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Li et al. [[3]] fabricated a CoFe SB 2 sb O SB 4 sb /g-C SB 3 sb N SB 4 sb composite catalyst with CoFe SB 2 sb O SB 4 sb particles supported on the flaky g-C SB 3 sb N SB 4 sb using a scalable facile method. However, currently, Li-S batteries suffer from low volumetric energy density and poor cycling stability due to the intrinsic low conductivity of sulfur and its discharge product, lithium polysulfide shuttle effect, and so on. Developing efficient and low-cost energy conversion and storage devices and technologies is all-important issue in order to achieve a low-carbon society, whose performance essentially depends on the properties of materials. Zhao et al. [[8]] designed a single-atom catalyst Au/WSSe by filling the single Au atom at the S vacancy site in the Janus WSSe monolayer. [Extracted from the article]

Atomically thin two-dimensional transition metal dichalcogenides (TMDCs) have been regarded as ideal and promising nanomaterials that bring broad application prospects in extensive fields due to their ultrathin layered structure, unique electronic band structure, and multiple spatial phase configurations. TMDCs with different phase structures exhibit great diversities in physical and chemical properties. By regulating the phase structure, their properties would be modified to broaden the application fields. In this mini review, focusing on the most widely concerned molybdenum dichalcogenides (MoX2: X = S, Se, Te), we summarized their phase structures and corresponding electronic properties. Particularly, the mechanisms of phase transformation are explained, and the common methods of phase regulation or phase stabilization strategies are systematically reviewed and discussed. We hope the review could provide guidance for the phase regulation of molybdenum dichalcogenides nanomaterials, and further promote their real industrial applications. [ABSTRACT FROM AUTHOR]

Hexagonal Ni0.25Co0.75(OH)2 nanoplates with rough and smooth surfaces have been synthesized with various amounts of CTAB by a mild wet chemical approach. The diameters of these two nanoplates are estimated to be ~150 nm and their thicknesses are ~30 nm. The electrochemical properties of the hexagonal nanoplates have also been investigated by using a three-electrode system under alkaline conditions. The scobinate Ni0.25Co0.75(OH)2 nanoplates show enhanced supercapacitor capacity compared with the smooth samples. For scobinate nanoplates, the specific capacitance is 306 F g−1 at a current density of 0.5 A g−1 and remains 90% as the current density increases 16 times. At a current density of 3 A g−1, the specific capacitance still remains 98% after 7000 cycles. [ABSTRACT FROM AUTHOR]

Nickel ferrite (NiFe2O4) nanomaterials with different morphologies, including nano-spheres (10–25 nm in diameter), nano-rods (50–60 nm in diameter and ~1 μm in length), and nano-octahedrons (side length ~150 nm), have been synthesized by a single mild hydrothermal method at 160 °C without any surfactant. The crystal structures have been investigated by TEM, HRTEM, and studied by simulations using the program Materials Studio. The variations in the morphology, as well as the preferential crystal growth directions, depend only on the pH value of the reaction solution. A phase formation mechanism is thus proposed. Magnetization measurements at T = 300 K indicate that the NiFe2O4 nano-spheres of 10–25 nm diameter are superparamagnetic with non-saturating magnetization at H = 7 kOe. The saturation magnetization, MS, of the nanorods is 40 emu g−1, less than the bulk value, MS = 46.7 to 55 emu g−1. The coercivity is HC = 40 Oe, reduced from the bulk value of 100 Oe. On the other hand, the nano-octahedrons have a saturation magnetization of MS = 50 emu g−1, the same as the bulk value. However the coercivity, HC = 50 Oe is also much reduced from the bulk value. [ABSTRACT FROM AUTHOR]

By the combination of graphene oxide with multiple "plug-ins", the composite membranes are fabricated for nanofiltration with high water permeance (82 L m−2h−1 bar−1) and ideal rejection rate (99.98%). [Display omitted] • The GO membranes contain the multiple "plug-ins" of β-CD and TMC. • The composite membranes exhibit high water permeance and ideal dye rejections. • The different effects of "plug-ins" on the nanofiltration performance are studied. The membranes based on graphene oxide (GO) have shown vast perspectives in nanofiltration, while the swelling of GO membranes in water environment poses a critical challenge for practical applications. In this study, we report the simple fabrication of stable GO membranes in water environment through intercalating multiple "plug-ins": the filter of β-cyclodextrin (β-CD) and the crosslinker of trimesoyl chloride (TMC), which can significantly enhance sieving effect and stability of membranes, and efficiently remove dyes and salts. The β-CD possess the cavity range of 6.0–6.5 Å which is larger than the diameter of water molecules, which can introduce extra water passage and hinder the permeation of dye molecules. In addition, the remaining hydroxyl groups on the membrane surface enhance the hydrophilicity, benefiting to enhance water permeance. At the same time, TMC cross-links β-CD and GO nanosheets to reinforce the membrane. The water permeance of the GO/β-CD/TMC membrane reaches 82 L m−2h−1 bar−1, and the dye rejection (crystal violet) is 99.98%. Therefore, GO membranes prepared by the multiple "plug-ins" incorporation strategy are promising candidates for the nanofiltration process to remove dyes. [ABSTRACT FROM AUTHOR]

ZnO nanorod arrays with peculiar morphologies were synthesized on (111)-oriented Si substrate and glass via a vapor phase growth. The morphology of the individual nanorod can be flat-headed bottle-like, and needle-like, which depends on the deposition positions relative to the source materials in the presence of a controlling element Se. In addition, the arrays of all the three morphologies exhibit good alignment and high coverage. This fabrication technique can be also used to direct the controllable growth of other nanomaterials with similar morphologies. [Copyright &y& Elsevier]

[Display omitted] • New 3D bulk MOF and 2D ultrathin MOF nanosheets are synthesized. • The planar micro-supercapacitors with the interdigital microelectrodes are achieved based on MOF bulk and MOF nanosheets. • The MOF-nanosheets for micro-supercapacitors displays enhanced performance than MOF bulk. Due to the advantages of ultrahigh power density, long lifespan and easy integration with wearable and microscale electronics, micro-supercapacitors (MSCs) have attracted great interest in recent years. However, new high-performance electrode materials for such micro-electrochemical energy storage devices require deep excavation. Herein, we precisely synthesized a new 3D bulk MOF and new 2D ultrathin MOF nanosheets with a thickness of less than 10 nm, and utilized them as high-capacitance microelectrode materials for sophisticated all-solid-state MSC devices respectively. Notably, the MSCs based on MOF nanosheets displayed a high areal capacitance of 28.3 mF·cm−2, and a volumetric capacitance of 15.7 F·cm−3 at 0.2 mA·cm−2. Especially, our MSCs exhibited remarkable energy density of 8.7 mWh·cm−3 at a power density of 110.3 mW·cm−3, and excellent cycling lifespans with retention of 96.0% after 10,000 cycles, and all performances are better than the MSCs based on MOF bulks. This work provides a new way to further explore the inherent advantages of MOFs and stimulates the synthesis of advanced MOFs materials for application in microscale energy storage. [ABSTRACT FROM AUTHOR]

Platinum-based nanomaterials have attracted much interest for their promising potentials in fields of energy-related and environmental catalysis. Designing and controlling the surface/interface structure of platinum-based nanomaterials at the atomic scale and understanding the structure-property relationship have great significance for optimizing the performances in practical catalytic applications. In this review, the strategies to obtain platinum-based catalysts with fantastic activity and great stability by composition regulation, shape control, three-dimension structure construction, and anchoring onto supports, are presented in detail. Moreover, the structure-property relationship of platinum-based nanomaterials are also exhibited, and a brief outlook are given on the challenges and possible solutions in future development of platinum-based nanomaterials towards catalytic reactions. [ABSTRACT FROM AUTHOR]