Search query: MoS2 AND evaporation AND nanowires

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abstract: Cocatalysts play a significant role in accelerating the catalytic reactions of semiconductor photocatalyst. In particular, a semiconductor assembled with dual cocatalysts, i.e. reduction and oxidation cocatalysts, can obviously enhance photocatalytic performance because of the synergetic effect of fast consumption of photogenerated electrons and holes simultaneously. However, in most cases, the noble metal cocatalysts are employed, which tremendously increases the cost of the photocatalysts and restricts its large scale application. Herein, on the platform of one dimensional (1D) CdS nanowires, we have utilized the earth abundant dual cocatalysts, MoS2 and cobalt phosphate (Co Pi) to construct the CdS@MoS2@Co Pi (CMC) core shell hybrid photocatalysts. In this dual cocatalysts system, Co Pi is in a position to expedite the migration of holes from CdS, while MoS2 acts as electron transporter as well as active sites to accelerate the surface water reduction reaction. Taking the advantages of the dual cocatalyst system, the prepared CMC hybrid shows obvious enhancement of both photoactivity and photostability toward hydrogen production compared with bare 1D CdS nanowire and binary hybrids (CdS@MoS2 and CdS@Co Pi) This work highlights the promising prospects for rational utilization of earth abundant dual cocatalysts to design low cost and efficient hybrids toward boosting photoredox catalysis.
author_names: K Q Lu

Ming-Yu Qi

Zi-Rong Tang

Yi-Jun Xu
title: Earth Abundant MoS2 and Cobalt Phosphate Dual Cocatalysts on 1D CdS Nanowires for Boosting Photocatalytic Hydrogen Production.
venue: Langmuir the ACS journal of surfaces and colloids
year: 2019

abstract: Recently, a green process, named "air water interfacial solar heating" has been employed for seawater desalination to avoid high energy consumption as in the conventional thermal distillation process. In this work, a MoS2 based solar evaporator (MSE) was designed for both efficient solar water evaporation and clean freshwater collection based on the new process. The MSE was composed of a top layer of MoS2 nanoflowers for high solar absorption and organic contaminant removal, a thermal barrier layer of expandable polyethylene (EPE) foam for floatation and excellent heat insulation, and a seawater pumping channel of air laid paper (ALP) for fast water delivery to the MoS2 top layer. The water evaporation rates of the MSE were significantly enhanced to 1.27, 1.95 and 5.90 kg m 2 h 1 under 1, 2 and 5.5 sun solar irradiance respectively, corresponding to 3.8, 5.3, and 11.2 times faster rates than that of water evaporation itself. The MSE was shown to have excellent stability and durability as there was no decrease in the water evaporation rate during 23 cycles of use within 210 days. In addition, it was demonstrated that model organic pollutants including nitrobenzene, carbamazepine and naproxen could be well removed by the MSE, resulting in the production of clean condensed freshwater. Finally, a real seawater desalination experiment also revealed that the water quality of freshwater could be enhanced by the MSE. This work not only developed a new solar evaporator for seawater desalination, but also extended its application scope from seawater to other polluted water bodies.
author_names: Rong-Qin Chen

Xun Wang

Qimao Gan

Tuqiao Zhang

Kehang Zhu

Miaomiao Ye
title: A bifunctional MoS2 based solar evaporator for both efficient water evaporation and clean freshwater collection
year: 2019

abstract: Metallic 1T phase MoS2 is a newly emerging and attractive catalyst since it has more available active sites and high carrier mobility in comparison with its widely used counterpart of semiconducting 2H MoS2. Herein, 1T/2H MoS2(N) (N: MoO3 nanowires were used to prepare 1T/2H MoS2) was synthesized by using molybdenum trioxide (MoO3) nanowires as the starting material and applied in the photodegradation of antibiotic residue in water. Enhanced photocatalytic performance was observed on the obtained 1T/2H MoS2(N) which was 2.8 and 1.3 times higher than those on 1T/2H MoS2(P) (P: commercial MoO3 powder was used to prepare 1T/2H MoS2) and 2H MoS2, respectively. The active component responsible for the photodegradation was detected and a reaction mechanism is proposed.
author_names: Wan He Zhao

Xin Liu

Xiuru Yang

Chunxi Liu

Xiaoxiao Qian

Tao Sun

Wenya Chang

Jingjing Zhang

Zhi Chen
title: Synthesis of Novel 1T/2H MoS2 from MoO3 Nanowires with Enhanced Photocatalytic Performance
venue: Nanomaterials
year: 2020

abstract: Molybdenum disulfide (MoS2 is a promising electrode material for electrochemical energy storage owing to its high theoretical specific capacity and fascinating 2D layered structure. However, its sluggish kinetics for ionic diffusion and charge transfer limits its practical applications. Here, a promising strategy is reported for enhancing the Na+ ion charge storage kinetics of MoS2 for supercapacitors. In this strategy, electrical conductivity is enhanced and the diffusion barrier of Na+ ion is lowered by a facile phosphorus doping treatment. Density functional theory results reveal that the lowest energy barrier of dilute Na vacancy diffusion on P doped MoS2 (0.11 eV) is considerably lower than that on pure MoS2 (0.19 eV) thereby signifying a prominent rate performance at high Na intercalation stages upon P doping. Moreover, the Na vacancy diffusion coefficient of the P doped MoS2 at room temperatures can be enhanced substantially by approximately two orders of magnitude (10 6 10 4 cm2 s 1 compared with pure MoS2 Finally, the quasi solid state asymmetrical supercapacitor assembled with P doped MoS2 and MnO2 as the positive and negative electrode materials, respectively, exhibits an ultrahigh energy density of 67.4 W h kg 1 at 850 W kg 1 and excellent cycling stability with 93.4% capacitance retention after 5000 cycles at 8 A g 1
author_names: Shude Liu

Ying Yin

Musheng Wu

Kwan San Hui

Kwun Nam Hui

Chuying Ouyang

Seong Chan Jun
title: Phosphorus Mediated MoS2 Nanowires as a High Performance Electrode Material for Quasi Solid State Sodium Ion Intercalation Supercapacitors.
venue: Small
year: 2019

abstract: The controlled construction of hierarchical electrodes that overcome the single contribution of pure materials and create an interface effect between structures to enhance the electrochemical performance of supercapacitors is highly desirable. In this study, hydrothermally prepared NiMoO4 nanowires were treated via a facile vapor phase sulfurization method, forming a 1D hierarchical core shell porous configuration that in situ wrapped an NiS2/MoS2 nanosheet shell on the NiMoO4 core, which provides more accessible sites for faradaic reactions and abundant charge transfer channels in innumerable hetero interfaces with defects. The as obtained NiMoO4@NiS2/MoS2 sample exhibited a high specific capacity of 437 C g 1 (970 F g 1) at a current density of 5 A g 1, excellent rate capability (a high capacity retention of 320 C g 1 at the high current density of 20 A g 1) and excellent electric conductivity. Furthermore, the NiMoO4@NiS2/MoS2 composite and activated carbon were employed to assemble an asymmetric supercapacitor, which delivered a high energy density of 26.8 W h kg 1 at a power density of 700 W kg 1.
author_names: Duo Chen

Mengjie Lu

La Li

Dong Cai

Junzhi Li

Junming Cao

Wei Han
title: Hierarchical core shell structural NiMoO4@NiS2/MoS2 nanowires fabricated via an in situ sulfurization method for high performance asymmetric supercapacitors
year: 2019

abstract: Advanced intelligent electronic systems are usually integrated with a power supply, sensors and many other components, which can lead to their bulky sizes and complex structures. Here, we introduce a smart self powered device concept that exploits a type of Jaboticaba like carbon nanosphere@TiO2 nanowire (C@T) as a highly efficient, light sensitive liquid (including but not limited to water, methanol, acetone, and ethanol) evaporation power generation (EPG) platform. Typically, the separate piece EPG device could generate a flow induced voltage (FIV) of 1.6 V under the evaporation of water, which was comparable to that of a commercial dry battery. When methanol was used, FIV was as high as 2.0 V. The FIV value of the EPG device using water could be easily scaled up to nearly 20 V and used for a stable power source in electronic devices. The photoresponse performance is an exclusive feature of EPG, which was successfully applied to a self powered light control switch. The significance of this work is that it not only provides a satisfactory and practical candidate for cheap and efficient evaporation power generation, but also opens up a green way for building advanced intelligent self powered electronics.
author_names: Bingxue Ji

Nan Chen

Changxiang Shao

Qianwen Liu

Jian Gao

Tong Xu

Huhu Cheng

Liangti Qu
title: Intelligent multiple liquid evaporation power generation platform using distinctive Jaboticaba like carbon nanosphere@TiO2 nanowires
year: 2019

abstract: Achieving fast and stable Li ion energy storage in two dimensional MoS2 materials has become a formidable challenge due to their sluggish electrochemical reaction kinetics and large structural change. In this study, a rational synthesis approach based on the nanoconfinement effect is reported to construct MoS2@C/MoS2 nanowires with a unique core sheath configuration. The nanocomposite exhibits a great surface area of 170.1 m2 g 1, mesoporous nanotexture, along with expanded MoS2 interlayers. The porous core sheath architecture and the electrically conductive carbon are of great benefit for swift transportation of Li ions/electrons to enable enhanced reaction kinetics, and supply a great number of electroactive sites for more efficient energy storage. Additionally, the outer carbon nanoshells could maintain the structure integrity of the nanocomposite after a long term cycle test. As a consequence, the MoS2@C/MoS2 nanowire anodes exhibit a high reversible capacity of 443 mA h g 1 at 10 A g 1 (53.2% retenti.
author_names: Huan-huan Sun

Jian-Gan Wang

Xiaozhi Zhang

Chong-Wei Li

Fei Liu

Wenjie Zhu

Weibo Hua

Yueying Li

Minhua Shao
title: Nanoconfined Construction of MoS2@C/MoS2 Core Sheath Nanowires for Superior Rate and Durable Li Ion Energy Storage
venue: ACS Sustainable Chemistry Engineering
year: 2019

abstract: Abstract There is an ever increasing demand for rechargeable batteries with fast charging, long cycling, high safety, and low cost in new energy storage systems. Herein, a heterogeneous architecture composed of MoS2 coupled carbon nanosheets encapsulated on sodium titanate nanowires is developed and demonstrated as an advanced anode for sodium ion batteries (SIBs) Owing to the synergistic effects of ultrastable substrate of 1D sodium titanate (NTO) nanowires, high capacity promoter of 2D MoS2 nanosheets as well as the 2D conductive carbon matrix, the resulting 1D/2D 2D hybrid demonstrates excellent high rate capacity and super durable cyclability, delivering a stable capacity of up to 425.5 mAh g 1 at 200 mA g 1. Even at an ultrafast charging/discharging process within 80 s, the capacity can be maintained at 201 mAh g 1 after 16 000 cycles with only 0.0012% capacity loss per cycle, one of the best high rate capacities and cyclabilities for NTO based hybrid composites. The present work highlights the designing protocol of hierarchical nanoarchitectures with stable substrate and high capacity electrodes for next generation energy storage applications.
author_names: Shitong Wang

Fangjun Cao

Yutong Li

Zhongtai Zhang

Daming Zhou

Yong Yang

Zilong Tang
title: MoS2 Coupled Carbon Nanosheets Encapsulated on Sodium Titanate Nanowires as Super Durable Anode Material for Sodium Ion Batteries
venue: Advanced science
year: 2019

abstract: Sodium ion batteries (SIBs) are considered a prospective candidate for large scale energy storage due to the merits of abundant sodium resources and low cost. However, a lack of suitable advanced anode materials has hindered further applications. Herein, metal semiconductor mixed phase twinned hierarchical (MPTH) MoS2 nanowires with an expanded interlayer (9.63 A) are engineered and prepared using MoO3 nanobelts as a self sacrificed template in the presence of a trace amount of (NH4 )6 Mo7 O24 *4H2 O as initiator. The greatly expanded interlayer spacing accelerates Na+ insertion/extraction kinetics, and the metal semiconductor mixed phase enhances electron transfer ability and stabilizes electrode structure during cycling. Benefiting from the structural merits, the MPTH MoS2 electrode delivers high reversible capacities of 200 mAh g 1 at 0.1 A g 1 for 200 cycles and 154 mAh g 1 at 1 A g 1 for 2450 cycles in the voltage range of 0.4 3.0 V. Strikingly, the electrode maintains 6500 cycles at a current density of 2 A g 1 corresponding to a capacity retention of 82.8% of the 2nd cycle, overwhelming the all reported MoS2 cycling results. This study provides an alternative strategy to boost SIB cycling performance in terms of reversible capacity by virtue of interlayer expansion and structure stability.
author_names: Wei Ye

Fang-fang Wu

Nianxiang Shi

Hang Zhou

Qianqian Chi

Weihua Chen

Shiyu Du

Peng Gao

Haibo Li

Shenglin Xiong
title: Metal Semiconductor Phase Twinned Hierarchical MoS2 Nanowires with Expanded Interlayers for Sodium Ion Batteries with Ultralong Cycle Life.
venue: Small
year: 2019

abstract: The ability to design and enhance the nonlinear optical responses in two dimensional (2D) transition metal dichalcogenides (TMDCs) is both of fundamental interest and highly desirable for developing TMDC based nonlinear optical applications, such as nonlinear convertors and optical modulators. Here, we report for the first time a strong anisotropic enhancement of optical second harmonic generation (SHG) in monolayer molybdenum disulfide (MoS2) by integrating with one dimensional (1D) titanium dioxide nanowires (NWs) The SHG signal from the MoS2/NW hybrid structures is over 2 orders of magnitude stronger than that in the bare monolayer MoS2. Polarized SHG measurements revealed a giant anisotropy in SHG response of the MoS2/NW hybrid. The pattern of the anisotropic SHG depends highly on the stacking angle between the nanowire direction and the MoS2 crystal orientation, which is attributed to the 1D NW induced directional strain fields in the layered MoS2. A similar effect has also been observed in bilayer MoS2/NW hybrid structure, further proving the proposed scenario. This work provides an effective approach to selectively and directionally designing the nonlinear optical response of layered TMDCs, paving the way for developing high performance, anisotropic nonlinear photonic nanodevices.
author_names: Dawei Li

Chengyiran Wei

Jingfeng Song

Xi Huang

Fengfeng Wang

Kun Liu

Wei Xiong

Xia Hong

Bai Cui

Aixin Feng

Lan Jiang
title: Anisotropic Enhancement of Second Harmonic Generation in Monolayer and Bilayer MoS2 by Integrating with TiO2 Nanowires.
venue: Nano letters
year: 2019