Nanoscale
·
2015
·Vol. 8
·期 1
·440-450
·
IF 7.394
Yuxin Wu,Mingquan Xu,Xi Chen,Shuanglei Yang,Hanshuo Wu,Jun Pan,Xiang Xiong
A novel nanostructure of perpendicular ultrathin MoSe2 nanosheets directly grown on graphene was produced by a facile hydrothermal method in the presence of CTAB. The vertically-oriented and ultrathin MoSe2 nanosheets distribute uniformly on the surface of graphene, and the nanosheets are typically 2–3 layers, which is confirmed by TEM and red shift of the A1g Raman peak. In comparison with pure MoSe2 and MoSe2 nanospheres on graphene, vertically oriented MoSe2 nanosheets on graphene show enhanced organic dye adsorption ability and photocatalytic performance in the degradation of MB, RhB and MO under dark conditions and visible light irradiation. The excellent photocatalytic activity may be contributed by the unique perpendicular MoSe2 nanosheets with fully exposed active edges and hybridized with graphene for reduced electron–hole pair recombination.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 7
·3143-3152
·
IF 2.289
Li Jie,Lei Xiaoke,Qin Furong,Zong Chuanxin,Liu Lele,Zhang Kai
MoSe 2 nanosheets embedded in a mesoporous carbon matrix is synthesized through a facile route, where molybdenum source is recrystallized forming nanocrystals and further react with selenium. To obtain fine nanocrystals, freeze-drying technique is used to creating a large subcooled temperature. With low MoSe 2 content of ~ 54 wt%, the mesoporous MoSe 2 /C composite shows an initial capacity of 450 mA h g −1 and a reversible capacity of 276 mA h g −1 after 200 cycles.
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研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Mianmian Wu,Nan Li,Shixiang Zuo,Wenjing Shen,Guifang Sun,Qingfei Li,Minghao Shi,Jiangquan Ma
Piezocatalysis is a promising technology to address environmental pollution by converting mechanical energy into chemical energy. Herein, MoSe2 nanosheets with different 1T phase percentages (ranging from 30 to 80%) were constructed by adjusting hydrothermal temperature. Moreover, the roles of phase engineering in the piezocatalysis were thoroughly investigated by degrading rhodamine B and reducing Cr(VI) in ultrasonic vibration conditions. In particular, MoSe2 prepared at 220 °C (MoSe2-220) exhibits ultrahigh observed constant kobs and degradation rate k, which is superior to most reported catalysts to date. The experimental results indicate that the introduction of the 1T phase increases the active sites of the material, improves the conductivity, and inhibits the recombination of electrons and holes. Moreover, an internal electric field in the 2H phase induced by piezoelectric polarization is facilitated to separate electron–hole pairs, enabling the degradation and reduction to proceed. The capture experiments and EPR tests further confirm that •O2– and •OH are main reactive species, and a rational mechanism is finally put forward. This study offers a clear understanding of phase engineering in piezocatalysis and provides an efficiency strategy to construct highly efficient piezocatalysts.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xuan Luo,Xiangpeng Kong,Peng He,Jian Shao,Kang Li,Weiwei Zhao
The rational design and assembly specific structures consisting of multiple components with distinctive features are promising strategies for developing advanced materials for efficient sodium storage. Herein, a novel hierarchical sandwich-liked structure MoSe 2 nanosheet array is designed and synthesized, in which MoSe 2 nanosheet through strong interfacial interaction is encapsulated in two dimensional carbon framework that improves electrical conductivity and Na + diffusion kinetic. Moreover, the carbon protective layer reinforces the stability of structure and maintains electrochemical activity during long-term charging/discharging process. The density functional theory calculation (DFT) further confirms carbon incorporation can reduce Na + diffusion energy barrier for enhancing the reaction kinetics. With the obtained NC/MoSe 2 @NC as free-standing electrodes for SIBs, it achieves a reversible capacity of 632 mAh g −1 at 0.2 A g −1 , or actual capacity of 421 mAh g −1 by removing contributed capacity of the carbon cloth substrate, and excellent long cycling stability. By matching with Na 3 V 2 (PO 4 ) 3 /C cathode, the sodium full cell displays a high energy density of 186.2 Wh kg −1 with a power density of 121.2 W kg −1 . This current design and fabrication strategy manifests promising prospect for exploring efficient electrode materials for sodium storage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
JiuWu Wang,Caini Yang,Siyao Chen,Yinping Wu,Xian Sun,Chenguang Huang,Rui Tang,Jiasheng Ke,Yi Dai,Yue Situ,Hong Huang
High-performance sodium-ion batteries (SIBs) are highly expected in the field of large-scale static energy storage due to the low expenditure and abundant sodium resource. However, the sodium storage performance of anode materials for SIBs has suffered from the foot-dragging reaction kinetics arising from large-size Na + during intercalation/deintercalation, which imposes more stringent requirements on the morphology and structure of the potential anode electrodes. Herein, we successfully designed and synthesized a three-dimensional (3D) heterojunction as anode material for SIBs, which assembled by interlayer-expanded MoSe 2 nanosheets perpendicularly anchored on the nitrogen-doped branched TiO 2 @C nanofibers (MoSe 2 @NBT@CNFs). Not only does the branched TiO 2 @C nanofibers suppress the severe self-aggregation of MoSe 2 nanosheets but also buffer the volume expansion during the cycling process. Moreover, an expanded interlamellar distance of MoSe 2 nanosheets accelerate sodium ion diffusion, and strong chemical interactions between MoSe 2 nanosheets and carbon nanofibers are conducive to improve the charge-transfer kinetics and reinforce the structural durability. As might be expected, the MoSe 2 @NBT@CNFs anode can deliver excellent cycling performance with high reversibility (315.2 mAh g 1 after 800 cycles at 2 A g 1 ) and remarkable rate capability (194.2 mAh g 1 at 30 A g 1 ). The rational design strategy could offer guidance for developing high-performance metal chalcogenide-based electrode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 31
·16337-16347
·
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ziyuan Xiu,Feng Wei,Xin Zhou,Xiaojun Han
Achieving high ammonia yield and Faraday efficiency is a long-sought-after goal in electrochemical N 2 fixation. Yet, the competitive hydrogen evolution in nitrogen reduction process and the low local concentration of nitrogen on the working electrode still limited the electrocatalytic performance. In the present contribution, a Fe-MoSe 2 nanosheet functioned with C18-thiol as a nano-hydrophobic surface was rationally constructed, which efficiently facilitated the three-phase contact of gas (N 2 ), liquid (H 2 O electrolyte), and solid (electrocatalyst). The fabrication of modified hydrophobic surface not only overcame the mass transfer limitation of N 2 and increased the local concentration of N 2 molecules on the catalyst, but also reduced the proton contact with electrocatalyst to inhibit HER. The three-phase electrocatalytic system achieved a high NH 3 yield of 34.75 μg h −1 mg −1 and outstanding Faraday efficiency of 23.31%. The adsorption and activation processes during NRR process were systematically investigated by the combination of experimental results and density function theory (DFT) simulations.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2024
·Vol. 10
·期 12
·447
·
IF 4.6
Haoliang Xie,Shunxing Chen,Lianghao Yu,Guang Chen,Huile Jin,Jun Li,Shun Wang,Jichang Wang
The development of high energy and power density sodium-ion batteries (SIBs) has attracted increasing interest in the last two decades due to the abundance and cost-effectiveness of sodium resources. Herein, this study developed a self-templating synthetic method to construct MoSe2nanosheets which were intercalated by ZnSe nanoparticles and were anchored on the in situ reduced graphene oxide layers. The thus-fabricated composites exhibited excellent Coulombic efficiency, a remarkable rate capability and an exceptionally long cycle life when being utilized as the anode in SIBs. Specifically, a reversible capacity of 265 mAh g−1was achieved at 20 A g−1, which could be maintained for 6400 cycles. At an ultra-high rate of 30.0 A g−1, the anode retained a capacity of 235 mAh g−1after 9500 cycles. Such a strong performance was attributed to its unique porous structure and synergistic interactions of multi-components. The underlying sodium storage mechanism was further investigated through various techniques such as in situ X-ray diffraction spectroscopy, the galvanostatic intermittent titration method, etc. Overall, this study illustrates the great potential of clad-structured multicomponent hybrids in developing high-performance SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qingqing Jiang,Lin Wang,Yan Wang,Meihua Qin,Rui Wu,Zhengxi Huang,Hai-Jian Yang,Yongxiu Li,Tengfei Zhou,Juncheng Hu
For potassium-ion battery (PIB), it remains a huge challenge to develop an appropriate anode material to compensate the large radius of K + . MoSe 2 shows great potential for efficient K + insertion/extraction due to its unique lamellar structures with an interlayer spacing of 6.46 Å. However, pure MoSe 2 has low electronic conductivity and agglomerates during long-term cycling. In the present work, MoSe 2 nanosheets were fabricated on the N -doped porous carbon polyhedron (NPCP). The obtained product was designated as NPCP@MoSe 2 and functioned as anode materials for PIBs. NPCP@MoSe 2 displayed a promising reversible capacity (325 mAh/g at 100 mA/g after 80 cycles), long-term cycling performance (128 mAh/g at 500 mA/g after 800 cycles), and superior rate property at 5000 mA/g. The enhanced electrochemical performance of NPCP@MoSe 2 could be attributed to the rational design of hybrid structures. Notably, the hollow NPCP provide a large contact area for the interactions among the electrolytes and electro-active materials as well as partly buffer the volume expansion. The synergistic effects between MoSe 2 and NPCP could mitigate the agglomeration of MoSe 2 nanosheets. Besides, the uniformly doping N elements enhanced the conductivity of the carbon matrix, and the N -group also provided potential binding active sites for K-ion accommodation. This work paves the ideas for the design of novel anode materials with high specific capacity, good cycling stability and outstanding rate capability for PIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Hui Peng,Jiezi Zhou,Kanjun Sun,Guofu Ma,Zhiguo Zhang,Enke Feng,Ziqiang Lei
Herein, a novel asymmetric supercapacitor (ASC) with high energy density is fabricated based on the NiSe@MoSe2 nanosheet arrays and the nitrogen-doped pomelo mesocarps-based carbon nanosheet (N-PMCN) as a positive electrode and a negative electrode, respectively. The novel NiSe@MoSe2 nanosheet arrays are designed and prepared by a facile one-step hydrothermal growth method from nickel foam as a nickel precursor and nucleation framework. The N-PMCN is prepared using simultaneous CaCl2 activation and urea nitrogen-doped processes from thepomelo mesocarps as a biomass-based carbon precursor. Because of the unique nanosheet array architecture of NiSe@MoSe2 and interconnected sheet-like porous morphology with high nitrogen content (∼9 wt %) of N-PMCN, they exhibit a maximum specific capacity of 128.2 mAh g–1 and high specific capacitance of 223 F g–1 at a current density of 1 A g–1. Moreover, the assembled novel NiSe@MoSe2//N-PMCN ASC device with a maximum operating voltage of 1.65 V has demonstrated a high energy density of 32.6 Wh kg–1 at a power density of 415 W kg–1 and outstanding cycling stability with 91.4% capacitance retention after 5000 cycles in aqueous electrolyte.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Xiu-Zhi Tang,Zijian Liao,Haolong Shi,Rong Wang,Jianling Yue,Xuelong Chen
Electromagnetic wave (EMW) absorption materials have recently received considerable attention due to the increasingly severe EMW pollution. It remains challenging to fabricate a lightweight absorber with high absorption performance and low matching thickness via structure design and composition tuning. Herein, one type of fibrous composite EMW absorber with two-dimensional (2D) nanosheets coating was synthesized by electrospinning, pyrolysis and hydrothermal. The combination of cobalt nanoparticle and carbon nanofiber with decoration of 2D MoSe 2 nanosheets on the surface significantly promote the EMW absorption through dielectric/magnetic loss, impedance matching, diverse polarizations and porous structure induced multiple scattering. Owing to the coupling effect of proper combination of multiple components and hierarchical structure, a strong EMW absorption with minimum reflection loss (RL) −62.30 dB at 10.70 GHz, effective absorption bandwidth (EAB) 5.10 GHz (9.30–14.40 GHz) covering most of the X-band was achieved with absorber thickness of 2.05 mm. By adjusting the thickness to 1.60 mm, the EAB can reach 6.00 GHz (12.00–18.00 GHz), covering the whole Ku bands. This composite fibrous absorber with excellent EMW absorption performance is promising to be used in many EMW attenuation applications.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）