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ACS applied materials & interfaces 92건

  1. [해외논문]   Rational Construction of Multivoids-Assembled Hybrid Nanospheres Based on VPO4 Encapsulated in Porous Carbon with Superior Lithium Storage Performance   SCI SCIE

    Zhao, Di , Meng, Tao , Qin, Jinwen , Wang, Wei , Yin, Zhigang , Cao, Minhua
    ACS applied materials & interfaces v.9 no.2 ,pp. 1437 - 1445 , 2017 , 1944-8244 ,

    초록

    The design of a new nanostructured anode material with high tap density while still keeping the common advantages of the hollow structure is a great challenge for future lithium-ion batteries (LIBs). Here, multivoids-assembled hierarchically meso-macroporous nanospheres based on VPO 4 encapsulated in porous carbon (MVHP-VPO 4 @C NSs) were designed and fabricated. This unique structure can evidently decrease the excessive interior space in hollow spheres or multishelled hollow spheres to gain high volumetric energy density and at the same time can alleviate the large mechanical strain during the cycling process. As expected, MVHP-VPO 4 @C NSs show good lithium storage behavior with gravimetric discharge capacity of 628 mAh g –1 after 100 cycles at a current density of 100 mA g –1 . Furthermore, the full cell (LiFePO 4 cathode//MVHP-VPO 4 @C NSs anode) also exhibits outstanding lithium storage performance. The insight obtained from this structure may provide guidance for the design of other electrode materials experiencing large volume variation during the lithiation–delithiation process. Graphic Abstract ACS Electronic Supporting Info

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  2. [해외논문]   High-Performance Solution-Processed Single-Junction Polymer Solar Cell Achievable by Post-Treatment of PEDOT:PSS Layer with Water-Containing Methanol   SCI SCIE

    Li, Weiping , Zhang, Xinliang , Zhang, Xin , Yao, Jiannian , Zhan, Chuanlang
    ACS applied materials & interfaces v.9 no.2 ,pp. 1446 - 1452 , 2017 , 1944-8244 ,

    초록

    PEDOT:PSS (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) is widely used as the hole-transporting layer for fabrication of new-generation solar cells. Herein, we utilize water-containing methanol to post-treat the PEDOT:PSS surface, by which the insulating PSS component is partially washed out with the PEDOT-to-PSS weight ratio increasing from 1:6.79 to 1:2.93. As a result, the surface becomes more covered with the electrically conductive PEDOT nanodomains, and again the mean current of the conductive nanodomains increases slightly from 6.68 to 7.28 pA, as demonstrated with conductive atomic force microscopy images. The electrical conductivity of the bulk PEDOT:PSS layer increases from 5.51 × 10 –4 to 4.04 × 10 –2 S/cm. The improvement in the surface conductivity allows for more efficient collection of mobile holes with a bit higher value of the hole mobility (5.56 vs 6.78 × 10 –4 cm 2 V –1 s –1 ). The solution-processed single-junction polymer solar cell fabricated on the treated PEDOT:PSS surface shows a higher mean short-circuit current-density (14.46 vs 16.48 mA cm –2 ) and, hence, a higher mean power conversion efficiency (8.23% vs 9.28%) than that on the untreated surface, as calculated from over 200 cells. Graphic Abstract ACS Electronic Supporting Info

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  3. [해외논문]   Sandwich-Like CNT@Fe3O4@C Coaxial Nanocables with Enhanced Lithium-Storage Capability   SCI SCIE

    Zhang, Yang , Tang, Yakun , Gao, Shasha , Jia, Dianzeng , Ma, Junhong , Liu, Lang
    ACS applied materials & interfaces v.9 no.2 ,pp. 1453 - 1458 , 2017 , 1944-8244 ,

    초록

    Through the combined method of a low-temperature reflux and calcination, porous sandwich-like CNT@Fe 3 O 4 @C coaxial nanocables were cleverly constructed, which exhibited a favorable specific capacity of 724.8 mA h g –1 at 1000 mA g –1 , a satisfying rate performance and admirable Coulombic efficiency (ca. 100%) for anodes of lithium-ion batteries. Due to the enlarged contact surface area, shortened Li + diffusion distance, hierarchical porosity, reasonable structural design and good structural stability, the electrochemical performance of the CNT@Fe 3 O 4 @C nanocomposites was greatly enhanced in comparison with the traditional iron oxide anodes. So, it is a good candidate for anode materials with high performance. Graphic Abstract ACS Electronic Supporting Info

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  4. [해외논문]   Photoelectrochemical Properties and Behavior of α-SnWO4 Photoanodes Synthesized by Hydrothermal Conversion of WO3 Films   SCI SCIE

    Zhu, Zhehao (Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, ) , Sarker, Pranab (Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, ) , Zhao, Chenqi (Materials Science and Engineering Graduate Program, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, ) , Zhou, Lite (Materials Science and Engineering Graduate Program, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, ) , Grimm, Ronald L. (Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, ) , Huda, Muhammad N. (Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, ) , Rao, Pratap M. (Materials Science and Engineering Graduate Program, Worcester Polytechnic Institute, Worcester, Massachusetts 01609,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1459 - 1470 , 2017 , 1944-8244 ,

    초록

    Metal oxides with moderate band gaps are desired for efficient production of hydrogen from sunlight and water via photoelectrochemical (PEC) water splitting. Here, we report an α-SnWO 4 photoanode synthesized by hydrothermal conversion of WO 3 films that achieves photon to current conversion at wavelengths up to 700 nm (1.78 eV). This photoanode is promising for overall PEC water-splitting because the flat-band potential and voltage of photocurrent onset are more negative than the potential of hydrogen evolution. Furthermore, the photoanode utilizes a large portion of the solar spectrum. However, the photocurrent density reaches only a small fraction of that which is theoretically possible. Density functional theory based thermodynamic and electronic structure calculations were performed to elucidate the nature and impact of defects in α-SnWO 4 prepared by this synthetic route, from which hole localization at Sn-at-W antisite defects was determined to be a likely cause for the poor photocurrent. Measurements further showed that the photocurrent decreases over time due to surface oxidation, which was suppressed by improving the kinetics of hole transfer at the semiconductor/electrolyte interface. Alternative synthetic methods and the addition of protective coatings and/or oxygen evolution catalysts are suggested to improve the PEC performance and stability of this promising α-SnWO 4 material. Graphic Abstract ACS Electronic Supporting Info

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  5. [해외논문]   Improved Surface Stability of C+MxOy@Na3V2(PO4)3 Prepared by Ultrasonic Method as Cathode for Sodium-Ion Batteries   SCI SCIE

    Klee, Rafael , Wiatrowski, Maciej , Aragó , n, Marí , a J. , Lavela, Pedro , Ortiz, Gregorio F. , Alcá , ntara, Ricardo , Tirado, José , L.
    ACS applied materials & interfaces v.9 no.2 ,pp. 1471 - 1478 , 2017 , 1944-8244 ,

    초록

    Coated C+M x O y @Na 3 V 2 (PO 4 ) 3 samples containing 1.5% or 3.5% wt. of M x O y (Al 2 O 3 , MgO or ZnO) have been synthesized by a two-step method including first a citric based sol–gel method for preparing the active material and second an ultrasonic stirring technique to deposit M x O y . The presence of the metal oxides properly coating the surface of the active material is evidenced by XPS and electron microscopy. Galvanostatic cycling of sodium half-cells reveals a significant capacity enhancement for samples coated with 1.5% of metal oxides and an exceptional cycling stability as evidenced by Coulombic efficiencies as high as 95.9% for ZnO@ Na 3 V 2 (PO 4 ) 3 . It is correlated to their low surface layer and charge transfer resistance values. The formation of metal fluorides that remove traces of corrosive HF from the electrolyte is checked by XPS spectroscopy. The feasibility of sodium-ion batteries assembled with C+M x O y @Na 3 V 2 (PO 4 ) 3 is further verified by evaluating the electrochemical performance of full cells. Particularly, a Graphite//Al 2 O 3 @ Na 3 V 2 (PO 4 ) 3 battery delivers an energy density as high as 260 W h kg –1 and exhibits a Coulombic efficiency of 89.3% after 115 cycles. Graphic Abstract ACS Electronic Supporting Info

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  6. [해외논문]   BiVO4/WO3/SnO2 Double-Heterojunction Photoanode with Enhanced Charge Separation and Visible-Transparency for Bias-Free Solar Water-Splitting with a Perovskite Solar Cell   SCI SCIE

    Baek, Ji Hyun (School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, ) , Kim, Byeong Jo (School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, ) , Han, Gill Sang (Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, ) , Hwang, Sung Won (Department of Materials Science & Engineering and Energy Systems Research, Ajou University, Suwon 443-749, ) , Kim, Dong Rip (School of Mechanical Engineering, Hanyang University, Seoul 133-791, ) , Cho, In Sun (Department of Materials Science & Engineering and Energy Systems Research, Ajou University, Suwon 443-749, ) , Jung, Hyun Suk (School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1479 - 1487 , 2017 , 1944-8244 ,

    초록

    Coupling dissimilar oxides in heterostruetures allows the engineering of interfacial, optical, charge separation/transport and transfer properties of photoanodes for photo electrochemical (PEC) water splitting. Here, we demonstrate a double-heterojunction concept based on a BiVO4/WO3/SnO2 triple-layer planar heterojunction (TPH) photoanode, which shows simultaneous improvements in the charge transport (similar to 93% at 1.23 V vs RHE) and transmittance at-longer wavelengths (>500 nm). The TPH photoanode was prepared by a facile solution method: a porous SnO2 film was, first deposited on a fluorine-doped tin oxide (FTO)/glass-substrate followed by WO3 deposition, leading to the formation of a double layer of dense WO3 and a WO3/SnO2 mixture at the bottom. Subsequently, a BiVO4 nanoparticle film was deposited by spin coating. Importantly, the WO3/(WO3+SnO2) composite bottom layer forms a disordered heterojunction enabling intimate contact, lower interfacial resistance, and efficient charge transport/transfer. In addition, the top BiVO4/WO3 heterojunction layer improves light absorption and charge separation. The resultant TPH photoanode shows greatly improved internal quantum efficiency (similar to 80%) and PEC water oxidation performance, (similar to 3.1 mA/cm(2) at 1.23 V vs RHE) compared to the previously reported BiVO4/WO3 photoanodes. The PEC performance was , further improved by a reactive-ion etching treatment and CoOx electrocatalyst deposition. Finally, we demonstrated a bias-free and stable solar water-splitting by constructing a tandem PEC device with a perovskite solar cell (STH similar to 3.5%).

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  7. [해외논문]   Coupling Molecularly Ultrathin Sheets of NiFe-Layered Double Hydroxide on NiCo2O4 Nanowire Arrays for Highly Efficient Overall Water-Splitting Activity   SCI SCIE

    Wang, Zhiqiang (College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, ) , Zeng, Sha (Suzhou Institute of Nanotech and Nanobionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industry Park, Suzhou 215123, ) , Liu, Weihong (College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, ) , Wang, Xingwang (College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, ) , Li, Qingwen (Suzhou Institute of Nanotech and Nanobionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industry Park, Suzhou 215123, ) , Zhao, Zhigang (Suzhou Institute of Nanotech and Nanobionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industry Park, Suzhou 215123, ) , Geng, Fengxia (College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1488 - 1495 , 2017 , 1944-8244 ,

    초록

    Developing efficient but nonprecious bifunctional electrocatalysts for overall water splitting in basic media has been the subject of intensive research focus with the increasing demand for clean and regenerated energy. Herein, we report on the synthesis of a novel hierarchical hybrid electrode, NiFe-layered double hydroxide molecularly ultrathin sheets grown on NiCo 2 O 4 nanowire arrays assembled from thin platelets with nickel foam as the scaffold support, in which the catalytic metal sites are more accessible and active and most importantly strong chemical coupling exists at the interface, enabling superior catalytic power toward both oxygen evolution reaction (OER) and additionally hydrogen evolution reaction (HER) in the same alkaline KOH electrolyte. The behavior ranks top-class compared with documented non-noble HER and OER electrocatalysts and even comparable to state-of-the-art noble-metal electrocatalysts, Pt and RuO 2 . When fabricated as an integrated alkaline water electrolyzer, the designed electrode can deliver a current density of 10 mA cm –2 at a fairly low cell voltage of 1.60 V, promising the material as efficient bifunctional catalysts toward whole cell water splitting. Graphic Abstract ACS Electronic Supporting Info

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  8. [해외논문]   Screw-Dislocation-Induced Strengthening–Toughening Mechanisms in Complex Layered Materials: The Case Study of Tobermorite   SCI SCIE

    Zhang, Ning (Unité) , Carrez, Philippe (Matériaux et Transformations, CNRS UMR8207, Bât. C6, Université) , Shahsavari, Rouzbeh (de Lille 1, Villeneuve d'Ascq 59655,)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1496 - 1506 , 2017 , 1944-8244 ,

    초록

    Nanoscale defects such as dislocations have a profound impact on the physics of crystalline materials. Understanding and characterizing the motion of screw dislocation and its corresponding effects on the mechanical properties of complex low-symmetry materials has long been a challenge. Herein, we focus on triclinic tobermorite, as a model system and a crystalline analogue of layered hydrated cement, and report for the first time how the motion of screw dislocation can influence the strengthening–toughening relationship, imparting brittle-to-ductile transitions. By applying shear loading in tobermorite systems with single and dipole screw dislocations, we observe dislocation jogs around the dislocation core, which increases the yield shear stress and the work-of-fracture when the dislocation lines are along the [100] and [010] directions. Our results demonstrate that the dislocation core acts as a bottleneck for the initial straight gliding to induce intralaminar gliding, which consequently leads to a significant improvement in the mechanical properties. Together, the fundamental knowledge gained in this work on the role of the motion of the dislocation core on the mechanical properties provides an improved understanding of deformation mechanisms in cementitious materials and other complex layered systems, providing new hypotheses and design guidelines for the development of strong, ductile, and tough materials. Graphic Abstract

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  9. [해외논문]   Are All-Solid-State Lithium-Ion Batteries Really Safe?–Verification by Differential Scanning Calorimetry with an All-Inclusive Microcell   SCI SCIE

    Inoue, Takao , Mukai, Kazuhiko
    ACS applied materials & interfaces v.9 no.2 ,pp. 1507 - 1515 , 2017 , 1944-8244 ,

    초록

    Although all-solid-state lithium-ion batteries (ALIBs) have been believed as the ultimate safe battery, their true character has been an enigma so far. In this paper, we developed an all-inclusive-microcell (AIM) for differential scanning calorimetry (DSC) analysis to clarify the degree of safety (DOS) of ALIBs. Here AIM possesses all the battery components to work as a battery by itself, and DOS is determined by the total heat generation ratio (Δ H ) of ALIB compared with the conventional LIB. When DOS = 100%, the safety of ALIB is exactly the same as that of LIB; when DOS = 0%, ALIB reaches the ultimate safety. We investigated two types of LIB-AIM and three types of ALIB-AIM. Surprisingly, all the ALIBs exhibit one or two exothermic peaks above 250 °C with 20–30% of DOS. The exothermic peak is attributed to the reaction between the released oxygen from the positive electrode and the Li metal in the negative electrode. Hence, ALIBs are found to be flammable as in the case of LIBs. We also attempted to improve the safety of ALIBs and succeeded in decreasing the DOS down to ∼16% by incorporating Ketjenblack into the positive electrode as an oxygen scavenger. Based on Δ H as a function of voltage window, a safety map for LIBs and ALIBs is proposed. Graphic Abstract ACS Electronic Supporting Info

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  10. [해외논문]   3D Reticular Li1.2Ni0.2Mn0.6O2 Cathode Material for Lithium-Ion Batteries   SCI SCIE

    Li, Li (School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, ) , Wang, Lecai (School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, ) , Zhang, Xiaoxiao (School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, ) , Xue, Qing (School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, ) , Wei, Lei (School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, ) , Wu, Feng (School of Materials Science & Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing 100081, ) , Chen, Renjie (School of Materials Science & Engineering, Bei)
    ACS applied materials & interfaces v.9 no.2 ,pp. 1516 - 1523 , 2017 , 1944-8244 ,

    초록

    In this study, a hard-templating route was developed to synthesize a 3D reticular Li 1.2 Ni 0.2 Mn 0.6 O 2 cathode material using ordered mesoporous silica as the hard template. The synthesized 3D reticular Li 1.2 Ni 0.2 Mn 0.6 O 2 microparticles consisted of two interlaced 3D nanonetworks and a mesopore channel system. When used as the cathode material in a lithium-ion battery, the as-synthesized 3D reticular Li 1.2 Ni 0.2 Mn 0.6 O 2 exhibited remarkably enhanced electrochemical performance, namely, superior rate capability and better cycling stability than those of its bulk counterpart. Specifically, a high discharge capacity of 195.6 mA h g –1 at 1 C with 95.6% capacity retention after 50 cycles was achieved with the 3D reticular Li 1.2 Ni 0.2 Mn 0.6 O 2 . A high discharge capacity of 135.7 mA h g –1 even at a high current of 1000 mA g –1 was also obtained. This excellent electrochemical performance of the 3D reticular Li 1.2 Ni 0.2 Mn 0.6 O 2 is attributed to its designed structure, which provided nanoscale lithium pathways, large specific surface area, good thermal and mechanical stability, and easy access to the material center. Graphic Abstract

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