APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Junjie Pan,Xin Sun,Tao Wang,Zetao Zhu,Yuping He,Wei Xia,Jianping He
Magnetic metallic materials compounded with dielectric loss materials are promising for efficient microwave absorption as a result of the synergistic effect between dielectric loss and magnetic loss, as well as the optimized impedance matching. In this paper, porous coin-like structured Fe@MoS 2 composite has been fabricated via solvothermal method accompanied by subsequent heat treatment under H 2 /Ar atmosphere. The structure and morphology of as-prepared Fe@MoS 2 composite indicates that MoS 2 nanosheets with the two-dimensional (2D) structure are well dispersed on the porous coin-like Fe micro-sheets to form a core-shell structure. Particularly, the addition of MoS 2 regulates the permittivity as well as improves the impedance matching of the Fe@MoS 2 composite. The as-prepared composite shows efficient microwave absorption properties with the maximum effective absorption bandwidth (reflection loss below −10 dB) of about 4.73 GHz (11.13–15.86 GHz) at the corresponding coating thickness of 2.0 mm, accompanied by the minimum reflection loss of about −37.02 dB. When the calcination temperature increases to 650 °C, the effective microwave absorption frequency band shifts to the lower frequency (9.91–14.19 GHz) with the minimum reflection loss of about −35.5 dB under the coating thickness of 2.0 mm. Considering the efficient microwave attenuation, the as-fabricated porous coin-like Fe@MoS 2 composite can be a hopeful candidate in the field of microwave absorption.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 36
·12671-12683
·
IF 4.099
Sugang Meng,Yanjuan Cui,Hao Wang,Xiuzhen Zheng,Xianliang Fu,Shifu Chen
The development of stable noble metal-free photocatalysts with efficient separation and transportation of the photogenerated electrons–holes is of crucial importance for promoting the application of photocatalysis technology. Herein, we propose an electron transfer strategy by reasonable design and fabrication of novel 0D NiSx nanosheets as a co-catalyst on the surface of 1D CdS nanorods (CdS-NRs) to enhance photocatalytic hydrogen evaluation and contamination (Cr(VI), rhodamine B and bisphenol A) removal in water. Under visible light irradiation, the 0D–1D NiSx/CdS-NR nanocomposite with 1.5% NiSx loading gave a hydrogen evolution rate of 5.98 mmol h−1 g−1, which is about 5.3 times and 1.9 times higher than that of the native CdS-NRs and the optimal 1% Pt/CdS-NRs, respectively. Notably, good stability in the recycling test and a high apparent quantum efficiency of about 69.9% at 420 nm were also obtained. The 1.5% NiSx/CdS-NRs exhibited enhanced photocatalytic contamination degradation efficiency of about 2 times higher than pure CdS-NRs. In this hybrid photocatalyst, 0D NiSx nanosheets came into intimate interfacial contact with the surface of 1D CdS-NRs and played a similar role as noble metals, which could effectively improve the separation, transportation efficiencies and lifetime of photogenerated charge, and thus enhance the photocatalytic performance of CdS-NRs with more efficient conversion of solar energy. This work shows not only a possibility for the utilization of noble metal-free NiSx as a co-catalyst in the photocatalysis, but also provides new insight into the design and fabrication of high-performance composite photocatalysts (such as NiSx/g-C3N4 and NiSx/Zn3In2S6).
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Hang Zhao,Jinhua Wu,Jianlong Li,Hao Wu,Yun Zhang,Heng Liu
MoS 2 has been investigated extensively as novel energy storage materials because of its unique physical and chemical properties. Herein, a flexible Three-Dimensional (3D) free-standing composite is rationally designed and synthesized by growing MoS 2 nanosheets onto carbonized melamine foam. Afterwards, nitrogen-doped carbon (NC) coating is created on the bare MoS 2 nanosheets depends on dopamine self-polymerization. The composite can be used directly as a free-standing anode for lithium-ion batteries. It exhibits high reversible lithium storage capacity with good cyclic performance (573.8 mAh g −1 at current density of 500 mA g −1 after 200 cycles) and rate capability (536.9 mAh g −1 at current density of 2000 mA g −1 ). The outstanding electrochemistry properties are mainly attributed to the well-designed architecture. The interconnected carbon skeleton provides 3D fast transport paths for electron. NC coating on MoS 2 nanosheets and the carbon filled in the interspaces between MoS 2 nanosheets serves as conductive matrix which enhances the electrical conductivity, expands the path of electron transport and accelerates electron transfer.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Keyu Tao,Yun Gong,Qingfeng Zhou,Jianhua Lin
Co-Mo-O (Co 1.2 MoO 4.2 ·1.3H 2 O)/Ni 3 S 2 nanosheet arrays were in-situ grown directly on Ni foam (NF) by a facile two-step hydrothermal reaction , in which the untrathin Co-Mo-O nanosheets are connected to each other into a three-dimensional (3D) porous hierarchical architecture with Ni 3 S 2 entrapped on the underneath Ni support. The resulting Co-Mo-O/Ni 3 S 2 /NF exhibits an excellent electrocatalytic activity for oxygen evolution reaction (OER) in KOH solution, which yields a 50 mA cm −2 of OER current density at an overpotential of 0.29 V, outperforming the state-of-the-art noble RuO 2 (η 50 = 0.42 V), Co-Mo-O/NF (η 50 = 0.33 V) and Ni 3 S 2 /NF (η 50 = 0.31 V). And it demonstrates a high specific capacity of 340 mAh g −1 at 2 mA cm −2 with good capability (82.1% of the retention at 32 mA cm −2 ) in basic solution when used as supercapacitor electrode, which is superior to those of Co-Mo-O/NF (183 mAh g −1 ) and Ni 3 S 2 /NF (70 mAh g −1 ). The outstanding electrochemical performance of Co-Mo-O/Ni 3 S 2 /NF is associated with the synergistic effect of the individual components as well as the nanosheets directly grown on Ni conducting support with more active sites exposed. Furthermore, Co-Mo-O/Ni 3 S 2 /NF displays good durability in 12 h-electrolysis experiment for OER and 10000 charge-discharge cycles. It is expected to benefit from Ni 3 S 2 entrapped by the protective layer of 3D porous Co-Mo-O nanosheet arrays, which not only can provide channel for electrolyte ion to pass through, but also improve the stability of Ni 3 S 2 . In addition, the fabricated Co-Mo-O/Ni 3 S 2 /NF//Activated carbon (AC) asymmetrical supercapacitor shows an ultra-high energy density of 57.9 Wh kg −1 at a power density of 1.1 kW kg −1 .
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Kunlun Yang,Jiasheng Zhou,Zimo Lou,Xurui Zhou,Yuanli Liu,Yizhou Li,Shams Ali Baig,Xinhua Xu
Fe-Mn binary oxides (FMBO) with different Fe/Mn molar ratios were synthesized to investigate the influence of the changed iron oxides forms and the manganese oxide on the removal efficacy of Sb(V) from water under neutral pH. The characterization tests by electron microscopy and X-ray diffraction spectroscopy showed that FMBO gradually changed from granular to aciculiform or fibrous structure and their crystalline degree increased with the decreasing Mn content. The ferric oxides in FMBO transformed from 2-L ferrihydrite-like substance with amorphous state to goethite or lepidocrocite with high crystalline as the amount of added Mn reduced during the preparation. The Sb(V) adsorption rates and capacities of FMBO both decreased and the influence of pH on the Sb(V) removal became greater with the decreasing Mn oxide content. All the results indicated that the addition of Mn could greatly improve the Sb(V) removal performance of FMBO through promoting the formation and preventing the transformation of amorphous ferric oxide in FMBO during the preparation, whose Sb(V) adsorption ability was confirmed to be stronger than that of goethite or lepidocrocite. Further exploration indicated the complexation reaction between Sb(V) and amorphous ferric oxide played a key role in Sb(V) adsorption by FMBO. Meanwhile, FMBO with a Fe/Mn molar ratio of 3:1 (FMBO 3 ) exhibited excellent regeneration performance and the amorphous iron oxide in FMBO 3 gradually transformed into crystalline iron oxide during the consecutive recycling.
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JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 12
·1-8
·
IF 2.127
Dai Xiaohui,Han Zhenwei,Fan Hai,Ai Shiyun
Heteroatom doping can drastically alter electronic characteristics of carbon nitride quantum dots, thus resulting in unusual properties and related applications. Herein, we used sulfur as the doping element and investigated the influence of doping on the electronic distribution of carbon nitride and the corresponding fluorescent property. A simple synthetic strategy was applied to prepare sulfur-doped carbon nitride (S-g-C 3 N 4 ) quantum dots through ultrasonic treatment of bulk S-g-C 3 N 4 . Characterization results demonstrated that the prepared S-g-C 3 N 4 quantum dots with an average size of 2.0 nm were successfully prepared. Fluorescent properties indicated that S-g-C 3 N 4 quantum dots have an emission peak at 460 nm and cover the emission spectra region up to 550 nm. Furthermore, the fluorescent intensity is greatly increased due to the sonication of bulk S-g-C 3 N 4 into quantum dots. As a result, S-g-C 3 N 4 quantum dots not only show a blue cell imaging, but have a bright green color. Therefore, S-g-C 3 N 4 quantum dot is a promising candidate for bioimaging benefiting from the efficient fluorescent property, good biocompatibility, and low toxicity.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Zhuo Guo,Tianshuai Sun,Yahui Li,Hailan Kang,Yuhan Che,Yan Zhang,Jinlin Lu
In this work, mesoporous WS 2 with high surface area was prepared by hard template method . First, a one-step nanocasting generates metal precursor@mesoporous silica SBA-15 composites. A hydrothermal method is subsequently adopted to convert the precursors to sulfides in the confined nanochannels . After etching silica SBA-15, mesoporous layered metal sulfide crystals were obtained as the products. Then, we have put forward a new catalyst based on mesoporous WS 2, RGO nanosheets and Pt nanoparticles as a highly efficient electrocatalyst for hydrogen evolution . The Pt/WG-2 nanostructure electrocatalyst in this report exhibits excellent performance with a small Tafel slope of 47 mV dec −1 , long-term durability and an overpotential of 95 mV in 0.5 M H 2 SO 4 for the hydrogen evolution reaction (HER).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Meng Yuan,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Si-Xin Wu
Design and preparation of high performance photocatalysts are always the keys for photocatalytic hydrogen production by using green and unlimited solar energy. In this work, we present the synthesis of Cu 2 ZnSnS 4 (CZTS) decorated CdS nanorods and their use for visible-light-driven photocatalytic hydrogen production. The as-synthesized CZTS decorated CdS nanorods exhibit much higher visible-light-driven photocatalytic hydrogen production performance than that of individual CdS nanorods and individual CZTS nanoparticles . Specifically, the hydrogen production rate of representative CZTS decorated CdS nanorods was 48-times and 165-times higher than that of individual CdS nanorods and individual CZTS nanoparticles. The enhanced photocatalytic hydrogen production performance may be contributed by the p-n heterojunction as well as the synergistic effect between CdS nanorods and CZTS particles. The present work not only reported new low-cost and highly efficient photocatalysts for visible-light-driven photocatalytic hydrogen production, but also provided new method for the design and preparation of high performance visible-light-driven heterostructured photocatalysts for photocatalytic hydrogen production.
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高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 47
·13013-13022
·
IF 5.976
Dong Lu,Yiping Tang,Jinwei Gao,Qianming Wang
In contrast to conventional nanomaterials or organic dyes, carbon dots possess a variety of appealing properties including chemical inertness and easy manipulation and they can be dispersed in water. Herein, the use of a concentrated solar irradiation sintering strategy for the rapid and efficient assembly of carbon dots (CDs) has been reported for the first time. This novel alternative pathway effectively uses a renewable source and the process is feasible and environmentally sustainable. Three kinds of CDs were obtained, which demonstrate blue, green and red luminescence. Highly efficient blue-emitting CDs with quantum yield as high as 81% have been realized. The blue and red carbon dots give rise to excitation-independent emission peaks at 443 and 592 nm, respectively; however, the green CDs feature a continuous shift and the evolution of emission curves varies from 480 to 538 nm. By regulating the composition and ratios of these tri-color carbon dots, the emission band generates peaks from blue to red light, which cover almost the entire visible light range. Upon a single ultra-violet excitation at 365 nm, a white-light emission with CIE coordinates of (0.28, 0.33) was detected and the signal was very close to pure white light (0.33, 0.33). This study introduces a new method for fabricating low-cost nanoparticles as potential phosphors for light-emitting uses.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Qingkun Hu,Shuqin Liu,Xiao Chen,Jianqiao Xu,Fang Zhu,Gangfeng Ouyang
Recent works of designing excellent adsorbents emphasized on the specific surface areas and porosities of the materials. This study presents the influence of morphological modulation on extraction efficiencies of materials for the first time. Sea urchin-like nanoporous carbon (NPC), derived from metal organic framework (MOF), was synthesized and fabricated as solid phase microextraction (SPME) device. The morphological modulated structure of the NPC, with enhanced effective adsorption sites produced by the pointed and sharp edges, could improve the extraction efficiencies of the NPC. Comparing with the unmodulated one, NPC with morphological modulation possessed higher extraction efficiencies (2 flod) as well as accelerated sampling rates (5 flod) on benzene series compounds (BTEX), improving the sensitivity of the sampling method (limits of detection ranged from 0.08 ng L −1 to 0.36 ng L −1 ). Moreover, it was also the first time that the moisture sensitive MOF-derived NPC was exploited as the SPME adsorbent. In general, this study was expected to be an important advance in broadening the approaches on designing a superior SPME adsorbents not only emphasizing on the specific surface area as well as porosity but also the morphology.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yue Bao,Yuping Huang,Xiong Song,Jin Long,Suqing Wang,Liang-Xin Ding,Haihui Wang
Activation is a common strategy to tailor microstructure of carbon materials . A new activation combined with heteroatom doping of carbon nanofibers is proposed to synthesize the N, S-doped carbon nanofibers (NSCNFs). After electrospinning and followed thermal treatment with thiourea , the diameter of the as-obtained NSCNFs decreases with much more abundant pore structure and functionalized with S-containing oxygen groups compared with that obtained without activation. The increased specific surface area and pore volume are beneficial to facilitate the Na + diffusion and provide more active sites to increase adsorption capacitance and facilitate pseudo-capacitive reactions. Also, the S-containing oxygen groups contribute to pseudo-capacitance by faradaic reactions. As a result, capacitive behavior is boosted hence leading to a excellent rate capability and cycling stability. The flexible and freestanding NSCNFs film is directly used as anode for sodium-ion batteries (NIBs) and shows excellent rate capability with reversible capacity of 147 and 133 mA h g -1 at 10 and 30 A g −1 , respectively. Remarkably, ultra-long cyclic life is also achieved with 90.8% capacity retention after 6000 cycles at 10 A g −1 . Such electrochemical performance makes NSCNFs promising to be used in high power and durable NIBs. This activation strategy can also be expanded to functionalize other carbon materials.
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RSC Advances
·
2018
·Vol. 8
·期 66
·37811-37816
·
IF 2.936
Cejun Hu,Yingna Chang,Ruida Chen,Jijin Yang,Tianhui Xie,Zheng Chang,Guoxin Zhang,Wen Liu,Xiaoming Sun
The intrinsic polysulfide shuttle in lithium–sulfur (Li–S) batteries have significantly limited their practical applications. Conductive carbon materials with heteroatom doping and rich porosity is the most common strategy for the effective prevention of polysulfide shuttle, but are usually obtained with high costs and tedious procedures. Herein, we managed to obtain highly porous N, S-codoped carbon materials (NS-C) through treating waste plastic of polyvinylchloride (PVC) with KOH. The resulting NS-C was revealed to be highly efficient hosts for sulfur cathode, achieving large reversible capacities of 1205 mA h g−1 and 836 mA h g−1 at 0.1C and 1.0C, respectively, and remaining at 550 mA h g−1 after 500 cycles at 1C rate, showing an outstanding cycling stability. The significantly enhanced cycling performance was mainly ascribed to both the hierarchically porous structure and heavy N, S co-dopants, which respectively provided physical blocks and chemical affinity for the efficient immobilization of intermediate lithium polysulfides. The results provide an effective paradigm in the surface chemistry and sulfur cathode materials design for high-performance Li–S batteries and a new application for recycled plastic waste.
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