-rich structure of MoS2/MoSe2 nanosheets endowed these composites with plentiful active sites for the electrocatalysis of the hydrogen evolution reaction (HER). The MoSe2 sample exhibited remarkable activity for the HER with a very small overpotential of approximately 70 mV and a low Tafel slope of 61 mV per dec, as well as excellent long-term durability. Moreover, due to the facile and relatively low-cost preparation method, our work might develop promising candidates for Pt-free HER catalysts for future commercial applications and provide an alternative facile approach to fabricate other layered materials confined in graphene hybrid 3D networks on a large scale.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Jianbo Ye,Weixiang Chen,Qiannan Chen,Zheting Yu,Jim Yang Lee
The MoS 2 /graphene composites were synthesized by a hydrothermal route in the presence of graphene oxide sheets with assistance from poly(diallyldimethylammonium chloride) (PDDA). The results of characterizations show that the MoS 2 /graphene composites exhibit a graphene-like morphology with interconnected network, in which single- or few-layer MoS 2 sheets are homogenously dispersed and well anchored on the graphene surface. The robust heterostructure and morphology of MoS 2 /graphene composites can not only provide more sites and channels for lithium ion accommodation and diffusion, but also facilitate electrolyte access. The heterostructure also maximizes the synergistic effects between MoS 2 and graphene. Therefore, MoS 2 /graphene composites exhibit significantly improved electrochemical performances for reversible lithium storage. In particular, the MoS 2 /graphene composite prepared with monomer concentration of PDDA being 0.02 mol L −1 exhibits a reversible capacity of 1100 mA h g −1 with enhanced rate capability. The reversible capacity of 856 mA h g −1 after 900 cycles at 500 mA g −1 can be remained, indicating its excellent cyclic stability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
·
IF 4.233
Yanjia Yu,Junmin Wan,Ziang Yang,Zhiwen Hu
A novel route for synthesis of MoS 2 /TiO 2 /hollow microfibers (HMFs) ternary composite photocatalyst using sol-gel method combined with high temperature calcination under a nitrogen circumstances was reported for the first time. The morphology, structure and optical properties of the novel MoS 2 /TiO 2 /HMFs photocatalysts were fully characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), specific surface area (BET) and thermogravimetric analysis (TG). The photocatalytic activities were evaluated by photodegradating Methylene blue (MB) and Rhodamine B (RB) under visible light irradiation. The results showed the MoS 2 /TiO 2 /HMFs ternary composite hollow microfibre photocatalysts had a purification of more than 98.7% for MB and RB of simulating wastewater, and acquired the superior synergistic effect of adsorption and catalysis for organic pollutants . That’s because the sensitization of MoS 2 enlarged the wavelength response range to the visible region of the solar spectrum , the HMFs could beneficially increase adsorption capability for organic pollutants, and the mixed crystalline phase of TiO 2 accelerated the decomposition of organic pollutant. A detailed study of involved active species unraveled the mechanism regarding photocatalysis . So, the synergistic photocatalytic effect of HMFs, TiO 2 and MoS 2 was very important and significant for wastewater treatment or prevention of air pollution.
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Nanoscale
·
2016
·Vol. 8
·期 21
·11052-11059
·
IF 7.76
Aiping Wu,Chungui Tian,Haijing Yan,Yanqing Jiao,Qing Yan,Guoyu Yang,Honggang Fu
A low-cost catalyst for the hydrogen evolution reaction (HER) over a broad pH range is highly desired to meet the practical needs in different areas. In this study, hierarchical flower-like MoS2@MoP core–shell heterojunctions (HF-MoSP) are designed as a promising catalyst for HER over a broad pH range. The materials are obtained by the controllable phosphidation of the hierarchical MoS2 flower (HF-MoS2) composed of thin silk belt-like sheets. The phosphidation degree, P/S ratio and work function (WF) of HF-MoSP can be tuned easily over broad range by changing the phosphidation temperature. Under optimized condition, HF-MoSP exhibits excellent electrocatalytic activity for HER with a low onset overpotential of 29 mV and η of 108 mV at 10 mA cm−2 in 0.5 M H2SO4 and retains its good activity for 30 h. In addition, the catalyst shows excellent activity in 1 M KOH with an onset overpotential of 42 mV and η of 119 mV at 10 mA cm−2. The catalysts also exhibit obvious activity in neutral, weak acid and weak alkaline conditions. The good performance is relative to the synergy of the MoP shell and MoS2 core and the high WF of HF-MoSP close to Pt, and the large SBET of HF-MoSP benefited from the hierarchical structure. This study represents the construction of the core–shell heterojunction and provides a new way to provide the low-cost and high-performance catalyst for HER.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 14
·6700-6708
·
IF 3.269
Huimin Zhao,Yaxi Li,Bing Tan,Yaobin Zhang,Xiaochi Chen,Xie Quan
To improve the peroxidase-like activity of molybdenum dichalcogenides (MoS2), surface modification, such as combing with monometallic or bimetallic nanoparticles, is of great and widespread interest. However, only a few studies have been reported on the modification of MoS2 with non-metallic materials. Herein, we report a study on the peroxidase-like activity of novel PEGylated MoS2 (PEG-MoS2) nanosheets prepared using a simple liquid-phase exfoliation and pegylation process. Compared to the undecorated MoS2 nanosheets, PEG-MoS2 nanosheets have improved water dispersiblity and stability, which are beneficial for improving the peroxidase-like activity, as well as the catalysis velocity and affinity for TMB or H2O2. Based on PEGylated MoS2, we successfully established a new platform for the colorimetric detection of H2O2 with a limit of detection (LOD) of 1.18 μM, which is comparable to that of the majority of the reported enzyme mimics of inorganic graphene analogues. More importantly, the as-prepared PEG-MoS2 nanosheets are environmentally friendly, water dispersible, low cytotoxic, and easily prepared, which indicate that PEG-MoS2 is a type of promising enzyme mimics and extremely likely to be applied in cell-based assay systems without any adverse reactions.
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SYNTHETIC METALS
·
2016
·
IF 2.299
Gang Fu,Li Ma,Mengyu Gan,Xiuling Zhang,Meng Jin,Yao Lei,Peishu Yang,Maofa Yan
This research paper describes a facile strategy to synthesize the novel 3D Spongia-shaped polyaniline/MoS 2 nanospheres composite under the addition of polyvinylpyrrolidone (PVP) (named sPANI/A-MoS 2 ), and this composite displays excellent electrochemical properties as an electrode material for supercapacitors. The structure and morphology of the as-prepared 3D sPANI/A-MoS 2 are characterized by scanning electron microscopy (SEM), Fouriertransform infrared (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), Raman spectroscopy measurements and Thermogravimetric Analysis (TGA). Cyclic voltammograms (CV) and galvanostatic charging/discharging (GCD) tests are adopted to evaluate the electrochemical performances of the composite. All the results powerfully demonstrate the successful fabrication of 3D sPANI/A-MoS 2 . The maximum specific capacitance of this composite reaches up to 605 F g −1 at a current density of 1 A g −1 , and the energy density of 53.78 Wh kg −1 is obtained at a power density of 0.4 kW kg −1 . Notably, the capacity retention of the as-fabricated sPANI/A-MoS 2 composite electrode can maintain 88.6% (well above 59.8% for sPANI) after constant charge-discharge 1000 cycles, showing an excellent electrochemical stability.
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ULTRASONICS SONOCHEMISTRY
·
2016
·
IF 4.556
Ling-Xia Zuo,Li-Ping Jiang,Jun-Jie Zhu
For the alkaline fuel cell cathode reaction, it is very essential to develop novel catalysts with superior catalytic properties. Here, we report the synthesis of highly active and stable MoS 2 /Pd composites for the oxygen reduction reaction (ORR), via a simple, eco-friendly sonochemical method. The bulk MoS 2 was first transformed into single and few layers MoS 2 nanosheets through ultrasonic exfoliation. Then the exfoliated MoS 2 nanosheets served as supporting materials for the nucleation and further in-situ growth of Pd nanoparticles to form MoS 2 /Pd composites via ultrasonic irradiation. Cyclic voltammetry and rotating disk voltammetry measurements demonstrate that as-prepared MoS 2 /Pd composites which provides a direct four-electron pathway for the ORR, have better electrocatalytic activity , long-term operation stability than commercial Pt/C catalyst. We expect that the present work would provide a promising strategy for the development of efficient oxygen reduction electrocatalyst . In addition, this study can also be extended to the preparation of other hybrid with desirable morphologies and functions.
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