Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 13
·7897-7906
·
IF 10.733
Jingyi Wu,Xiongwei Li,Hongxia Zeng,Yang Xue,Fangyan Chen,Zhigang Xue,Yunsheng Ye,Xiaolin Xie
The polysulfide shuttle effect and sluggish reaction kinetics can severely reduce the sulfur utilization and cycle stability of Li–S batteries, undermining their use in practical applications. Herein, we design a core–shell nanocomposite by encapsulating radially oriented MoS2 nanosheets by porous nitrogen-doped carbon (MoS2@NC) via an eco-friendly method. The highly oriented MoS2 nanosheets in MoS2@NC avoid aggregation of the active sites for polysulfide adsorption, and the desirable integration of the catalytic MoS2 nanosheet core and a highly conductive carbon shell provides a constant flow of electrons to the captured polysulfides for improved polysulfide conversion kinetics. The combined benefits of high polysulfide inhibition and smooth electron and Li+ transfer by a thin layer of MoS2@NC (3.3 μm thick) enable a simple sulfur–carbon black cathode with high reversible capacities, good rate performances (876 mA h g−1 at 3C), an excellent cycle stability over 1500 cycles with a negligible 0.034% decay per cycle, and satisfactory areal capacities with increased sulfur loading (2.0–3.7 mA h cm−2 at various rates). This work provides a proof-of-concept study on the rational design of interlayer materials in energy storage systems.
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高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Xin Zhao,Hao Guo,Rui Xue,Mingyue Wang,Qixia Guan,Tian Fan,Wenhu Yang,Wu Yang
Alteration in the concentrations of guanine (G) and adenine (A) leads to various abnormalities in the metabolic process which causes various diseases. Therefore, it still remains a challenge to establish an accurate, simple and accurate method for simultaneous detection of guanine and adenine. In this paper, using covalent organic frameworks (COFs) as a carrier and the amino functionalized reduced graphene oxide as charge transfer accelerator, layer molybdenum disulfide (MoS 2 ) nanosheets are deposited on glassy carbon electrode (GCE) by simple physical stacking to fabricate a dual-signal amplification biosensor for simultaneous detection of adenine and guanine. Under optimized conditions, the electrochemical behaviors of guanine and adenine on the COFS/NH 2 -rG/MoS 2 modified electrode were studied by cyclic voltammetry and differential pulse voltammetry. The sensor performs well in determining G and A at the same time with wide linear ranges of 0.5–150.0 μM and 1.0–280 μM and low detection limits of 0.51 μM(S/N = 3) and 0.44 μM(S/N = 3), respectively. The sensor was successfully used to assay G and A in thermally denatured herring sperm DNA, and the G/A ratio was calculated to be 0.79. The biosensor has the advantages of simplicity, speed, high sensitivity, good reproducibility, and long-term stability.
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CHEMOSPHERE
·
2020
·
IF 5.778
Ahmad Beyhaqi,Qingyi Zeng,Sheng Chang,Mingqi Wang,Seyed Mohammad Taghi Azimi,Chun Hu
Graphitic carbon nitride (g-C 3 N 4 ) has enormous potentials for photocatalysis , yet it only possesses moderate activity because of excitonic effects and sluggish charge transfer. Here, we develop a novel two-dimensional g-C 3 N 4 /WO 3 /MoS 2 (CWM) ternary nanocomposite through a facile co-calcination and a hydrothermal process to reach a highly-efficient photocatalyst for organic pollutant elimination under visible light. The WO 3 and MoS 2 nanoparticles were dispersed on the ultra-thin g-C 3 N 4 nanosheets, in which the electronegative g-C 3 N 4 facilitates formation of oxygen vacancies in WO 3 . Compared to pure g-C 3 N 4 , WO 3 , and binary composites, CWM exhibited higher photocatalytic activities for various organic pollutants removal under visible light irradiation. For instance, the CWM showed a removal ratio of ∼99% for RhB after only 10 min irradiation of visible light (λ > 420 nm) and nearly 100% for ciprofloxacin after 2 h of operation. The results showed that OH radicals are the main active species for organic degradation , which suggests a direct Z-scheme heterojunction in CWM that improved spatial separation of charge carries. Furthermore, the collection of electrons is significantly enhanced by MoS 2 for oxygen reduction reaction, and the increased oxygen vacancies of WO 3 further enhanced the separation of electron-hole pairs; therefore, it led to an effective suppression of charge carriers recombination. The above synergistic effects of ternary photocatalyst result in higher photocatalytic oxidation performance for wastewater treatment compared with pure WO 3 , g-C 3 N 4 and their binary composites.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jian Liu,Ying-Ge Xu,Ling-Bin Kong
Metal sulfide is the most promising anode material for sodium storage devices due to its high theoretical capacity and low cost. However, the practical application of metal sulfide is largely hindered by huge capacity fading during the sodiation/desodiation process. Here mixed bimetallic sulfides grown on reduced graphene oxide (MoS 2 /CoS 2 -RGO) are prepared via a facile hydrothermal method. MoS 2 /CoS 2 -RGO displays a unique 2D structure which provides large specific surface area for pseudocapacitive charge storage, polyvalent ion reaction for ultrahigh capacity, and a heterostructure to high Na-ion diffusion rate. The optimized MoS 2 /CoS 2 -RGO shows a considerable reversible capacity of 593.6 mA h g −1 at 100 mA g −1 over 50 cycles and a high rate capability of 215.8 mA h g −1 even at a high specific current of 5000 mA g −1 . A reaction kinetics and galvanostatic intermittent titration technique analysis indicates that MoS 2 /CoS 2 -RGO possesses fast pseudocapacitive charge storage and high Na-ion diffusion rate, benefiting the kinetics balance between anode and cathode. With this special structure, SICs containing the anode deliver a high specific energy of 152.98 W h kg −1 at 562.5 W kg −1 . Similarly, the SIB exhibits a good capacities of 64 mA h g −1 at the high rates of 5C over 100 cycles.
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Nano Research
·
2021
·Vol. 14
·期 10
·3523-3530
·
IF 8.897
Ma Guangyao,Zhou Yanli,Wang Yingying,Feng Zhenyu,Yang Jian
Layer-structured MoS 2 is regarded as a promising anode material for potassium ion batteries. Herein, MoS 2 nanosheets on N, P-codoping reduced graphene oxide (MoS 2 /N, P-rGO) have been successfully prepared via a facile two-step synthesis, where few-layered MoS 2 nanosheets are chemically bonded onto the surface of N, P-rGO. As an anode material, MoS 2 /N, P-rGO exhibits a high specific capacity (462.7 mAh·g −1 at 100 mA·g −1 over 200 cycles), outstanding rate capability (224.9 mAh·g −1 at 20 A·g −1 ), and excellent cycle life (236.6 mAh·g −1 at 2 A·g −1 after 7,000 cycles), much better than those of MoS 2 and MoS 2 /rGO. These advanced performances outperform most of the reported anode materials for potassium ion batteries to date. Meanwhile, the K-storage reactions of MoS 2 /N, P-rGO have been disclosed through in-situ and ex-situ characterizations. The kinetics analysis confirms that K-storage of MoS 2 /N, P-rGO is predominant by pseudo-capacitance.
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高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Bingling Hu,Xiaoyun Qin,Abdullah M. Asiri,Khalid A. Alamry,Abdulrahman O. Al-Youbi,Xuping Sun
The present communication reports on the first preparation of porous tubular C/MoS 2 nanocomposites using porous anodic aluminum oxide as a template. We further demonstrate the application of such composites as a novel electrode material for supercapacitors . It is found that they can deliver a high capacitance of 210 F/g at 1 A/g and exhibit excellent long-term cycling stability over 1000 cycles.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yiwen Wang,Qinliang Jiang,Hua Fan,Lihe Wang,Jihai Xiong,Jianquan Luo
A novel thin-film nanofiltration (NF) membrane was prepared successfully by interfacial polymerization of piperazine and trimesoyl chloride on a porous molybdenum disulfide oxide (O-MoS 2 ) modified polysulfone (PSf) substrate with greatly enhanced separation performance. In this work, scanning electron microscopy confirmed that the optimized PSf substrate formed elongated finger-like pores during the phase inversion process, significantly different from other membranes and key to improving the water transport and desalination of the membrane. The effects of different dye molecular structures, varieties, and charges, and the feed solution and salt concentrations in the blend solution on salt and dye rejection and water flux of NF membranes were explored. Compared with the control membrane, the optimized membrane’s rejection performance and water permeability were greatly improved when treating simulated dye wastewater. After the introduction of O-MoS 2 (0.06 wt.%), the introduction of O-MoS 2 increased the chromotropic acid 2B and Rose Bengal rejection rates of the membrane compared to the original, from the original of 97.73%, 99.79% to 99.41% and 99.99%, respectively, and the water flux enhanced from the beginning of 32.8, 32.0–43.2 and 43.7 L/m 2 ·h, respectively. Furthermore, in a 120 h simulated dye wastewater treatment stability test, the optimized F6 membrane showed stronger flux stability and excellent rejection performance, providing its vast potential for application in dye wastewater treatment.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1725
·
IF 4.324
Zhi Zeng,Dongbo Wang,Jinzhong Wang,Shujie Jiao,Yuewu Huang,Sixiang Zhao,Bingke Zhang,Mengyu Ma,Shiyong Gao,Xingguo Feng,Liancheng Zhao
In this work, MoS2microspheres/PtCo-alloy nanoparticles (MoS2/PtCo-alloy NPs) were composited via a novel and facile process which MoS2is functionalized by poly (N-vinyl-2-pyrrolidone) (PVP) and self-assembled with PtCo-alloy NPs. This new composite shows excellent electrocatalytic activity and great potential for dye-sensitized solar cells (DSSCs) as a counter electrode (CE) material. Benefiting from heterostructure and synergistic effects, the MoS2/PtCo-alloy NPs exhibit high electrocatalytic activity, low charge-transfer resistance and stability in the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) test. Meanwhile, a high power-conversion efficiency (PCE) of 8.46% is achieved in DSSCs with MoS2/PtCo-alloy NP CEs, which are comparable to traditional Pt CEs (8.45%). This novel composite provides a new high-performance, stable and cheap choice for CEs in DSSCs.Keywords:MoS2/PtCo-alloy nanoparticles;dye-sensitized solar cells;counter electrodes;efficiency;electrocatalytic activity
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yan Zhuang,Shuang Meng,Xue Yang,Dongxuan Guo,Dantong Zhang,Tai Peng,Yue Li,Jinlong Li
The formation of amorphous-crystalline heterojunctions has been recognized as an exceptionally effective strategy for enhancing the separation and transfer of photogenerated charge carriers, thereby improving photocatalytic efficiency. In this study, amorphous-crystalline MoS 2 /g-C 3 N 4 /Co 3 O 4 ternary heterojunctions with a unique flower-like structure were synthesized via the integration of g-C 3 N 4 nanosheets and amorphous MoS 2 onto Co 3 O 4 microspheres with a floral structure using a simple solvothermal method followed by acid treatment. Density functional theory (DFT) calculations revealed that the unique floral morphology, combined with the formation of amorphous-crystalline heterojunctions, facilitates the efficient transfer of photogenerated carriers while simultaneously suppressing the recombination of electron-hole pairs. The optimized MoS 2 /g-C 3 N 4 /Co 3 O 4 (3 %) heterojunction exhibited remarkable photocatalytic performance, achieving 82.1 % degradation of Rhodamine B (5 mg L −1 ) under visible-light irradiation within 90 min. Furthermore, the photocatalyst exhibited excellent stability and reusability, as confirmed through cycling experiments, and efficiently decomposed Rhodamine B and its intermediates into small, non-toxic molecules. This work highlights the successful development of a highly active, recyclable amorphous-crystalline ternary heterojunction with a flower-like structure, providing a novel and efficient strategy for the visible-light-driven removal of organic pollutants.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yongde Ma,Rengan Liang,Wenquan Wu,Jiayin Zhang,Yanning Cao,Kuan Huang,Lilong Jiang
Developing catalysts with not only hydrogenation activity but also cracking activity is very important for the advancement of suspended-bed hydrocracking technology. Within this respect, MoS 2 /SiO 2 -Al 2 O 3 bifunctional catalyst is a kind of typical catalysts with both hydrogenation and cracking activity. Herein, a series of Zr-doped SiO 2 -Al 2 O 3 mixed oxides were synthesized by a sol-gel coupled with hydrothermal method. The synthesized mixed oxides were characterized for chemical structures and acidic properties. It is found that doping SiO 2 -Al 2 O 3 with Zr atoms significantly increases the numbers of acidic sites. The Zr-doped SiO 2 -Al 2 O 3 mixed oxides were then combined with dispersed MoS 2 , which was in-situ produced from oil-soluble Mo precursors, to fabricate a novel kind of bifunctional catalysts for suspended-bed hydrocracking of heavy oils. Owing to the significantly increased numbers of acidic sites in Zr-doped SiO 2 -Al 2 O 3 mixed oxides, corresponding bifunctional catalysts demonstrate much enhanced activity for suspended-bed hydrocracking of heavy oils in relative to MoS 2 /SiO 2 -Al 2 O 3 bifunctional catalysts.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhihu Pan,Xiaohong Ji
The developments in hydrogen evolution reaction (HER) and supercapacitor technologies for electrochemical energy storage and conversion have received considerable attention. Although MoS 2 is electrochemically active for both HER and supercapacitors, limited active sites, slow ionic transport, and poor conductivity lead to its poor capacitance and electrocatalytic activity . Herein, hierarchical Ti 3 C 2 T x /MoS 2 /Ti 3 C 2 T x @CC (TMT@CC) composites were well-designed as electrodes for both HER and supercapacitors. Flexible TMT@CC electrodes with an area as large as ∼ 80 cm 2 and optimal mass-loading of 17.9 mg cm −2 were achieved. The inner layer Ti 3 C 2 T x in the composites provides ideal nucleation sites for the growth of MoS 2 arrays, and the outermost Ti 3 C 2 T x effectively anchors the vertically arrayed MoS 2 . The hierarchically vertical structure provides strong interfacial coupling and shortens ion diffusion paths, leading to high stability and fast ion/electron transport kinetics. Due to such a synergistic effect, the flexible binder-free TMT@CC electrodes exhibited high areal capacitance (5.06 F cm −2 at 5 mA cm −2 ) for supercapacitors and low overpotential (119 mV versus RHE at 10 mA cm −2 ) for HER catalyst. Furthermore, a high energy density of 0.125 mWh cm −2 at a power density of 1.5 mW cm −2 has been achieved from the TMT@CC-based symmetric supercapacitor . Our strategy can be expanded to other vertically arrayed hierarchical structures as electrode materials of efficient HER and supercapacitors.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 15
·6289-6298
·
IF 9.931
Boya Sun,Qinglei Liu,Wenshu Chen,Ning Wang,Jiajun Gu,Wang Zhang,Huilan Su,Di Zhang
Molybdenum disulfide (MoS2) holds great promise as an advanced anode material for lithium ion batteries, but suffers from poor electrochemical performance, especially cycling stability. Here, we report micron-sized particulates composed of encapsulated-type MoS2/C hybrid nanostructures which provide an effective confinement effect to soluble intermediate products during cycling reactions, offering a physically robust framework and locally stable sites for MoS2-based electrode reactions during the cycling process. The micron-sized MoS2/C exhibits a high specific capacity of 1343 mA h g−1 on average at 0.1 A g−1, excellent rate performance (929 mA h g−1 at 1 A g−1), and remarkable cycling stability with 1250 mA h g−1 retention at 1 A g−1 after 480 cycles. In addition, we further clarify the uniform redistribution of S and Mo in the carbon matrix during the decomposition of MoS2 nanoparticles which demonstrates the confinement effect of hybrid structures thus leading to an enhanced electrochemical performance, providing a meaningful suggestion for the rational design of sulfide- and selenide-based carbon hybrid electrodes for practical applications.
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高影响因子
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