INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Junying Huang,Mengting Chen,Xiaowen Zhang,Weipeng Liu,Yingju Liu
In order to optimize the conductivity of molybdenum disulfide (MoS 2 ) and promote its large-scale application as a catalyst for hydrogen evolution , MoS 2 is usually used to form composites with conductive materials , but these hybrid materials suffer from scare active sites, overlapping and complicate process. In this work, phosphoric acid is used as a builder of stereoscopic structures, which can not only twist graphene sheets into a P-doped three-dimensional (3D) graphene network but also promote surface electron transport between graphene sheets. Without adding additional framework materials such as carbon nanotubes or nickel foam, stereoscopic MoS 2 /graphene structures are formed with a large number of twisted graphene sheets to support the vertical growth of MoS 2 and expose the edge sites of MoS 2 , showing a low Tafel slope about 35 mV dec −1 , a high current density of 900 mA cm −2 at about 300 mV and a robust stability over 2000 cycles. Thus, this work shows a possibility to synthesize an efficient catalyst on a large-scale for hydrogen evolution reaction, which can promote the realization of hydrogen economy .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zheng Wang,Jiawei Wang,Fumin Wang,Xubin Zhang,Xinyuan He,Shuai Liu,Zhengliang Zhang,Zhiwei Zhang,XingTao Wang
Elemental-doped is considered as an effective strategy to modulate the electronic structure of Metallic MoS 2 (i.e., 1T-MoS 2 ) and enhance its electrochemical performance. Herein, DFT is applied to predict the electronic structure of different transition metals (TMs) doped 1T-MoS 2 . Based on the results, stable Ni-doped 1T-MoS 2 (N 3 MS) is synthesized in a propionic acid (PA) aided system. Electrochemical tests show that N 3 MS possesses an excellent specific capacitance of 2461.2 F·g −1 at 1 A·g −1 and a cycle retention rate of 85.67 % at 10 A·g −1 for 1000 cycles due to the critical contribution of Ni-doped to electronic structure modulation. Meanwhile, in-situ Raman measurements show that the active sites of N 3 MS are Mo 3+ and Ni 2+ . The assembled N 3 MS//ZnO/ZnS-C hybrid device shows a specific capacitance of 242.28 F·g −1 at 1 A·g −1 , an excellent energy density of 65.96 Wh·kg −1 at the power density of 700 W·kg −1 and the excellent stability for up to 2000 cycles (77.26 % retention at 5 A·g −1 ). This work proves the significant contribution of elemental doping to modulate electronic structures and improve electrochemical performance.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-16
·
IF 10.435
Zhao Jiayan,Wu Hang,Zhao Jiulong,Yin Yichen,Zhang Zhilun,Wang Shige,Lin Kun
Owing to the hypoxia status of the tumor, the reactive oxygen species (ROS) production during photodynamic therapy (PDT) of the tumor is less efficient. Herein, a facile method which involves the synthesis of Mg–Mn–Al layered double hydroxides (LDH) clay with MoS2 doping in the surface and anionic layer space of LDH was presented, to integrate the photo-thermal effect of MoS2 and imaging and catalytic functions of Mg–Mn–Al LDH. The designed LDH-MoS2 (LMM) clay composite was further surface-coated with bovine serum albumin (BSA) to maintain the colloidal stability of LMM in physiological environment. A photosensitizer, chlorin e6 (Ce6), was absorbed at the surface and anionic layer space of LMM@BSA. In the LMM formulation, the magnetic resonance imaging of Mg–Mn–Al LDH was enhanced thanks to the reduced and acid microenvironment of the tumor. Notably, the ROS production and PDT efficiency of Ce6 were significantly improved, because LMM@BSA could catalyze the decomposing of the overexpressed H2O2 in tumors to produce oxygen. The biocompatible LMM@BSA that played the synergism with tumor microenvironment is a promising candidate for the effective treatment of cancer.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Xiaozi Lin,Xi Wang,Qingwei Zhou,Chengyan Wen,Shaoqiang Su,Jie Xiang,Pengfei Cheng,Xianbiao Hu,Ye Li,Xin Wang,Xingsen Gao,Richard Nözel,Guofu Zhou,Zhang Zhang,Junming Liu
Photocatalysis is one of the most promising technologies in wastewater treatment. However, the inactivity to visible light and the inconvenience to recycle severely limit its practical application. In this work, via a facile hydrothermal method, Fe3O4 NPs were integrated onto the surfaces of 3D ball-flower-like MoS2 microspheres as efficiently visible light responsive and magnetically recyclable photocatalysts. Experimental results indicate that, an optimal loading amount (20 wt %) of Fe3O4 NPs can not only effectively enhance the photocatalytic ability of the MoS2/Fe3O4 (MF) hybrid composite with approximately 2 times better than pure MoS2, but also make it conveniently recycle from water by an external magnetic field. The photoelectrochemical studies also reveal that the incorporation of Fe3O4 NPs can effectively enhance the charge transfer rate and accelerate separation of photoinduced charge carriers. The surface catalytic mechanism of MF hybrid composite was also explored through XPS spectra. With both the excellent photocatalytic performance and magnetical recyclability, the 20 wt %-MF hybrid composite is considered to be a promising and competitive photocatalyst for wastewater treatment utilizing solar energy.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Miaomiao Xiang,Chenxi Huang,Yue Xing,Huihui Liu,Xiang Shao
Hybridization with oxide semiconductors provides a versatile strategy for tailoring physicochemical properties of two-dimensional materials (2DMs). However, the direct impacts of specific interface interactions have not yet been very well categorized, in particular at an atomic level. In the present work, through a chemical vapor deposition (CVD) method, we successfully grew monolayer MoS2 flakes on an atomically smooth rutile TiO2 single crystal with (100), (110), and (001) terminations. We found that the fabrication of comparable high-quality MoS2 on all of the TiO2 substrates can only be achieved via finely varying the growth parameters. Moreover, the photoluminescence of MoS2 also changes against the substrate terminations, showing a gradually reduced A0/A– exciton ratio following the sequence of (100) > (110) > (001). Detailed X-ray photoelectron spectroscopy measurements showed the same tendency for the binding energy shifts of both Ti and O in the MoS2/TiO2 samples, which were attributed to the varied dipole fields established at the MoS2/TiO2 interfaces. Our work not only reinforces the important role of interface charge redistribution in tailoring the properties of hybridized systems but also emphasizes that the facet effect may be applied as an efficient strategy for optimizing the photocatalytic activities of compositional systems.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 3
·784-794
·
IF 8.131
Shuhui Liu,Binghua Jing,Chunyang Nie,Zhimin Ao,Xiaoguang Duan,Bo Lai,Youyuan Shao,Shaobin Wang,Taicheng An
Natural mechanical energies, such as wind, tidal waves, and water flow, widely exist in the environment and these inexhaustible natural mechanical energies can be utilized through piezoelectric materials for the degradation of aqueous organic pollutants in the environment. In this work, few-layered molybdenum disulfide nanoflowers (MoS2 NFs) were adopted as a piezocatalyst to activate peroxymonosulfate (PMS) with ultrasonic waves (US) as the mechanical force for phenol abatement. A much higher degradation efficiency was attained by the integrated US/MoS2 NFs/PMS system compared to other single systems, revealing the markedly synergistic effect of US and MoS2 on PMS activation. Moreover, density functional theory calculations were performed to fundamentally understand the charge distribution in a polarized MoS2 nanosheet under different strains and to understand the piezocatalytic properties of MoS2 nanosheets, as well as reaction pathways between PMS and carriers on the active edges of MoS2 for the production of free radicals. It was found that both sulfate radicals (SO4˙−) and hydroxyl radicals (˙OH) were produced in the US/MoS2 NFs/PMS system. However, SO4˙− was quickly converted into ˙OH via a hydrolysis reaction under US, enabling ˙OH to be the primary reactive oxygen species for phenol oxidation. This work offers an efficient piezocatalyst to activate persulfate for water remediation. More importantly, it provides fundamental insights into the piezoelectricity in two-dimensional semiconducting materials and the mechanism in the piezocatalytic activation of persulfate. Results prove that the combination of piezoelectricity and advanced oxidation processes is promising for water pollution control, and provides a new idea for the application of inexhaustible natural mechanical energy in the environment for environmental remediation.
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CELLULOSE
·
2021
·Vol. 28
·期 10
·6513-6522
·
IF 5.044
Chen Siling,Li Jilong,Song Yiheng,Yang Quanling,Shi Zhuqun,Xiong Chuanxi
Flexible piezoelectric nanogenerators for energy harvesting are getting more and more attention nowadays by converting the mechanical energy to electric energy. Here, an environment-friendly piezoelectric nanogenerator based on the regenerated cellulose (RC)/MoS 2 nanosheet nanocomposite successfully exhibited a relative high output voltage of 2 V and current of 150 nA under slight press which were 5 and 7.5 times higher than those of the neat RC film, i.e. 0.4 V and 20 nA, respectively. In particular, the MoS 2 nanosheets were obtained through a simple, facile and low-cost pathway by mechanical exfoliation in triethanolamine. The nanocomposite film with MoS 2 nanosheets content of 4% exhibited a high piezoelectric constant ( d 33 ) of 19 pC/N, which was 6.3 times higher than that of the neat RC film ( i.e. 3 pC/N). Thus, the RC/MoS 2 piezoelectric nanogenerator has great potential applications in the fields of energy harvester, sensors and is of great significance to environment protection.
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RARE METALS
·
2022
·Vol. 41
·期 5
·1743-1752
·
IF 6.318
Zuo Jing-Han,Zhai Peng-Bo,He Qian-Qian,Wang Lei,Chen Qian,Gu Xiao-Kang,Yang Zhi-Lin,Gong Yong-Ji
Lithium–sulfur batteries are recognized as one of the most promising next-generation high-performance energy storage systems. However, obstacles like the irreversible capacity loss hinder its broad application. Herein, we fabricated an interconnected three-dimensional MoS 2 –MoN heterostructure (3D-MoS 2 –MoN) via a facile salt-template method, overcoming the intrinsic shortcomings such as poor conductivity and compact morphology of traditionally-synthesized transition metal sulfides (TMSs). Furthermore, excellent electrocatalysis ability and hierarchical pore structure effectively accelerate the sluggish lithium polysulfides conversions during cycling. As a result, 3D-MoS 2 –MoN showed a high initial specific capacity of 1466 mAh·g −1 and excellent high-rate capability up to 4 °C. A stable cycling performance with a sulfur loading of 2 mg·cm −2 was realized with a low decay rate of 0.069% per cycle. This work introduced a rational design route for the appliance of TMSs in the lithium-sulfur batteries. Graphic abstract
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RSC Advances
·
2020
·Vol. 10
·期 63
·38715-38726
·
IF 3.119
Xiaona Zhao,Yuanchao Lei,Gang Liu,Libing Qian,Xiaowei Zhang,Yunjie Ping,Hongjing Li,Qing Han,Pengfei Fang,Chunqing He
A piezoelectric catalyst of the MoS2@TNr composite (MoS2 nanosheets composited with TiO2 nanorods) was synthesized by a two-step hydrothermal method, and can be recycled and reused as an advanced anode material for supercapacitors. In the dark, the MoS2@TNr composite exhibited ultra-fast piezoelectric catalytic performance and good cycle stability on dye degradation; within 10 min, nearly all rhodamine B (50 mL, 20 ppm) was removed from the solution with the assistance of magnetic stirring. After the 5 cycle degradation reaction, the catalyst was reclaimed and applied to electrochemical testing, which showed better supercapacitor capacitance properties than the fresh catalyst due to the introduction of oxygen vacancies generated from the piezoelectric degradation process. The reclaimed catalyst demonstrated an excellent specific capacitance of 249 F g−1 at 1 A g−1, and 92% capacitance retention after 10 000 cycles. Furthermore, as the current density increased to 30 A g−1, the capacitance could maintain 58% of the initial value. Thus, it can be concluded that the abandoned catalysts may serve as a potential electrode material for energy storage; simultaneously, the reutilization could eliminate secondary pollution and decrease the energy consumption in efficiency.
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CARBON
·
2021
·
IF 9.594
Xiao Zhang,Ping Yang,San Ping Jiang
The effect of transition metal particle size and distribution on the catalytic performances of carbon nanotubes (CNTs)-based catalysts has been attracting considerable attention in recent years. In this paper, Ni nanoparticles with a Ni 3 C shell structure were embedded in N-doped CNTs by thermal condensation of dicyandiamide with Ni salts followed by MoS 2 nanosheets deposition. Most interesting, dissolution, redistribution and diffusion of the embedded Ni/Ni 3 C nanoparticles take place during the stage of deposition of MoS 2 nanosheets on the CNTs with the help of excess S precursors. The dissolution, redistribution and diffusion result in the disappearance of Ni nanoparticles and formation of much finer Ni nanoclusters , which significantly facilitates the deposition and formation of vertical MoS 2 nanosheets on CNTs. The homogeneous distribution of Ni nanocluster leads to improved intrinsic conductivity and increased active sites. N-doped CNTs with optimized Ni and MoS 2 loading revealed high activity and stability for electrocatalytic hydrogen evolution reaction (HER). The as-prepared MoNiCNTs electrocatalysts exhibit superior HER activity with low onset potential and small Tafel slope value in both acidic and alkaline electrolyte conditions. The result provides a new platform for rational design and fabrication of high-performance non-precious transition metal based HER electrocatalysts.
研究领域:
材料科学
·
催化化学
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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Lin Hu,Xiu-Feng Song,Sheng-Li Zhang,Hai-Bo Zeng,Xue-Ji Zhang,Robert Marks,Dan Shan
The electrocatalytic hydrogen evolution reaction (HER) is one of the core components of energy conversions. The chemical-physical properties and morphological structures of electrocatalysts are the main factors that determine the HER performance. Thus, the rational design of efficient electrocatalysts is essentially required. A new heteronanostructured system is proposed, which comprises MoS 2 nanoparticles (MoS 2 NPs) coupled to SnS 2 ultrathin nanosheets (SnS 2 NS) and operates as an efficient HER electrocatalyst. Advanced spectroscopic techniques are applied to confirm formation of heteronanostructure and occurred electron modulation of MoS 2 NPs/SnS 2 NS. Surprisingly, the MoS 2 NPs/SnS 2 NS electrocatalyst is highly efficient for HER with a low overpotential (∼0.249 V at the current density of 10 mA cm −2 ), small Tafel slope (∼42.1 mV decade −1 ) and excellent electrocatalytical stability.
研究领域:
材料科学
·
电化学
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POWDER TECHNOLOGY
·
2015
·
IF 2.349
Ping Liu,Yongwei Zhu,Shangwen Zhang
When hydrophobic particles are employed to prepare self-lubricating electroless composite coatings , they usually require surface modification to improve their wettability . The study focuses on the resultant change in wettability of the MoS 2 particles with an inorganic coating . Al 2 O 3 -coated MoS 2 particles were prepared by using a heterogeneous nucleation process. Then, particle surface morphology and structure were examined by using SEM, EDS and XRD . Contact angle measurements were conducted by using a thin layer wicking technique and a sessile drop method in order to determine the surface free energy components of the bare and the coated MoS 2 particles. Our results showed the MoS 2 particles were successfully coated with an Al 2 O 3 layer, which is an amorphous structure. The decreased water contact angle indicates an enhanced hydrophilicity for the coated particles. This decrease depends more strongly on a significant decrease of a new parameter ratio, γ + /γ − , than on a slight increase in total surface free energy. The surface energy component of the bare MoS 2 is very consistent with that of Talc, and that of the Al 2 O 3 -coated one is very similar to that of alumina , apart from the base component.
研究领域:
材料科学
·
表面化学
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危险品化学品经营许可证（带存储）