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Diamond and Related Materials
Elsevier Science S.A.
Diamond and Related Materials

Elsevier Science S.A.

0925-9635

Diamond and Related Materials/Journal Diamond and Related MaterialsSCIISTPEI
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    Synergetic electrochemical performance of strontium phosphate/polyaniline/graphene for high performance supercapattery devices

    Iqbal, Muhammad ZahirAlam, FaizAlam, ShahidKhan, Junaid...
    11页
    查看更多>>摘要：Supercapattery the high-performance device for energy storage purposes, is a combo of best rate capability and exceptional specific power of electrochemical supercapacitor and outstanding specific energy of the battery. In this work, one of the electrode's material for supercapattery is synthesized by blending PANI, the best conducting polymer, highly conductive and stable graphene and (Sr-3(PO4)(2)) Strontium phosphate. Structural and elemental study reveals the presence of a multiphase structure of Sr-3(PO4)(2) and a chain of flakes of PANI and graphene. The blending of these three into one another greatly enhances the performance of the device which can be depicted via the electrochemical characterizations. To optimize the quantity of these materials in a blend is an important factor to be considered. The ternary composite of Sr-3(PO4)(2), PANI and Gr reveals the excellent increase in specific capacity (Q(s)) from 220 to 422C/g as depicted by GCD measurements. These enhanced results are obtained due to promising electrochemical features as rate capability, redox active sites and controlled internal resistance. To examine the real-time performance of Sr-3(PO4)(2)/PANI/Gr electrode, supercapattery is assembled by employing activated carbon treated as negative electrode. The assembled device exhibits a specific power of 4100 W/kg and specific energy of 42.1 W h/kg with degradation of just 13% after continuous 10,000 GCD charge discharge cycles. Finally, the device b-values are calculated and their comparison with the theoretically predicted values are demonstrated. Therefore, Sr-3(PO4)(2)/PANI/Gr composites can be utilized as a novel electroactive electrode material for supercapattery applications.
      原文链接:
    • NSTL
    • Elsevier

    Active wavefronts control with graphene-functionalized terahertz Metasurfaces

    Wang, DongjieHe, XunjunYang, BowenJiang, Jiuxing...
    12页
    查看更多>>摘要：Metasurfaces, a new kind of artificial subwavelength structures, have exhibited unprecedented capabilities in wavefront control of electromagnetic waves. Currently, a series of active metasurfaces have been explored for engineering applications in anomalous refraction, ultrathin flat lens, holograms, and vortex beam generation, However, to date, most reported metasurfaces are mainly concentrated on active control on the polarization conversion and wavefront of circular polarized waves. Here, graphene-functionalized metasurfaces consisting of metallic double split ring resonators integrated with graphene (G-DSRRs) are proposed to actively control polarization conversion and wavefronts of linearly polarized waves at the terahertz region. By carefully designing spatially phase profile, anomalous reflection of linearly cross-polarized terahertz waves is demonstrated in a broadband range of frequencies. Moreover, the amplitude of the anomalous reflection terahertz wave can be dynamically tuned by varying Fermi energy via electrically doping graphene. Based on the tunable graphenefunctionalized metasurface, several polarization conversion metasurface devices including vortex beam generators, invisibility cloaks, and metalens, are successfully designed and numerical results show that their amplitudes can be actively tuned to a significant extent by doping graphene. Therefore, such graphene-functionalized metasurfaces may have potential applications in THz telecommunications, high-resolution terahertz displays, and advanced THz imaging devices.
      原文链接:
    • NSTL
    • Elsevier

    High surface area and supermicroporous activated carbon from capsicum (Capsicum annuum L.) industrial processing pulp via single-step KOH-catalyzed pyrolysis: Production optimization, characterization and its some water pollutants removal and supercapacitor performance

    Koyuncu, FilizGuzel, FuatInal, Isil Gurten
    13页
    查看更多>>摘要：In this study, we aimed to convert capsicum (Capsicum annuum L.) industrial processing pulp (CP) into low-cost and high-quality activated carbon (AC) under optimal production conditions through single-step KOH-catalyzed pyrolysis. Optimal production conditions were determined by investigating the effects on some textural characteristics of the produced ACs by changing the process variables such as mixing ratio (KOH/CP, w/w), pyrolysis temperature, and pyrolysis duration, respectively. The AC (CPAC) with the BET (Brunauer-Emmett-Teller) highest surface area (1564 m(2)/g), pore-volume (0.623 cm(3)/g), and average pore size (1.8 nm) was produced under conditions with a mixing ratio of 1.5, a pyrolysis temperature of 700 degrees C, and a duration of 1 h. It was characterized by nitrogen adsorption/desorption, Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray (EDX), X-ray Diffraction (XRD), Raman Microscopy and Fourier Transform Infrared Spectroscopy (FT-IR) techniques. In addition, the adsorption ability was determined by examining the removal performance of water pollutants such as methylene blue (MB) and methanol yellow (MY) dyes, 2,4-dichlorophenoxyacetic acid herbicide (2,4-D), diclofenac sodium drug (DCF), copper(II) ion (Cu(II)), and nitrate (NO3-), which were chosen because they are frequently detected in industrial wastewater, and found to be 294.1, 370.4, 384.6, 294.1, 212.8 and 59.5 mg/g, respectively. The supercapacitor performance of the electrodes developed from CPAC was tested as the coin size cell. The gravimetric capacitances of the electrodes were calculated as 198 F/g at the current densities of 0.5 A/g. The results of this study reveal that CPAC can be used as an alternative to commercial carbon as a clean and ecologically compatible low-cost (similar to$1.75 per kg) adsorbent that can improve water quality, and promising electrode material for low-cost and high-performance carbon-based supercapacitors.
      原文链接:
    • NSTL
    • Elsevier

    ARTICLE INFO Keywords: Adsorption Hydrogen Storage DFT Nanocone Ni atom

    Kose, AhmetYuksel, NumanFellah, M. Ferdi
    11页
    查看更多>>摘要：Hydrogen adsorption was investigated on Ni doped carbon nanocone (Ni-CNC) 180 & DEG; by Density Functional Theory (DFT). The WB97XD method was used with the 6-31G(d,p) and LanL2DZ basis sets. The electronegativity, HOMO and LUMO energies, chemical hardness, chemical potential, adsorption enthalpy and adsorption energy values have been calculated for hydrogen adsorption on Ni-CNC structure. The adsorption enthalpy value of hydrogen molecule was calculated as-27.8 kJ/mol. According to the storage capacity study for the Ni-CNC structure, it was found that this structure adsorbed eight hydrogen molecules and the hydrogen storage capacity was calculated to be ~4.3 wt%. After hydrogen adsorption, there was no significant decrease in HOMO-LUMO gap value. In addition, this situation indicates that the electrical conductivity of the Ni-CNC structure does not increase. These results show that the Ni-CNC structure cannot be used as a sensor for the hydrogen molecule, but it is a promising candidate material for hydrogen storage at room temperature.
      原文链接:
    • NSTL
    • Elsevier

    Efficient dichloromethane and toluene removal via lignin derived oxygen and nitrogen-containing activated carbons with well-developed micro-mesopore structure

    Liu, ShuangWei, WenguangWu, ShubinZhang, Fengshan...
    11页
    查看更多>>摘要：Industrial lignin is a promising carbon precursor because it is abundant and renewable, with high carbon content. However, a large amount of lignin is used as low-value burning fuel, and even considered as environmental pollutant in some circumstances. In this work, a family of the porous activated carbon (PAC) are synthesized utilizing alkali lignin as the precursor by carbonization-activation methods. The obtained PAC display high specific surface area (2923 m(2).g(-1)), large pore volume (1.51 cm(3).g(-1)), and interconnected micro-mesopore structure as well as rich surface heteroatom content (7.53-10.22 at.% oxygen, 1.17-2.29 at.% nitrogen, and 0.84-0.96 at.% sulfur). When used as adsorbent for volatile organic compound (VOC) removal, the PAC show outstanding adsorption capacity of dichloromethane (171 mg.g(-1)) and toluene (518 mg.g(-1)). The porous characteristics of PAC improved along with the fluctuation of the proportions of carbonization temperature, activation temperature, and lignin/KOH mass ratio. In addition, the correlation between adsorption properties and pore structure suggests that the dichloromethane and toluene adsorption capacity are determined by nanopores (0.5-1.0 nm) and micropores (< 2 nm) respectively. The Yoon and Nelson (Y-N) model of adsorption breakthrough curve reveals that PAC have the high adsorption rate k and fast mass transfer rate. The positive linear relationship (R-2 > 0.80) between the k and mesopore confirms that mesopores play the role of mass transfer channel.
      原文链接:
    • NSTL
    • Elsevier

    Simultaneous removal of mercury ions and cationic and anionic dyes from aqueous solution using epichlorohydrin cross-linked chitosan @ magnetic Fe3O4/activated carbon nanocomposite as an adsorbent

    Kaveh, ReyhanehBagherzadeh, Mojtaba
    21页
    查看更多>>摘要：An economical epichlorohydrin cross-linked chitosan @ magnetic Fe3O4/activated carbon nanocomposite, CH-EP@Fe3O4/AC, was successfully synthesized and used as a suitable adsorbent material for removal of a triphenylmethane cationic dye, Malachite green (MG), an anionic dye, Reactive red 120 (RR120), and Mercury ions (Hg2+) from aqueous solution. The prepared adsorbent has been characterized with Fourier transform infrared spectroscopy, X-ray diffraction, Scanning electron microscopy, Thermogravimetric analysis, Brunauer-Emmett-Teller analysis as well as Vibrating sample magnetometer. According to the result of Brunauer-Emmett-Teller isotherm, the prepared adsorbent has a specific surface area of 287 m(2)/g, which offers relatively high adsorption capacity for the dyes and heavy metal ions. The Box-Behnken design was employed to assist in the tuning of optimum adsorption conditions, such as dosage of adsorbent, solution pH and contact time. Under optimized conditions, kinetics results exhibited that the adsorption well fitted the pseudo-second-order model. The Langmuir isotherms fitted well with experimental data of Hg2+, MG and RR120 in single component solutions, which demonstrates adsorption is along with monolayer process. Also, the experimental data for adsorption of pollutants in binary and multicomponent solutions exhibited best fit with Freundlich model, which shows multilayer adsorption on the surface of the CH-EP@Fe3O4/AC adsorbent. The efficiency of removal towards Hg2+ ions in multicomponent solution (Hg2+/MG + RR120) exceeds 88% and the maximum adsorption capacity is 166.6 mg/g. In addition, the removal efficiency of towards MG in multicomponent solution (MG/RR120 + Hg2+) is about 81% with the maximum adsorption capacity of 146.3 mg/g and the removal efficiency and the maximum adsorption capacity of RR120 in that solution is 78% and 140.7 mg/g, respectively. Also, thermodynamic studies demonstrate that the adsorption of pollutants was spontaneous, that follow an endothermic way with an enhance in entropy. It was observed that the prepared adsorbent was stable after five runs of adsorption-desorption. Therefore, it was concluded that the prepared nanocomposite is a potential applicant for the adsorption of dyes and heavy metal ions from mixed aqueous solution.
      原文链接:
    • NSTL
    • Elsevier

    Remarkably boosting the lubricity of polyalphaolefin by loading amphiphilic carbon dots stabilized by Span-80

    Wang, BaogangZhang, LilongDai, ShanshanLu, Hongsheng...
    10页
    查看更多>>摘要：The amphiphilic carbon dots (A-CDs) derived from Tween-80 were used as the lubricant additives of polyalphaolefin (PAO4) with the aid of Span-80. The Span-80 (5.0 wt%) endowed A-CDs with super dispersibility in PAO4 by the hydrogen bond interactions between the hydrophilic head groups of Span-80 and the oxygen containing groups on A-CDs. At the load of 50 N, the biggest friction and wear reductions for PAO4 triggered by the A-CDs (1.3 wt%) stabilized by Span-80 (5.0 wt%) were 45.4 and 69.8%, respectively. The distinguished tribological performance of A-CDs stabilized by Span-80 illustrated the co-lubrication effect of Span-80 and A CDs. The wear scar surface analysis results revealed that the A-CDs stabilized by Span-80 distinctly alleviated the adhesive and abrasive wear of friction pair. The favorable smoothness and high O content on wear scar surface lubricated by A-CDs suspension reflected the A-CDs stabilized by Span-80 have participated in the formation of effective lubricating films. The reasonable lubrication mechanism of A-CDs stabilized by Span-80 was discussed based on the co-lubrication effect of Span-80 and A-CDs. The absorbing effect of Span-80 and the rolling and filling effects of A-CDs are all beneficial to the building of lubricating films, thereby tremendously boosting the lubricity of PAO4. The A-CDs stabilized by Span-80 are promising to become a kind of eco-friendly and highperformance lubricant additive for PAO.
      原文链接:
    • NSTL
    • Elsevier

    Highly stable fish-scale derived lamellar carbon for high performance supercapacitor application

    Zingare, Pooja A.Dhoble, Sanjay J.Deshmukh, Abhay D.
    8页
    查看更多>>摘要：Implementation of bio-waste as activated carbon precursor is the best strategy for preparation of low cost, ecofriendly and high performance supercapacitor electrode. Foregoing research work introduces simple physical activation for preparation of hierarchically porous activated carbon. The fish scale carbon shows enhanced specific capacitance of 195 Fg(-1) at 0.25 Ag-1 with high cyclic stability of 25,000 cycles at 4 Ag-1 followed by great capacitance retention. Additionally, two electrode pouch cell delivers maximum volumetric capacitance of 259 Fcm(-3) at specific capacitance of 88 Fg(-1) and shows excellent 100% capacitance retention over 10,000 cycles. Interestingly fabricated symmetric cell delivers highest energy density and power density of 15 Whkg(- 1) and 2200 Wkg(- 1) respectively. FSC exhibits attractive properties which are combination of plentiful porous structure, heteroatom self-doping and physicochemical stability, also in accordance of electrochemical performance fish scales are promising precursor for high performance carbon electrode material.
      原文链接:
    • NSTL
    • Elsevier

    The abrasion resistance of brazed diamond using Cu-Sn-Ti composite alloys reinforced with boron carbide

    Cui, BingZhao, WeixingZuo, RuzhongCheng, Yafang...
    10页
    查看更多>>摘要：Cu-Sn-Ti filler is commonly used in industrial production to prepare diamond tools. However, the hardness and strength of the Cu-based brazing filler metal are low, resulting in poor wear resistance of the brazing filler metal. In this work, novel brazed diamond segments were fabricated using Cu-Sn-Ti-xB4C composite fillers. The correlation between the interfacial compounds and friction and wear performance was studied. The results showed that after adding B4C with 2 wt%, B4C can react with the Cu-Sn-Ti filler, which moderates the wetting reaction between the active alloy and the diamond particles during brazing. The exposure of diamond was high and no obvious thermal damage occurred. The layered compounds is formed on the interface of the diamond; the SEM and XRD characterization prove that the compounds generated on the diamond surface is TiC. Vickers hardness tester was used to measure the microhardness of the fillers layer and the interface layer, and the hardness value of the filler layer gradually increased with the increase of B4C content. When the addition of B4C is 2%, the hardness value of the interfacial layer reaches 255 HV0.05. The friction and wear experiments results showed that when B4C was added at 2%, the wear material removal was 0.189 g and the wear resistance of the brazed specimens was optimal.
      原文链接:
    • NSTL
    • Elsevier

    Correlated Kelvin-probe force microscopy, micro-FTIR and micro-Raman analysis of doping anisotropy in multisectorial boron-doped HPHT diamonds

    Nikolenko, A. S.Strelchuk, V. V.Lytvyn, P. M.Danylenko, I. M....
    7页
    查看更多>>摘要：Boron-doped diamond single crystals of cubo-octahedral habit have been obtained by temperature gradient method at high pressures and high temperatures (HPHT) in Fe-Al-B-C system, and multisectoral plates of different orientations have been produced. Spatial distribution of uncompensated boron impurity and surface potential through the interfaces of different growth sectors of diamond plates have been studied by scanning Fourier transform infrared (FTIR) and Raman micro-spectroscopy, as well as scanning spreading resistance microscopy (SSRM) and Kelvin-probe force microscopy (KPFM). FTIR mapping showed strongly non-uniform growth-sector dependent distribution of uncompensated boron impurity gradually decreasing in a sequence {111}->{110}-> {113} -> {001} from ~7 . 10(18 )cm(-3) down to 2 . 10(17 )cm(-3). Micro-Raman mapping is used to reveal the submicron distribution of structural quality and boron content through the interfaces of different growth sectors. The inter-sectoral jumps of the surface potential in the axial and radial directions of the growth sectors were studied by KPFM, their theoretical estimates are obtained, and the features of the band structure of the inter-sector interfaces are revealed. A high level of structural perfection of inter-sectoral boundaries without electrically active defects is demonstrated.
      原文链接:
    • NSTL
    • Elsevier