查找使用阿拉丁产品的科研文献

N, P Codoped Hollow Carbon Nanospheres Decorated with MoSe2 Ultrathin Nanosheets for Efficient Potassium-Ion Storage

Lifeng Cui,Zhide Wang,Shifei Kang,Yanyan Fang,Ya Chen,Weikang Gao,Zhiyuan Zhang,Xin Gao,Chunyu Song,Xiaodong Chen,Yangang Wang,Guoxiu Wang

Potassium-ion batteries (KIBs) are gradually being considered as an alternative for lithium-ion batteries because of their non-negligible advantages such as abundance and low expenditure of K, as well as higher electrochemical potential than another alternative─sodium-ion batteries. Nevertheless, when the electrode materials are inserted and extracted with large-sized K+ ions, the tremendous volume change will cause the collapse of the microstructures of electrodes and make the charging/discharging process irreversible, thus disapproving their extended application. In response to this, we put forward a feasible strategy to realize the in situ assembly of layered MoSe2 nanosheets onto N, P codoped hollow carbon nanospheres (MoSe2/NP-HCNSs) through thermal annealing and heteroatom doping strategies, and the resulting nanoengineered material can function well as an anode for KIBs. This cleverly designed nanostructure of MoSe2/NP-HCNS can broaden the interlayer spacing of MoSe2 to boost the efficiency of the insertion/extraction of K ions and also can accommodate large volume change-caused mechanical strain, facilitate electrolyte penetration, and prevent the aggregation of MoSe2 nanosheets. This synthetic method generates abundant defects to increase the amounts of active sites, as well as conductivity. The hierarchical nanostructure can effectively increase the proportion of pseudo-capacitance and promote interfacial electronic transfer and K+ diffusion, thus imparting great electrochemical performance. The MoSe2/NP-HCNS anode exhibits a high reversible capacity of 239.9 mA h g–1 at 0.1 A g–1 after 200 cycles and an ultralong cycling life of 161.1 mA h g–1 at 1 A g–1 for a long period of 1000 cycles. This nanoengineering method opens up new insights into the development of promising anode materials for KIBs.

Piezoelectric 1T Phase MoSe2 Nanoflowers and Crystallographically Textured Electrodes for Enhanced Low-Temperature Zinc-Ion Storage

Yihui Li,Xingfang Dong,Zewen Xu,Menglei Wang,Ruofei Wang,Juan Xie,Yangjian Ding,Pengcheng Su,Chengying Jiang,Xingmin Zhang,Liyu Wei,Jing-Feng Li,Zhaoqiang Chu,Jingyu Sun,Cheng Huang

Transition metal dichalcogenides (TMDs) are regarded as promising cathode materials for zinc-ion storage owing to their large interlayer spacings. However, their capabilities are still limited by sluggish kinetics and inferior conductivities. In this study, a facile one-pot solvothermal method is exploited to vertically plant piezoelectric 1T MoSe 2 nanoflowers on carbon cloth (CC) to fabricate crystallographically textured electrodes. The self-built-in electric field owing to the intrinsic piezoelectricity during the intercalation/deintercalation processes can serve as an additional piezo-electrochemical coupling accelerator to enhance the migration of Zn 2+ . Moreover, the expanded interlayer distance (9–10 Å), overall high hydrophilicity, and conductivity of the 1T phase MoSe 2 also promoted the kinetics. These advantages endow the tailored 1T MoSe 2 /CC nanopiezocomposite with feasible Zn 2+ diffusion and desirable electrochemical performances at room and low temperatures. Moreover, 1T MoSe 2 /CC-based quasi-solid-state zinc-ion batteries are constructed to evaluate the potential of the proposed material in low-temperature flexible energy storage devices. This work expounds the positive effect of intrinsic piezoelectricity of TMDs on Zn 2+ migration and further explores the availabilities of TMDs in low-temperature wearable energy-storage devices.

Facile synthesis of MoSe2/carbon nanotubes (CNTs) composite with improved electrochemical performance for lithium/sodium storage

Zhang Canping,Zhang Jiahao,Fu Yajing,Liu Jianwen,Wang Shiquan,Wang Yingxi

MoSe 2 /carbon nanotubes (CNTs) composite was synthesized by a hydrothermal method and followed by annealing in Ar gas using Na 2 MoO 4 ·2H 2 O, CN 2 H 4 Se, and NH 2 OH·HCl as reactants in the presence of CNTs. The products were characterized by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The results show that the introduction of CNTs plays a crucial role in the morphology and electrochemical performance as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The MoSe 2 /CNT electrode exhibits a high reversible capacity of 1140 mAh g −1 and 1014 mAh g −1 at the current density of 100 mA g −1 for LIBs and SIBs, respectively. The MoSe 2 /CNT electrode exhibits higher capacity, better cycling stability compared with the bare MoSe 2 . The MoSe 2 and MoSe 2 /CNT composite behave good electrochemical properties may be due to their flower-like nanosheets, well-stacked layers, and 3D CNTs networks. The results suggest that the MoSe 2 /CNT composite could be a promising anode material for LIB and SIB applications. Moreover, our present work provides a new approach for the fabrication of well-crystalline MoSe 2 material and further applications in lithium/sodium storage.

Construction of novel ternary MoSe2/ZnO/p-BN photocatalyst for efficient ofloxacin degradation under visible light

Huayi Cai,Jingjing Wang,Zhao Du,Zhiyuan Zhao,Yaxin Gu,Zhonglu Guo,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang

Photocatalysis has attracted much attention in the field of environmental remediation. However, the photocatalytic performance largely depends on efficient charge migration and solar light utilization. Herein, the ternary MoSe 2 /ZnO/p-BN (MZB) photocatalyst was successfully designed and synthesized. The degradation rate of the optimal sample 30 wt% MZB for ofloxacin (OFL) under visible light irradiation can reach 99.2%, and the photocatalytic reaction rate is 5.33 times and 2.10 times higher than that of pure ZnO and ZnO/p-BN. In the MoSe 2 /ZnO/p-BN system, p-BN can achieve the enrichment of pollutant to accelerate the catalytic rate, while the hybridization of MoSe 2 expands the spectral response of the catalysts. In addition, the formation of stepped electron transport routes reduces the electron-hole pair recombination rate. The active species quenching experiments reveal that e - , •O 2 − , h + and •OH play a major role in the removal of antibiotic contaminants. The analysis of OFL degradation intermediates reveals the possible degradation pathways and proposes a reasonable photocatalyst mechanism. Therefore, this work provides new ideas for designing high-performance visible light responsive photocatalysts for pollution treatment.

Single Ru atoms dispersed on MoSe2/MXene nanosheets with multiple interfaces for enhanced acidic hydrogen evolution

Tiantian Ma,Peng Wang,Hua-Jie Niu,Zhongxuan Che,Guozheng Li,Wei Zhou

Exposing more catalytic active sites is an effective strategy to enhance the catalyst activity for hydrogen evolution reaction (HER). Herein, Ti 3 C 2 T x MXene served as a substrate to load thin and curved 2 H –MoSe 2 nanosheets by a typical hydrothermal method , forming MoSe 2 /MXene heterointerface with the fully exposed Mo edge sites. And then, atomically dispersed Ru single atoms (RuSAs) were successfully anchored on the MoSe 2 /MXene (RuSAs@MoSe 2 -MXene). The X-ray absorption near edge structure (XANES) demonstrates that Ru is loaded as single atoms on MoSe 2 and MXene . The prepared sample exhibits improved catalytic activity with a small overpotential of 49 mV at 10 mA cm −2 and a low Tafel slope of 52 mV dec −1 for HER in 0.5 M H 2 SO 4 . It also exhibits excellent stability with a small attenuation voltage of 10 mV for 120 h at 10 mA cm −2 in 0.5 M H 2 SO 4 . When assembled into a two-electrode system of RuSAs@MoSe 2 -MXene||RuO 2 , it only requires a relatively low potential of 1.626 V at 10 mA cm −2 to drive overall water splitting (OWS). Control experiments disclose the highly improved performance can be primarily attributed to the introduced RuSAs and MoSe 2 /MXene heterointerfaces exposing more active sites of Ru and Mo. Moreover, the high conductivity of MXene can increase charge transfer in HER process. The interface engineering with multiple interfaces can provide fresh impetus for the development of efficient HER catalysts.

Regulating the Polysulfide Behavior by a Large-Scale Two-Dimensional Superlattice Interface in Li–S Chemistry

Chenzhi Ding,Yao Ding,Kao Wang,Zhaobo Zheng,Fang Liu,Xuyun Guo,Mohsen Tamtaji,Zhengtang Luo

Heterojunction engineering, serving as a key framework for building blocks between diverse functional materials, has emerged as a highly promising strategy to address the demand for efficient catalysts in lithium–sulfur (Li–S) batteries. However, achieving full matrix electronic control in the bulk phase is a bottleneck in regulating the electrochemical catalytic behavior of heterostructure catalysts. Herein, we report a “tube-in-tube” multifunctional catalyst that can strengthen the sulfur redox reaction (SRR) in Li–S batteries. Benefiting from a large-scale and oriented two-dimensional (2D) superlattice interface, the tailored heterostructure catalysts (MoSe2/MoS2@CNTs) show a “1 + 1 > 2” synergistic effect in lithium polysulfide (LiPSs) adsorption and catalytic conversion during SRR. In situ studies and theoretical results reveal that this 2D Moiré superlattice interface not only optimizes the adsorption of polysulfides but also moderates the overall electronic density of catalysts. Consequently, Li–S batteries assembled with MoSe2/MoS2@CNTs-PP as a modified separator deliver an outstanding discharge capacity of 1225 mAh g–1 at 0.2 C with a Ketjenblack/S cathode while maintaining a specific capacity of 870 mAh g–1 even at 5 C. Additionally, due to the inhibited “shuttle effect” by heterostructure catalysts, the modified separators exhibit a less capacity fading of 0.063% per cycle after 1000 cycles (1 C) even with a high sulfur loading (3.8 mg cm–2). This work focuses on designing an adsorption–catalysis synergistic interface within a full matrix of catalysts for Li–S chemistry and providing insights into the design of multifunctional catalysts for energy-storage systems based on the catalytic reaction, e.g., Zn–I2 and metal–air batteries, etc.

Gas Modulation Induced Ultra-Low Friction and Ultra-Strong Wear Resistance in Atomically Thin MoSe2 Single Crystals

Haoyu Deng,Tongtong Yu,Xinjian He,Shuang Li,Changhe Du,Pengfei Liu,Ruilin Shen,Yange Feng,Liqiang Zhang,Daoai Wang

Atomically thin films exhibiting ultra-low friction and ultra-strong wear resistance are crucial for overcoming lubrication challenges in micro-nano electromechanical systems (M/NEMS). However, achieving these properties under conventional pressure conditions remains a major challenge. In this study, a novel strategy is presented to further reduce friction and enhance wear resistance by tuning the atmosphere composition. High-quality monolayer (ML, ≈0.9 nm) and bilayer (BL) MoSe 2 single crystals are successfully synthesized via the chemical vapor deposition (CVD) method. Compared to BL MoSe 2 , ML MoSe 2 exhibits ultra-low coefficient of friction (COF = 0.0091) and super wear resistance (40 000 cycles@2.17 GPa) under atmospheric conditions. Additionally, the surface friction can be modulated by varying the oxygen-to-nitrogen ratio, and the best friction reduction and anti-wear properties are achieved in pure nitrogen. Notably, the COF of ML MoSe 2 can be further reduced by 50% (COF = 0.004), and the wear resistance increases nearly four times (208,640 cycles@2.26 GPa) in pure N 2 . Experimental and molecular dynamics analyses reveal that stronger adhesion of N 2 molecules to the surface, coupled with weaker intermolecular interactions, promotes ultra-low friction and super wear-resistance in ML MoSe 2 . The molecular mechanism proposed by this work provides a new degree of freedom for friction modulation and also introduces a promising strategy in constructing ultra-low friction and super wear-resistant systems with atomic-scale thickness.

Dual-carbon-constrained sulfur-doped MoSe2 composite as high-performance self-supporting anodes for sodium-ion batteries

Liu Zhen,Gao Zhiyang,Li Hui,Qi Xiaozhong,Xu Handi,Dou Bo,Qi Meili,Hu Ming,Pan Jiaqi

Developing anode materials that simultaneously delivered high capacity, excellent rate capability, and long-term cycling stability remained a formidable challenge for sodium-ion batteries. In this work, a self-supporting composite anode (dual-carbon confinement architecture) was synthesized via a one-step glucose-assisted hydrothermal method. The dual-carbon-confinement architecture and partial substitution of selenium by sulfur effectively expanded the interlayer spacing and induced interfacial defects, created abundant active sites to facilitated reversible Na + intercalation/deintercalation. Benefiting from the synergistic effect of sulfur doping and the interconnected carbon network, the electrode delivered a reversible capacity of 500 mAh g −1 at 0.1 A g −1 and maintained 300 mAh g −1 after 600 cycles at 0.3 A g −1 , exhibiting excellent structural stability and electrochemical durability. This study offered a promising strategy for the rational design and scalable synthesis of high-performance composite anode materials for next-generation sodium-ion storage systems. Section Graphical

One-pot synthesis of uniform MoSe2 nanoparticles as high performance anode materials for lithium/sodium ion batteries

Na Li,Qihua Zhou,Jing Lin,Yanzhen Lu,Zhiguo Hou,Yitai Qian

Molybdenum diselenide (MoSe 2 ) have attracted much attention as an anode material for lithium/sodium ion batteries due to its specific layered structure. Here, highly-uniform MoSe 2 nanoparticles are successfully synthesized via a one-pot hydrothermal method with addition of polyvinyl pyrrolidone (PVP) following by calcination treatment. PVP serves as a surfactant preventing the over-agglomeration of MoSe 2 nanosheets and contributing to the well-organized accumulation of MoSe 2 nanosheets into nanoparticles . When evaluated as anode for lithium ion batteries , the MoSe 2 nanoparticles show enhanced cycle stability and rate performance comparing to the MoSe 2 bulk prepared without addition of PVP. After 200 cycles, the MoSe 2 nanoparticles remain a specific capacity of 573.9 mAh g −1 at a rate of 200 mA g −1 . Meanwhile, MoSe 2 nanoparticles also display good sodium storage performance. Under the current density of 500 mA g −1 , MoSe 2 nanoparticles exhibit reversible capacity of 374.9 mA h g −1 after 100 cycles.

Sulfiphilic Few-Layered MoSe2 Nanoflakes Decorated rGO as a Highly Efficient Sulfur Host for Lithium-Sulfur Batteries

Wenzhi Tian,Baojuan Xi,Zhenyu Feng,Haibo Li,Jinkui Feng,Shenglin Xiong

Lithium-sulfur batteries (LSBs) have been regarded as a competitive candidate for next-generation electrochemical energy-storage technologies due to their merits in energy density. The sluggish redox kinetics of the electrochemistry and the high solubility of polysulfides during cycling result in insufficient sulfur utilization, severe polarization, and poor cyclic stability. Herein, sulfiphilic few-layered MoSe 2 nanoflakes decorated rGO (MoSe 2 @rGO) hybrid has been synthesized through a facile hydrothermal method and for the first time, is used as a conceptually new-style sulfur host for LSBs. Specifically, MoSe 2 @rGO not only strongly interacts with polysulfides but also dynamically strengthens polysulfide redox reactions. The polarization problem is effectively alleviated by relying on the sulfiphilic MoSe 2 . Moreover, MoSe 2 @rGO is demonstrated to be beneficial for the fast nucleation and uniform deposition of Li 2 S, contributing to the high discharge capacity and good cyclic stability. A high initial capacity of 1608 mAh g −1 at 0.1 C, a slow decay rate of 0.042% per loop at 0.25 C, and a high reversible capacity of 870 mAh g −1 with areal sulfur loading of 4.2 mg cm −2 at 0.3 C are obtained. The concept of introducing sulfiphilic transition-metal selenides into the LSBs system can stimulate engineering of novel architectures with enhanced properties for various energy-storage devices.

Fabricating polydopamine-coated MoSe2-wrapped hollow mesoporous silica nanoplatform for controlled drug release and chemo-photothermal therapy

Song Chai,Shifeng Kan,Ran Sun,Ruijuan Zhou,Yi Sun,Wenhua Chen,Bo Yu

MoSe2–CoSe2/N-doped graphene aerogel nanocomposites with high capacity and excellent stability for lithium-ion batteries

Xiang Zhang,Jun Zhou,Yuying Zheng,Dongyang Chen

Bimetallic transition-metal selenides have emerged as promising anode materials for lithium-ion batteries (LIBs). However, they suffer from rapid capacity fading which is originated from significant chemical and mechanical degradation during lithiation/delithiation processes. Herein, nitrogen-doped graphene aerogel (NGA) with high porosity is prepared via a templated method and serves as the matrix for the uniform growth of sheet-like binary transition-metal selenides (MoSe 2 –CoSe 2 ). The porous NGA with high specific surface area provides a stable and conductive network, which can accelerate electron transmission and shorten the diffusion distance of Li ions . Furthermore, the MoSe 2 –CoSe 2 nanosheets can offer adequate specific capacity because of its high accessibility and multiple redox properties. As a result, the MoSe 2 –CoSe 2 /NGA-10 composite delivers high Li-ion storage capacity (1260 mAh g −1 at 0.1 A g −1 ), excellent rate capability (702 mAh g −1 at 5 A g −1 ), and stable cycling performance (914 mAh g −1 at 1 A g −1 after 200 cycles), demonstrating its great potential for LIB applications.