APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Xue Bai,Yanyan Du,Xiaoyun Hu,Yudong He,Chunliang He,Enzhou Liu,Jun Fan
A novel RP-MoS 2 /rGO nanocomposite as low-cost, environmental sustanable, stability and high-performance photocatalyst was successfully fabricated for the first time through a facile two-step hydrothermal method. Even without a noble-metal cocatalyst, the introduction of MoS 2 /rGO hybrid made RP exhibit excellent photocatalytic performance, including photoreduction of Cr (VI) and photooxidation of different organic pollutants, owing to the increased number of excited electrons/holes and enhanced separation efficiency of charge carriers. Importantly, the synergy of photocatalytic reduction and oxidation, as well as photocatalysis and adsorption played an important role in enhancing photocatalytic activity and reaching a high efficiency. Besides, the chemical structure of the RP-MoS 2 /rGO with P–S and P O bands ensure the stability of the nanocomposite materials. Overall, the photocatalytic elimination of the Cr (VI)-Organic molecule coexistence system in this work shows promising application to treatment the reality wastewater.
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Journal of Materials Chemistry A
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2018
·Vol. 6
·期 22
·10433-10440
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IF 9.931
Yiping Hu,Feng Li,Yu Long,Haidong Yang,Lili Gao,Xuefeng Long,Haiguo Hu,Na Xu,Jun Jin,Jiantai Ma
Searching for highly efficient, stable and non-noble metal electrocatalysts for the hydrogen/oxygen evolution reaction (HER/OER) is crucial to renewable-energy conversion systems. Cobalt phosphosulfide (CoPS) is regarded as a promising electrocatalyst for the HER in acid solution. Nonetheless, there are no studies of its HER and OER activity in basic solution. Herein, we engineer a novel and highly efficient water splitting electrocatalyst of ultrafine CoPS nanoparticles (NPs) encapsulated in N, P, and S tri-doped porous carbon (CoPS@NPS-C) through metal–organic frameworks (MOFs) and commercial carbon black (XC-72) as precursors. The abundant and evenly distributed metals of MOFs form ultrafine CoPS NPs, and the rich N organic ligands of MOFs and XC-72 are shaped into the NPS-C to protect CoPS NPs leading to long-term stability in water-splitting applications. Meanwhile, the strong interaction between CoPS and NPS-C in this special structure not only ensures the high activity of the HER in acid solution and the OER in alkaline solution, but also maintains good HER performance in alkaline solution. The results display that the novel structure electrocatalyst of CoPS@NPS-C has great potential in water-splitting applications.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Wei Wang,Guoxin Xie,Jianbin Luo
Superlubricity is defined as a sliding regime in which friction, or the resistance to sliding of two relatively moving surfaces, almost vanishes. From a practical point of view, the development and use of new materials that can enable superlubricity (coefficient of friction, COF < 0.01) in moving mechanical systems will have huge positive impact on energy-saving and emission reduction. In this work, the use of a new two-dimensional material, black phosphorus (BP) as a high-performance water-based lubricant additive that can significantly reduce friction and achieve superlubricity has been explored. A lowest COF value of 0.0006 ever measured by an application-orientated ball-on-plate tribometer has been found. Robust superlubricity in the aqueous solution with ultrafine BP nanosheets modified by NaOH (BP-OH) has been observed for a wide range of additive concentrations, contact pressures, and sliding velocities owing to the very low shear resistance of the water layer retained by BP-OH nanosheets. This finding has the potential of opening up a new approach to dramatically reduce or even eliminate friction by using BP nanomaterials as lubricant additives.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Xiwei Zhang,Dan Meng,Zhenjie Tang,Dan Hu,Huijuan Geng,Huiyuan Zheng,Shuaipu Zang,Zhongrui Yu,Panpan Peng
Radial 1-D nano-heterojunctions have distinct optoelectronic properties. However, their complex fabrication process is still the bottleneck of device applications. Herein, a facile atomic layer deposition (ALD) method was used to coat a polycrystalline CdS thin film with high uniformity and controllable thickness on the surface of the as-synthesized p-type ZnSe nanowires, for fabricating radial 1-D ZnSe-CdS nano-heterojunctions. The nano-heterojunctions exhibited excellent optoelectronic properties. Under blue/violet light, the nano-heterojunctions obtained a response radio of ∼5 × 10 3 , a responsitivity of ∼1.43 A/W, a gain of ∼3.78 and a detectivity of ∼0.57 × 10 12 cmHz 1/2 W −1 at zero bias. Furthermore, the nano-heterojunction also showed obvious photovoltaic characteristic with a power conversion efficiency of ∼0.96%. This method is expected to play an important role in nano-heterojunction construction and their device applications.
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TRIBOLOGY LETTERS
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2018
·Vol. 66
·期 2
·1-11
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IF 2.182
Lv Yan,Wang Wei,Xie Guoxin,Luo Jianbin
Black phosphorus (BP), a newly emerging two-dimensional material, has recently received considerable attention. Our recent work suggested that BP nanosheets exhibit extraordinary mechanical and lubrication properties. In the present work, the tribological properties of polyetheretherketone (PEEK)/polytetrafluoroethylene (PTFE) and carbon fiber (CF)/PTFE composites with BP nanosheets have been investigated. The morphologies and surface element distribution of the worn tracks of the tribopair surfaces were examined by different analytical techniques. The results show that the coefficients of friction (COFs) of both the PEEK/PTFE and CF/PTFE composites decreased dramatically after the addition of BP nanosheets, and the minimum COF of the composite was 0.04, which was a quarter of that of the PTFE composite without BP nanosheets. After BP nanosheets were added into the composites, the wear rate of the PTFE/PEEK composite decreased dramatically, while that of the CF/PTFE composite increased significantly with the increase in the filler concentration. The analysis of the lubrication mechanism of the PTFE composite with BP nanosheets suggested that BP nanosheets could be constantly supplied into the contact area and gradually formed a BP film composed of phosphorus oxide and phosphoric acid on the counterpart surface instead of the formation of PTFE transfer film. The formed BP transfer film promoted the friction reduction and the disappearance of the adhesive wear.
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ChemElectroChem
·
2018
·Vol. 5
·期 11
·1467-1473
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IF 4.446
Bei Wang,Qiang Ru,Chiquan Su,Shikun Cheng,Peng Liu,Qing Guo,Xianhua Hou,Shichen Su,Francis Chi-Chung Ling
Graphical Easy, yet effective : A facile and cost-effective one-step strategy was introduced to fabricate a 3D mesoporous Ni 12 P 5 /carbon nanotubes (Ni 12 P 5 /CNTs) hybrid by using natural abundant and non-toxic red phosphorous (RP) at low-temperature of 160 °C. The electrochemical results confirm that this unique 3D architecture has improved electrochemical performance. A unique 3D mesoporous interconnected Ni 12 P 5 /CNTs hybrid was constructed by a facile one-step hydrothermal method and investigated as anode toward lithium-ion batteries. The results show that Ni 12 P 5 nanoparticles are well hinged by the flexible CNTs, forming a hierarchically integrated structure. The system delivers an initial discharge capacity of 1108 mAh g −1 and a high reversible discharge capacity of 676 mAh g −1 after 120 cycles at 200 mA g −1 . Furthermore, the hybrid also achieved long-term cycling stability and good rate capability, such as 584 mAh g −1 at a current density of 400 mA g −1 after 240 cycles and 245 mAh g −1 at a rate current density of 3200 mA g −1 . The enhanced electrochemical performance could be attributed to the synergistic effect of increased specific surface area, mesoporous structures, and 3D interconnected conductive network
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Nature Nanotechnology
·
2015
·Vol. 10
·期 7
·608-613
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IF 34.048
Li Likai,Ye Guo Jun,Tran Vy,Fei Ruixiang,Chen Guorui,Wang Huichao,Wang Jian,Watanabe Kenji,Taniguchi Takashi,Yang Li,Chen Xian Hui,Zhang Yuanbo
For decades, two-dimensional electron gases (2DEG) have allowed important experimental discoveries1,2 and conceptual developments in condensed-matter physics3. When combined with the unique electronic properties of two-dimensional crystals, they allow rich physical phenomena to be probed at the quantum level4,5. Here, we create a 2DEG in black phosphorus—a recently added member of the two-dimensional atomic crystal family6,7,8—using a gate electric field. The black phosphorus film hosting the 2DEG is placed on a hexagonal boron nitride substrate. The resulting high carrier mobility in the 2DEG allows the observation of quantum oscillations. The temperature and magnetic field dependence of these oscillations yields crucial information about the system, such as cyclotron mass and lifetime of its charge carriers. Our results, coupled with the fact that black phosphorus possesses anisotropic energy bands with a tunable, direct bandgap6,7,8,9,10,11,12,13,14,15, distinguish black phosphorus 2DEG as a system with unique electronic and optoelectronic properties.
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Nanoscale
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2014
·Vol. 7
·期 3
·877-884
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IF 6.739
Zenghui Wang,Hao Jia,Xuqian Zheng,Rui Yang,Zefang Wang,G. J. Ye,X. H. Chen,Jie Shan,Philip X.-L. Feng
We report on the experimental demonstration of a new type of nanoelectromechanical resonator based on black phosphorus crystals. Facilitated by a highly efficient dry transfer technique, crystalline black phosphorus flakes are harnessed to enable drumhead resonators vibrating at high and very high frequencies (HF and VHF bands, up to ∼100 MHz). We investigate the resonant vibrational responses from the black phosphorus crystals by devising both electrical and optical excitation schemes, in addition to measuring the undriven thermomechanical motions in these suspended nanostructures. Flakes with thicknesses from ∼200 nm down to ∼20 nm clearly exhibit elastic characteristics transitioning from the plate to the membrane regime. Both frequency- and time-domain measurements of the nanomechanical resonances show that very thin black phosphorus crystals hold interesting potential for moveable and vibratory devices and for semiconductor transducers where high-speed mechanical motions could be coupled to the attractive electronic and optoelectronic properties of black phosphorus.
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MATERIALS RESEARCH BULLETIN
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2015
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IF 2.288
Weibing Li,Jiguang Yue,Fangxia Hua,Chang Feng,Yuyu Bu,Zhuoyuan Chen
Red phosphorus with rough surface (SRP) was prepared by catalyst-assisted hydrothermal synthesis using Co 2+ catalyst. The photocatalytic Rhodamine B (RhB) degradation of red phosphorus (RP) and SRP was studied for the first time in this work. Rough surface can enhance the dye adsorption ability of RP. About 75% RhB was absorbed by SRP after 30-min adsorption in 100 ml RhB solution with concentration of 10 mg l −1 in dark. After only 10 min of illumination by visible light, more than 95% RhB was degraded, indicating that SRP has a great application potential in the area of photocatalysis. The photocatalytic RhB degradation properties of RP are much weaker than those of SRP. The increase of the number of the active sites for the photocatalytic reactions, the electron mobility and the lifetime of the photogenerated electrons cause the significant improvement of the photocatalytic performance of SRP based on the experimental results obtained.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2017
·Vol. 2017
·期 31
·3729-3735
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IF 2.444
Bei Wang,Qiang Ru,Qing Guo,Xiaoqiu Chen,Zhen Wang,Xianhua Hou,Shejun Hu
Graphical Mesoporous 1D CoP nanorods were synthesized by a hydrothermal method and subsequent low-temperature phosphorization. As an anode for Li ion batteries, CoP delivers a high discharge capacity (894 mAh g –1 ; 300 cycles) at a current density of 500 mA g –1 . At a current density of 4000 mA g –1 , the rate capacity is 467 mAh g –1 , showing good reversible capacity, cycling stability, and rate capability. One-dimensional mesoporous CoP nanorods have been successfully synthesized via a facile hydrothermal method and subsequent low-temperature thermal phosphorization treatment. At a current density of 500 mA g –1 , CoP nanorods as anode materials for lithium ion batteries deliver a high discharge capacity of 894 mAh g –1 after 300 cycles, with a coulombic efficiency of over 99 %. Even at a high current rate of 4000 mA g –1 , the discharge capacity of the CoP electrode can still retain 467 mAh g –1 . The results suggest that the introduction of cobalt and the special mesoporous nanorods play important roles in enhancing the electrochemical properties. Therefore, this rodlike CoP electrode is competent as a promising anode material for high-performance lithium-ion batteries.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 9
·8976-8984
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IF 2.76
Guo Huiying,Li Hao,Liang Ni,Chen Fangyuan,Liao Shaohua,Zhang Di,Wu Min,Pan Bo
Bisphenol S (BPS), a new bisphenol analog, is considered to be a potential replacement for bisphenol A (BPA), which has gained concern because of its potentially adverse health impacts. Therefore, studies are needed to investigate the environmental fate and risks of this compound. In this study, the adsorption of BPS and four structural analogs on multi-walled carbon nanotubes (MWCNTs) and graphite (GP) were investigated. When solid-phase concentrations were normalized by the surface areas, oxygen-containing functional groups on the absorbents showed a positive impact on phenol sorption but inhibited the sorption of chemicals with two benzene rings. Among BPS analogs, diphenyl sulfone showed the lowest sorption when hydrophobic effects were ruled out. Chemicals with a butterfly structure, formed between the two benzene rings, showed consistently high sorption on MWCNTs, independent of the substituted electron-donating or accepting functional groups. This study emphasizes the importance of chemical conformation on organic, contaminant sorption on engineered, carbonaceous materials.
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INORGANIC CHEMISTRY
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2016
·
IF 4.82
Yu-Hang Fan,Xiao-Ming Jiang,Bin-Wen Liu,Shu-Fang Li,Wei-Huan Guo,Hui-Yi Zeng,Guo-Cong Guo,Jin-Shun Huang
Two new phases in the Ag–Cd–P–S system containing two second-order Jahn–Teller (SOJT) distorted d10 cations (Cd2+ and Ag+), namely, Ag2Cd(P2S6) (1) and AgCd3(PS4)S2 (2), are obtained via medium-temperature solid-state synthesis. Compound 1 exhibits a two-dimensional layered structure and undergoes a first-order structural phase transition at approximately 280 °C. This outcome can be ascribed to the significant mismatch in the expansion coefficients between Cd–S (Ag–S) and P–P (P–S) bonds evaluated through bond valence theory. The three-dimensional non-centrosymmetric (NCS) framework of 2 is constructed by two types of tetrahedral layers consisting of corner-shared CdS4, AgS4, and PS4 tetrahedra. Compound 2 exhibits second harmonic generation (SHG) intensity of 0.45 times that of commercial AgGaS2 (AGS) at a laser irradiation of 1.85 μm and an optical band gap of 2.56 eV, and no intrinsic vibrational absorption of chemical bonds is observed in the range of 2.5–18.2 μm. Both phase transition in 1 and SHG properties in 2 are closely related to the SOJT distorted d10 cations and diverse phosphorus–sulfur polyanions (PaSb)n−, which together can easily result in NCS distorted structures and interesting properties.
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